US20140264640A1 - Semiconductor device and method for fabricating the same - Google Patents

Semiconductor device and method for fabricating the same Download PDF

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US20140264640A1
US20140264640A1 US13/846,169 US201313846169A US2014264640A1 US 20140264640 A1 US20140264640 A1 US 20140264640A1 US 201313846169 A US201313846169 A US 201313846169A US 2014264640 A1 US2014264640 A1 US 2014264640A1
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Prior art keywords
layer
metal layer
semiconductor device
conductive type
type metal
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US13/846,169
Inventor
Shin-Yu Nieh
Tieh-Chiang Wu
Wei-Ming Liao
Jei-Cheng Huang
Hai-Han Hung
Hsiu-Chun Lee
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Nanya Technology Corp
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Nanya Technology Corp
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Priority to US13/846,169 priority Critical patent/US20140264640A1/en
Assigned to NANYA TECHNOLOGY CORPORATION reassignment NANYA TECHNOLOGY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUANG, JEI-CHENG, HUNG, HAI-HAN, LEE, HSIU-CHUN, LIAO, Wei-ming, NIEH, SHIN-YU, WU, TIEH-CHIANG
Priority to TW102127219A priority patent/TWI553864B/en
Priority to CN201310588942.1A priority patent/CN104064572B/en
Publication of US20140264640A1 publication Critical patent/US20140264640A1/en
Priority to US15/199,413 priority patent/US9985105B2/en
Abandoned legal-status Critical Current

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    • H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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    • H01L21/28088—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon characterised by the conductor the final conductor layer next to the insulator being a composite, e.g. TiN
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    • H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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Definitions

  • the present disclosure relates to a semiconductor device, and in particular relates to a semiconductor device having a dual work function metal gate and method for fabricating the same.
  • CMOS complementary metal-oxide-semiconductor
  • V th threshold voltage
  • S/D doping reduction S/D doping reduction
  • halo implants etc.
  • the conventional methods have some drawbacks, for example, junction leakage is increased, drain current saturation (IDs) is increased, and junction capacitance is high.
  • Mid-gap materials having a work function of about 4.6 eV such as TiN, Ta, W
  • GIDL gate-induced drain leakage
  • V th threshold voltage
  • GDL gate-induced drain leakage
  • the invention provides a semiconductor device, comprising: a substrate; a U-shaped gate dielectric layer formed on the substrate; and a dual work function metal gate layer on the inner surface of U-shaped gate dielectric layer, wherein the dual work function metal gate layer comprises a first conductive type metal layer and a second conductive type metal layer.
  • the invention also provides a method for fabricating a semiconductor device, comprising: providing a substrate; forming a dummy gate on the substrate; forming an inter-layer dielectric layer (ILD) on the dummy gate and the substrate; performing a first chemical mechanical polishing (CMP) process to the inter-layer dielectric layer (ILD) to expose an upper surface of the dummy gate; forming a metal layer on the upper surface of the dummy gate; removing the dummy gate to form a trench in the inter-layer dielectric layer (ILD); conformally forming a gate dielectric layer in the trench; conformally forming a first conductive type metal layer on the gate dielectric layer; removing the first conductive type metal layer and the gate dielectric layer over the metal layer to form a gap in the inter-layer dielectric layer (ILD) and to expose a portion of the gate dielectric layer; filling a second conductive type metal layer in the gap, wherein the second conductive type metal layer is sandwiched between two first conductive type metal layers to
  • FIGS. 1A-1H show cross-sectional schematic representations of various stages of fabricating a semiconductor device in accordance with an embodiment of the invention.
  • the invention provides a semiconductor device having a dual work function metal gate structure.
  • FIGS. 1A-1H show cross-sectional schematic representations of various stages of fabricating a semiconductor device 100 in accordance with an embodiment of the invention.
  • a substrate 102 is provided, such as a silicon substrate.
  • the substrate 102 may alternatively include silicon germanium, gallium arsenic, or other suitable semiconductor materials.
  • the substrate 102 may further include other features such as various doped regions, a buried layer, and/or an epitaxy layer.
  • the substrate 102 may be a semiconductor on insulator such as silicon on insulator (SOI).
  • SOI silicon on insulator
  • the semiconductor substrate 102 may include a doped epi layer, a gradient semiconductor layer, and/or may further include a semiconductor layer overlying another semiconductor layer of a different type such as a silicon layer on a silicon germanium layer.
  • a compound semiconductor substrate may include a multilayer silicon structure or a silicon substrate may include a multilayer compound semiconductor structure.
  • an isolation structure such as a shallow trench isolation (STI) feature, may be formed in the substrate 102 for isolating an active region in the substrate, as is known in the art.
  • the isolation structure may be formed of silicon oxide, silicon nitride, silicon oxynitride, fluoride-doped silicate (FSG), and/or a low k dielectric material known in the art.
  • the dummy gate 104 may comprise a doped or undoped poly-crystalline silicon (or amorphous silicon), a metal (e.g., tantalum, titanium, molybdenum, tungsten, platinum, aluminum, hafnium, ruthenium), a metal silicide (e.g., titanium silicide, cobalt silicide, nickel silicide, tantalum silicide), a metal nitride (e.g., titanium nitride, tantalum nitride), other conductive materials or combinations thereof.
  • the dummy gate 104 is poly-silicon and may be formed by low-pressure chemical vapor deposition.
  • an inter-layer dielectric layer (ILD layer) 108 is formed on the substrate 102 and the dummy gate 104 .
  • the inter-layer dielectric layer 108 may be formed by atomic layer deposition (ALD), physical vapor deposition (PVD), chemical vapor deposition (CVD), or other acceptable methods for forming an ILD layer 108 .
  • the inter-layer dielectric layer 108 may comprise doped or undoped silicon oxide, although other materials such as silicon nitride doped silicate glass, high-k materials, combinations of these, or the like, may alternatively be utilized.
  • the spacers 106 may be formed on the substrate 102 and a sidewall of the dummy gate 104 .
  • the spacers 106 may be formed by blanket depositing one or more spacer layers (not shown) on the dummy gate 104 and the substrate 102 .
  • the spacers 106 may comprise SiN, oxynitride, SiC, SiON, oxide, and the like and may be formed by commonly used methods such as chemical vapor deposition (CVD), plasma enhanced CVD, sputter, and other methods known in the art. Note that in another embodiment, the spacers may not be formed.
  • the source/drain regions may be formed within the substrate 102 on opposing sides of the dummy gate 104 . Thus, the source/drain regions may be formed so as to define a channel region located beneath the dummy gate 104 .
  • a first chemical mechanical polishing (CMP) is performed to the inter-layer dielectric layer (ILD) 108 to expose an upper surface 104 a of the dummy gate 104 .
  • a metal layer 110 is formed on the upper surface 104 a of the dummy gate 104 .
  • the metal layer 110 may be a p + metal layer or n + metal layer.
  • the metal layer 110 may be formed by atomic layer deposition (ALD), physical vapor deposition (PVD), chemical vapor deposition (CVD), or other acceptable methods.
  • the metal layer 110 when the semiconductor device is an PMOS device, the metal layer 110 is an n + metal layer. In another embodiment, when the semiconductor device is NMOS device, the metal layer 110 is a p + metal layer.
  • the dummy gate 104 is removed to form a trench 120 in the inter-layer dielectric layer 108 , and the trench 120 has a depth of D1.
  • a gate dielectric layer 122 is conformally formed in the trench 120 .
  • the gate dielectric layer 122 may be formed by atomic layer deposition (ALD), chemical vapor deposition (CVD), or other acceptable methods.
  • the gate dielectric layer 122 has a thickness of about 5-70 ⁇ , preferably about 5-50 ⁇ .
  • the gate dielectric layer 122 comprises high-k dielectric material, such as HfO 2 , ZrO 2 , TiO 2 , Al 2 O 3 , HfSiO, HfSiON, HfTaO, HfSiO, HfZrO or combinations thereof.
  • a first conductive type metal layer 124 is conformally formed on the gate dielectric layer 122 .
  • the first conductive type metal layer 124 may be formed by atomic layer deposition (ALD), chemical vapor deposition (CVD), or other acceptable methods.
  • the first conductive type metal layer 124 has a thickness of about 4-20 nm, preferably about 4-10 nm.
  • the first conductive type metal layer 124 is an n + metal layer.
  • the first conductive type metal layer 124 is a p + metal layer.
  • the n + metal layer has a work function of about 4.1-4.9 and comprises scandium (Sc), zirconium (Zr), hafnium (Hf), aluminum (Al), titanium, (Ti), tantalum (Ta) or niobium (Nb).
  • the p + metal layer has a work function of about 4.7-5.0 and comprises tungsten (W), platinum (Pt), ruthenium (Ru), molybdenum (Mo), titanium rbide (TiC), zirconium arbide (ZrC), tantalum carbide (TaC), tungsten carbide (WC), titanium nitride (TiN), tantalum nitride (TaN) or ruthenium oxide (RuO).
  • the first conductive type metal layer 124 and the gate dielectric layer 122 over the metal layer 110 is removed to form a gap 125 in the inter-layer dielectric layer 108 and to expose a portion of the gate dielectric layer 122 .
  • the gate dielectric layer 122 has a U-shaped structure, and the U-shaped gate dielectric layer 122 comprises a horizontal portion 122 a and two vertical portions 122 b , and the two vertical portions 122 b are located at opposite ends of the horizontal portion 122 a .
  • Two first conductive type metal layers 124 are adjacent to the vertical portions 122 b of the U-shaped gate dielectric layer 122 .
  • An etching process such as a dry etching technique (e.g., anisotropic etching) may be performed on the first conductivity type metal layer 124 such that a portion of the first conductivity type metal layer 124 remains on the sidewalls of horizontal portion 122 a of the U-shaped gate dielectric layer 122 .
  • a dry etching technique e.g., anisotropic etching
  • the gap 125 has a width of D2, and the D1 of the trench 120 is larger than D2 of the gap 125 .
  • a second conductive type metal layer 126 is filled in the gap 125 , and thus the second conductive type metal layer 126 is sandwiched between two first conductive type metal layers 124 to form a dual work function metal gate layer 130 .
  • the semiconductor device when the semiconductor device is a PMOS device, the first conductive type metal layer 124 is an n + metal layer, and the second conductive type metal layer 126 is a p + metal layer.
  • the semiconductor device when the semiconductor device is an NMOS device, the first conductive type metal layer 124 is a p + metal layer, and the second conductive type metal layer 126 is an n + metal layer.
  • a second chemical mechanical polishing (CMP) is performed to the second conductive type metal layer 126 and the metal layer 110 to expose an upper surface of the dual work function metal gate layer 130 .
  • CMP chemical mechanical polishing
  • the invention also provides a semiconductor device 100 which comprises: a substrate 102 ; a U-shaped gate dielectric layer 122 formed on the substrate 102 ; and a dual work function metal gate layer 130 on the inner surface of U-shaped gate dielectric layer 122 , wherein the dual work function metal gate layer 130 comprises a first conductive type metal layer 124 and a second conductive type metal layer 126 .
  • the U-shaped gate dielectric layer 122 comprises a horizontal portion 122 a and two vertical portions 122 b , and the two vertical portions 122 b are located at opposite ends of the horizontal portion 122 a .
  • the dual work function metal gate layer 130 comprises two first conductive type metal layers 124 adjacent to the vertical portions 122 b of the U-shaped gate dielectric layer 122 and the second conductive type metal layer 126 sandwiched between two first conductive type metal layers 124 .
  • the semiconductor device is a PMOS device
  • the first conductive type metal layer 124 is an n + metal layer
  • the second conductive type metal layer 126 is a p + metal layer.
  • the p + metal layer sandwiched between two n + metal layers.
  • the middle p + metal layer has a higher work function
  • the dual work function metal gate layer 130 has a higher threshold voltage (V th ) for the p-channel below the middle p + metal layer.
  • V th threshold voltage
  • the n+ metal layer has a lower work function
  • the undesirably gate-induced drain leakage (GIDL) between the n+ metal layer and the drain is reduced.
  • the threshold voltage (Vth) is increased and the gate-induced drain leakage (GIDL) is reduced.

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Abstract

The invention provides a semiconductor device, including: a substrate; a U-shaped gate dielectric layer formed on the substrate; and a dual work function metal gate layer on the inner surface of U-shaped gate dielectric layer, wherein the dual work function metal gate layer includes a first conductive type metal layer and a second conductive type metal layer.

Description

    BACKGROUND OF THE DISCLOSURE
  • 1. Field of the Disclosure
  • The present disclosure relates to a semiconductor device, and in particular relates to a semiconductor device having a dual work function metal gate and method for fabricating the same.
  • 2. Description of the Related Art
  • In the course of the semiconductor integrated circuit (IC) evolution, functional density (i.e., the number of interconnected devices per chip area) has generally increased while geometry size (i.e., the component (or line) that can be created using a fabrication process) has decreased.
  • Specifically, as the dimension of the complementary metal-oxide-semiconductor (CMOS) devices decreases, short channel effect is increased. Thus, the threshold voltage (Vth) of CMOS devices is undesirably reduced.
  • There are several methods to increase the threshold voltage (Vth), such as more channel doping, S/D doping reduction, increase halo implants, etc. However, the conventional methods have some drawbacks, for example, junction leakage is increased, drain current saturation (IDs) is increased, and junction capacitance is high.
  • Mid-gap materials having a work function of about 4.6 eV (such as TiN, Ta, W) (near the mid-gap of silicon) may be used as the gate. However, the undesirably gate-induced drain leakage (GIDL) still exists.
  • Therefore, there is a need to develop a semiconductor device having a high threshold voltage (Vth) and a low gate-induced drain leakage (GIDL).
    • BRIEF SUMMARY OF THE DISCLOSURE
  • The invention provides a semiconductor device, comprising: a substrate; a U-shaped gate dielectric layer formed on the substrate; and a dual work function metal gate layer on the inner surface of U-shaped gate dielectric layer, wherein the dual work function metal gate layer comprises a first conductive type metal layer and a second conductive type metal layer.
  • The invention also provides a method for fabricating a semiconductor device, comprising: providing a substrate; forming a dummy gate on the substrate; forming an inter-layer dielectric layer (ILD) on the dummy gate and the substrate; performing a first chemical mechanical polishing (CMP) process to the inter-layer dielectric layer (ILD) to expose an upper surface of the dummy gate; forming a metal layer on the upper surface of the dummy gate; removing the dummy gate to form a trench in the inter-layer dielectric layer (ILD); conformally forming a gate dielectric layer in the trench; conformally forming a first conductive type metal layer on the gate dielectric layer; removing the first conductive type metal layer and the gate dielectric layer over the metal layer to form a gap in the inter-layer dielectric layer (ILD) and to expose a portion of the gate dielectric layer; filling a second conductive type metal layer in the gap, wherein the second conductive type metal layer is sandwiched between two first conductive type metal layers to form a dual work function metal gate layer; and performing a second chemical mechanical polishing (CMP) process to the second conductive type metal layer and the metal layer to expose an upper surface of the dual work function metal gate layer.
  • A detailed description is given in the following embodiments with reference to the accompanying drawings.
    • BRIEF DESCRIPTION OF THE DRAWING
  • For a more complete understanding of the present disclosure, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
  • FIGS. 1A-1H show cross-sectional schematic representations of various stages of fabricating a semiconductor device in accordance with an embodiment of the invention.
    •  DETAILED DESCRIPTION OF THE DISCLOSURE
  • The following description is of the best-contemplated mode of carrying out the disclosure. This description is made for the purpose of illustrating the general principles of the disclosure and should not be taken in a limiting sense. The scope of the disclosure is best determined by reference to the appended claims.
  • The invention provides a semiconductor device having a dual work function metal gate structure.
  • FIGS. 1A-1H show cross-sectional schematic representations of various stages of fabricating a semiconductor device 100 in accordance with an embodiment of the invention.
  • Referring to FIG. 1A, a substrate 102 is provided, such as a silicon substrate. The substrate 102 may alternatively include silicon germanium, gallium arsenic, or other suitable semiconductor materials. The substrate 102 may further include other features such as various doped regions, a buried layer, and/or an epitaxy layer. Furthermore, the substrate 102 may be a semiconductor on insulator such as silicon on insulator (SOI). In other embodiments, the semiconductor substrate 102 may include a doped epi layer, a gradient semiconductor layer, and/or may further include a semiconductor layer overlying another semiconductor layer of a different type such as a silicon layer on a silicon germanium layer. In other examples, a compound semiconductor substrate may include a multilayer silicon structure or a silicon substrate may include a multilayer compound semiconductor structure.
  • Additionally, an isolation structure (not shown) such as a shallow trench isolation (STI) feature, may be formed in the substrate 102 for isolating an active region in the substrate, as is known in the art. The isolation structure may be formed of silicon oxide, silicon nitride, silicon oxynitride, fluoride-doped silicate (FSG), and/or a low k dielectric material known in the art.
  • Then, a dummy gate 104 is formed on the substrate 102. The dummy gate 104 may comprise a doped or undoped poly-crystalline silicon (or amorphous silicon), a metal (e.g., tantalum, titanium, molybdenum, tungsten, platinum, aluminum, hafnium, ruthenium), a metal silicide (e.g., titanium silicide, cobalt silicide, nickel silicide, tantalum silicide), a metal nitride (e.g., titanium nitride, tantalum nitride), other conductive materials or combinations thereof. In an embodiment, the dummy gate 104 is poly-silicon and may be formed by low-pressure chemical vapor deposition.
  • Next, an inter-layer dielectric layer (ILD layer) 108 is formed on the substrate 102 and the dummy gate 104. The inter-layer dielectric layer 108 may be formed by atomic layer deposition (ALD), physical vapor deposition (PVD), chemical vapor deposition (CVD), or other acceptable methods for forming an ILD layer 108. The inter-layer dielectric layer 108 may comprise doped or undoped silicon oxide, although other materials such as silicon nitride doped silicate glass, high-k materials, combinations of these, or the like, may alternatively be utilized.
  • Additionally, before forming the inter-layer dielectric layer 108, the spacers 106 may be formed on the substrate 102 and a sidewall of the dummy gate 104. The spacers 106 may be formed by blanket depositing one or more spacer layers (not shown) on the dummy gate 104 and the substrate 102. The spacers 106 may comprise SiN, oxynitride, SiC, SiON, oxide, and the like and may be formed by commonly used methods such as chemical vapor deposition (CVD), plasma enhanced CVD, sputter, and other methods known in the art. Note that in another embodiment, the spacers may not be formed.
  • The source/drain regions (not shown in FIG. 1A) may be formed within the substrate 102 on opposing sides of the dummy gate 104. Thus, the source/drain regions may be formed so as to define a channel region located beneath the dummy gate 104.
  • Referring to FIG. 1A again, a first chemical mechanical polishing (CMP) is performed to the inter-layer dielectric layer (ILD) 108 to expose an upper surface 104 a of the dummy gate 104.
  • Referring to FIG. 1B, a metal layer 110 is formed on the upper surface 104 a of the dummy gate 104. The metal layer 110 may be a p+ metal layer or n+ metal layer. The metal layer 110 may be formed by atomic layer deposition (ALD), physical vapor deposition (PVD), chemical vapor deposition (CVD), or other acceptable methods.
  • In one embodiment, when the semiconductor device is an PMOS device, the metal layer 110 is an n+ metal layer. In another embodiment, when the semiconductor device is NMOS device, the metal layer 110 is a p+ metal layer.
  • Referring to FIG. 1C, the dummy gate 104 is removed to form a trench 120 in the inter-layer dielectric layer 108, and the trench 120 has a depth of D1.
  • Referring to FIG. 1D, a gate dielectric layer 122 is conformally formed in the trench 120. The gate dielectric layer 122 may be formed by atomic layer deposition (ALD), chemical vapor deposition (CVD), or other acceptable methods. The gate dielectric layer 122 has a thickness of about 5-70 Å, preferably about 5-50 Å.
  • Additionally, the gate dielectric layer 122 comprises high-k dielectric material, such as HfO2, ZrO2, TiO2, Al2O3, HfSiO, HfSiON, HfTaO, HfSiO, HfZrO or combinations thereof.
  • Referring to FIG. 1E, a first conductive type metal layer 124 is conformally formed on the gate dielectric layer 122. The first conductive type metal layer 124 may be formed by atomic layer deposition (ALD), chemical vapor deposition (CVD), or other acceptable methods. The first conductive type metal layer 124 has a thickness of about 4-20 nm, preferably about 4-10 nm.
  • In one embodiment, when the semiconductor device is a PMOS device, the first conductive type metal layer 124 is an n+ metal layer.
  • In another embodiment, when the semiconductor device is NMOS device, the first conductive type metal layer 124 is a p+ metal layer.
  • The n+ metal layer has a work function of about 4.1-4.9 and comprises scandium (Sc), zirconium (Zr), hafnium (Hf), aluminum (Al), titanium, (Ti), tantalum (Ta) or niobium (Nb).
  • The p+ metal layer has a work function of about 4.7-5.0 and comprises tungsten (W), platinum (Pt), ruthenium (Ru), molybdenum (Mo), titanium rbide (TiC), zirconium arbide (ZrC), tantalum carbide (TaC), tungsten carbide (WC), titanium nitride (TiN), tantalum nitride (TaN) or ruthenium oxide (RuO).
  • Referring to FIG. 1E, the first conductive type metal layer 124 and the gate dielectric layer 122 over the metal layer 110 is removed to form a gap 125 in the inter-layer dielectric layer 108 and to expose a portion of the gate dielectric layer 122.
  • Note that after the above removing step, the gate dielectric layer 122 has a U-shaped structure, and the U-shaped gate dielectric layer 122 comprises a horizontal portion 122 a and two vertical portions 122 b, and the two vertical portions 122 b are located at opposite ends of the horizontal portion 122 a. Two first conductive type metal layers 124 are adjacent to the vertical portions 122 b of the U-shaped gate dielectric layer 122.
  • An etching process such as a dry etching technique (e.g., anisotropic etching) may be performed on the first conductivity type metal layer 124 such that a portion of the first conductivity type metal layer 124 remains on the sidewalls of horizontal portion 122 a of the U-shaped gate dielectric layer 122.
  • The gap 125 has a width of D2, and the D1 of the trench 120 is larger than D2 of the gap 125.
  • Referring to FIG. 1G, a second conductive type metal layer 126 is filled in the gap 125, and thus the second conductive type metal layer 126 is sandwiched between two first conductive type metal layers 124 to form a dual work function metal gate layer 130.
  • In one embodiment, when the semiconductor device is a PMOS device, the first conductive type metal layer 124 is an n+ metal layer, and the second conductive type metal layer 126 is a p+ metal layer.
  • In another embodiment, when the semiconductor device is an NMOS device, the first conductive type metal layer 124 is a p+ metal layer, and the second conductive type metal layer 126 is an n+ metal layer.
  • Referring to FIG. 1H, a second chemical mechanical polishing (CMP) is performed to the second conductive type metal layer 126 and the metal layer 110 to expose an upper surface of the dual work function metal gate layer 130. Thus, a semiconductor device 100 having the dual work function metal gate layer 130 is formed by the above-mentioned steps.
  • As shown in FIG. 1H, the invention also provides a semiconductor device 100 which comprises: a substrate 102; a U-shaped gate dielectric layer 122 formed on the substrate 102; and a dual work function metal gate layer 130 on the inner surface of U-shaped gate dielectric layer 122, wherein the dual work function metal gate layer 130 comprises a first conductive type metal layer 124 and a second conductive type metal layer 126.
  • The U-shaped gate dielectric layer 122 comprises a horizontal portion 122 a and two vertical portions 122 b, and the two vertical portions 122 b are located at opposite ends of the horizontal portion 122 a. Additionally, the dual work function metal gate layer 130 comprises two first conductive type metal layers 124 adjacent to the vertical portions 122 b of the U-shaped gate dielectric layer 122 and the second conductive type metal layer 126 sandwiched between two first conductive type metal layers 124.
  • For example, when the semiconductor device is a PMOS device, the first conductive type metal layer 124 is an n+ metal layer, and the second conductive type metal layer 126 is a p+ metal layer. In other words, the p+ metal layer sandwiched between two n+ metal layers. Because the middle p+ metal layer has a higher work function, the dual work function metal gate layer 130 has a higher threshold voltage (Vth) for the p-channel below the middle p+ metal layer. Because the n+ metal layer has a lower work function, the undesirably gate-induced drain leakage (GIDL) between the n+ metal layer and the drain (not shown in figures) is reduced.
  • From the above description, compared with the single work function metal gate in prior art, due to the dual work function metal gate layer of the invention having two different work functions, the threshold voltage (Vth) is increased and the gate-induced drain leakage (GIDL) is reduced.
  • While the disclosure has been described by way of example and in terms of the preferred embodiments, it is to be understood that the disclosure is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.

Claims (22)

What is claimed is:
1. A semiconductor device, comprising:
a substrate;
a U-shaped gate dielectric layer formed on the substrate; and
a dual work function metal gate layer on the inner surface of U-shaped gate dielectric layer, wherein the dual work function metal gate layer comprises a first conductive type metal layer and a second conductive type metal layer.
2. The semiconductor device as claimed in claim 1, wherein the U-shaped gate dielectric layer comprises a horizontal portion and two vertical portions, and the two vertical portions are located at opposite ends of the horizontal portion.
3. The semiconductor device as claimed in claim 2, wherein the dual work function metal gate layer comprises:
two first conductive type metal layers adjacent to the vertical portions of the U-shaped gate dielectric layer; and
the second conductive type metal layer sandwiched between two first conductive type metal layers.
4. The semiconductor device as claimed in claim 1, wherein the first conductive type metal layer is a p+ metal layer and the second conductive type metal layer is an n+ metal layer.
5. The semiconductor device as claimed in claim 1, wherein the first conductive type metal layer is an n+ metal layer and the second conductive type metal layer is a p+ metal layer.
6. The semiconductor device as claimed in claim 1, wherein the n+ metal layer has a work function of about 4.1-4.9.
7. The semiconductor device as claimed in claim 5, wherein the n+ metal layer comprises scandium (Sc), zirconium (Zr), hafnium (Hf), aluminum (Al), titanium, (Ti), tantalum (Ta) or niobium (Nb).
8. The semiconductor device as claimed in claim 5, wherein the p+ metal layer has a work function of about 4.7-5.0.
9. The semiconductor device as claimed in claim 5, wherein the p+ metal layer comprises tungsten (W), platinum (Pt), ruthenium (Ru), molybdenum (Mo), titanium carbide (TiC), zirconium arbide (ZrC), tantalum carbide (TaC), tungsten carbide (WC), titanium nitride (TiN), tantalum nitride (TaN) or ruthenium oxide (RuO).
10. The semiconductor device as claimed in claim 1, wherein the U-shaped gate dielectric layer comprises high-k dielectric material.
11. The semiconductor device as claimed in claim 10, wherein the high-k dielectric material comprises HfO2, ZrO2, TiO2, Al2O3, HfSiO, HfSiON, HfTaO, HfSiO, HfZrO or combinations thereof.
12. The semiconductor device as claimed in claim 1, further comprising:
an inter-layer dielectric layer (ILD) formed on the substrate and on a sidewall of the dual work function metal gate layer.
13. The semiconductor device as claimed in claim 12, further comprising:
a spacer formed on the substrate, wherein the spacer is formed between the inter-layer dielectric layer (ILD) and the dual work function metal gate layer.
14. A method for fabricating a semiconductor device, comprising:
providing a substrate;
forming a dummy gate on the substrate;
forming an inter-layer dielectric layer (ILD) on the dummy gate and the substrate;
performing a first chemical mechanical polishing (CMP) process to the inter-layer dielectric layer (ILD) to expose an upper surface of the dummy gate;
forming a metal layer on the upper surface of the dummy gate;
removing the dummy gate to form a trench in the inter-layer dielectric layer (ILD);
conformally forming a gate dielectric layer in the trench;
conformally forming a first conductive type metal layer on the gate dielectric layer;
removing the first conductive type metal layer and the gate dielectric layer over the metal layer to form a gap in the inter-layer dielectric layer (ILD) and to expose a portion of the gate dielectric layer;
filling a second conductive type metal layer in the gap, wherein the second conductive type metal layer is sandwiched between two first conductive type metal layers to form a dual work function metal gate layer; and
performing a second chemical mechanical polishing (CMP) process to the second conductive type metal layer and the metal layer to expose an upper surface of the dual work function metal gate layer.
15. The method for fabricating a semiconductor device as claimed in claim 14, before forming the inter-layer dielectric layer (ILD) on the dummy gate and the substrate, further comprising:
forming a spacer on a sidewall of the dummy gate.
16. The method for fabricating a semiconductor device as claimed in claim 14, wherein the metal layer comprises p+ metal layer or n+ metal layer.
17. The method for fabricating a semiconductor device as claimed in claim 14, after removing the first conductive type metal layer and the gate dielectric layer over the metal layer, wherein the gate dielectric layer has a U-shaped structure, and the U-shaped gate dielectric layer comprises a horizontal portion and two vertical portions, and the two vertical portions are located at opposite ends of the horizontal portion.
18. The method for fabricating a semiconductor device as claimed in claim 17, wherein two first conductive type metal layers are adjacent to the vertical portions of the U-shaped gate dielectric layer.
19. The method for fabricating a semiconductor device as claimed in claim 14, wherein the gate dielectric layer comprises high-k dielectric material.
20. The method for fabricating a semiconductor device as claimed in claim 14, wherein the first conductive type metal layer is a p+ metal layer and the second conductive type metal layer is an n+ metal layer.
21. The method for fabricating a semiconductor device as claimed in claim 14, wherein the first conductive type metal layer is an n+ metal layer and the second conductive type metal layer is a p+ metal layer.
22. The method for fabricating a semiconductor device as claimed in claim 14, wherein a width of the trench is larger than that of the gap.
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