HYBRID INTEGRATION FABRICATION OF NANOWIRE GATE-ALL-AROUND GE PFET AND POLYGONAL III-V PFET CMOS DEVICE

Abstract

The present invention provides a method of manufacturing nanowire semiconductor device. In the active region of the PMOS the first nanowire is formed with high hole mobility and in the active region of the NMOS the second nanowire is formed with high electron mobility to achieve the objective of improving the performance of nanowire semiconductor device.

Claims

1. A nanowire semiconductor device characterized in comprising: a substrate, said substrate including an active region of PMOS and an active region of NMOS; forming a first nanowire in the active region of PMOS; forming a second nanowire on the active region of NMOS; and completely surrounding the first nanowire and partially surrounding the second nanowire with gate dielectric layer and the gate electrode layer.

2. The nanowire semiconductor device according to claim 1, characterized in that the length of the first nanowire is in the range of between 2 nm to 50 nm, the diameter of said first nanowire is in the range of between 2 nm to 5 nanometers.

3. The nanowire semiconductor device according to claim 1, wherein the first nanowire is germanium nanowire, the shape of the section of said germanium nanowire is circular, oval or prism; said second nanowire is InGaAs nanowire, the cross-sectional shape of said second nanowire is polygon.

4. The nanowire semiconductor device according to claim 3, characterized in that the germanium content of the first nanowire is in the range of between 65% to 100%.

5. The nanowire semiconductor device according to claim 1, wherein said gate dielectric layer is a high-k gate dielectric layer, the material of said gate dielectric layer material is Al.sub.2O.sub.3 or TiSiO.sub.x. The gate electrode layer is a metal electrode layer, the material of said gate electrode layer is TiN, NiAu or one of CrAu.

6. A method for implementing a nanowire semiconductor device, the method comprising: providing a substrate, said substrate including an active region of PMOS and an active region of NMOS; forming a first nanowire in the active region of PMOS; forming a second nanowire on the active region of NMOS; and completely surrounding the first nanowire and partially surrounding the second nanowire with gate dielectric layer and the gate electrode layer.

7. The method for implementing nanowire semiconductor device according to claim 6, characterized in that the length of the first nanowire is in the range of between 2 nm to 50 nm, the diameter of said first nanowire is in the range of between 2 nm to 5 nanometers.

8. The method for implementing nanowire semiconductor device according to claim 6, wherein the first nanowire is germanium nanowire, the shape of the section of said germanium nanowire is circular, oval or prism; said second nanowire is InGaAs nanowire, the cross-sectional shape of said second nanowire is polygon.

9. The method for implementing nanowire semiconductor device according to claim 8, characterized in that the germanium content of the first nanowire is in the range of between 65% to 100%.

10. The method for implementing nanowire semiconductor device according to claim 6, wherein said gate dielectric layer is a high-k gate dielectric layer, the material of said gate dielectric layer material is Al.sub.2O.sub.3 or TiSiO.sub.x. The gate electrode layer is a metal electrode layer, the material of said gate electrode layer is TiN, NiAu or one of CrAu.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 is a flowchart for an embodiment of the present invention describing the processes of manufacturing a nanowire semiconductor device;

[0031] S10: providing a substrate, said substrate including active region of NMOS and PMOS;

[0032] S11: the first selective epitaxial growth process to form a first nanowire having a polygon structure on the NMOS active region;

[0033] S12: second selective epitaxial growth process to form a second nanowire having a polygon structure on the PMOS active region;

[0034] S13: removing a portion of the substrate through an etching process, such that the first nanowire is suspended above the substrate;

[0035] S14: oxidation annealing treatment of the first nanowire;

[0036] S15: in the substrate, sequentially forming on the first nanowire and the second nanowire the gate dielectric layer and the gate electrode layer.

[0037] FIGS. 2 to 12 are schematics of the processes of manufacturing a semiconductor nanowire device showing the structural views of an embodiment the present invention.

DETAILED DESCRIPTION

[0038] The following is a detail description with accompanying drawings of an embodiment of the present invention providing the method to manufacture a nanowire semiconductor device. The purposes of the following description are to highlight and clarify the advantages and features of the present invention. It should be noted that the drawings are used in a very simplified form and are using a non-precise proportion, only to facilitate and for the purpose of assisting lucid description of an embodiment of the present invention.

[0039] FIG. 1 is a flowchart for an embodiment of the present invention describing the method and procedures of manufacturing a nanowire semiconductor device, comprising:

[0040] S10: providing a substrate, said substrate including active regions of NMOS and PMOS;

[0041] S11: performing the first selective epitaxial growth process to form a polygon structure first nanowire in the active region of NMOS;

[0042] S12: performing the second selective epitaxial growth process to form a polygonal structure second nanowire on the active region of PMOS;

[0043] S13: removing a portion of the substrate through an etching process, such that the first nanowire is suspended above the substrate;

[0044] S14: oxidation and annealing treatment of the first nanowires;

[0045] S15: in the substrate, sequentially forming on the first nanowire and the second nanowire the gate dielectric layer and the gate electrode layer.

[0046] FIGS. 2 to 12 are schematics of the processes of manufacturing an embodiment the present invention a semiconductor nanowire device. FIGS. 2 to 12, in conjunction with FIG. 1, are detailed descriptions of the present invention of the method of manufacturing a nanowire semiconductor device:

[0047] firstly, as shown in FIG. 2, providing a substrate 210, said substrate 210 comprises patterned active region 210a of PMOS and active region 210b of NMOS;

[0048] subsequently, as shown in FIG. 3, an oxide layer is formed on the substrate 210 and the excessive oxide layer is removed using chemical mechanical polishing to form an isolation structure 220, and the top of the isolation structure 220 is substantially leveling with the top of the substrate 210.

[0049] Performing the first selective epitaxial growth process to form a polygon structure in the PMOS active region 210a the first nanowire 240. The processes of formation of a first nanowire 240 comprises:

[0050] step one: a first patterned hard mask layer 230 is formed on the substrate 210 and isolation structure 220, the first hard mask layer 230 having a first through hole 230a, the bottom of the first through hole 230a exposing a portion of the substrate 210 of the PMOS active region 210a;

[0051] step two: performing the first selective epitaxial growth process to form a first polygonal structure nanowire 240 on the exposed substrate 210 at the bottom of the first through hole 230a;

[0052] step three: removing the first hard mask layer 230.

[0053] After step one, as shown in FIG. 4, the first patterned hard mask layer 230 is formed on the substrate 210 and the isolation structure 220. A portion of the first hard mask layer 230 covering the active region 210a of PMOS is etched away to form a first through hole 230a. At the bottom of the first through hole 230a the substrate 210 is exposed.

[0054] As shown in FIG. 5, after the execution of step two, a polygonal first nanowire 240 is formed. The first nanowire 240 is in contact with the substrate 210 of the PMOS active region 210a.

[0055] Thereafter, a second selective epitaxial growth process is performed to form a second polygonal nanowire 260 in the active region 210b of NMOS. The processes of forming the second nanowire 260 comprising:

[0056] step one: forming a second patterned hard mask layer 250 on the substrate 210, the isolation structure 220 and the top of the first nanowire 240. At the bottom of the second through hole 250a of the second hard mask layer 250 a portion of the substrate 210 of NMOS active region 210b is exposed;

[0057] step two: wet etching the exposed substrate 210 at the bottom of the through hole 250a to form a recess 212 on the exposed substrate 210;

[0058] step three: the second selective epitaxial growth process is performed to form a second polygonal nanowire 260 growing from the recess 212;

[0059] step four: removing the second hard mask layer 250.

[0060] As shown in FIG. 6, after step one, on the substrate 210, the top of the isolation structure 220 and the first nanowire 240, a second patterned hard mask layer 250 is formed. A portion of the hard mask layer 250 located in the NMOS active region 210b is etched away to form a second through hole 250a. The substrate 210 is exposed at the bottom of the second through hole 250a.

[0061] As shown in FIG. 7, a recess 212 is formed by etching the substrate 210 exposed at the bottom of through hole 250a. Preferably, the cross-sectional shape of the recess 212 is V-shaped. The etching solution to use in the etching process is Tetra-Methyl-Ammonium-Hydroxide (TMAH) or KOH.

[0062] As shown in FIG. 8, after the execution of step three, in the V-shaped recess 212 a second polygonal element nanowire 260 is formed. The second nanowire 260 is in contact with substrate 210 of the active region 210b of NMOS.

[0063] Thereafter, a second etching is performed to remove a portion of the isolation structure 220 and the substrate 210 such that the first nanowire 240 is suspended above said substrate 210. The etching solution using in the etching process is Tetra-Methyl-Ammonium-Hydroxide (TMAH).

[0064] As shown in FIG. 9, after the second etching, the first nanowire 240 is suspended above the substrate 210, i.e., the first nanowire 240 is not in contact with the substrate 210.

[0065] Thereafter, the first nanowire 240 is treated with oxidation and annealing. The processes of oxidation and annealing of the first nanowires 240 include:

[0066] step one: thermal oxidizing the first nanowire 240;

[0067] step two: removing the surface oxide layer of the first nanowire 240 by a wet etching process;

[0068] step three: in a hydrogen environment, annealing the first nanowire 240 at high temperature.

[0069] As shown in FIG. 10, during the oxidation and the annealing treatment, germanium silicon is oxidation concentrated, so that the first nanowire 240 formed is a germanium nanowire. The oxidation and wet etching processes smooth the surface of germanium nanowire. After oxidation and annealing treatment, the cross-sectional shape of the polygonal first nanowire 240 (i.e., germanium nanowire) becomes round, elliptical or prismatic.

[0070] Finally, sequentially forming on the substrate 210, the first nanowire 240 and the second nanowire 260 the gate dielectric layer 270 and the gate electrode layer 280.

[0071] As shown in FIG. 11, forming a gate dielectric layer 270 on the substrate 210, isolation structure 220, the first nanowire 240 and the second nanowire 260. The gate dielectric layer 270 is overlying the substrate 210, the isolation structure surface 220, the first nanowires 240 and the second nanowire 260.

[0072] As shown in FIG. 12, a gate electrode layer 280 is formed on the gate dielectric layer 270. The gate electrode layer 280 completely surrounds the first nanowire 240, and surrounding most portion of the surface of the second nanowire 260.

[0073] The process of forming the gate dielectric layer 270 may be an atomic layer deposition (ALD) process, metal organic chemical vapor deposition (MOCVD) process, a chemical vapor deposition (CVD) process or other existing technology. The process of forming the gate electrode layer 280 may be an atomic layer deposition (ALD) process, metal organic chemical vapor deposition (MOCVD) process, molecular beam epitaxy (MBE) process or other existing technology.

[0074] Thus, a nanowire semiconductor device 200 is formed. Said semiconductor device 200 has a Ge nanowire formed in the active region 210a of the PMOS, an InGaAs nanowire in the active region 210b of NMOS. The germanium (Ge) nanowire has high hole mobility, and the indium gallium arsenide (InGaAs) nanowire has high electron mobility. The performance of the so formed nanowire semiconductor device 200 is significantly improved.

[0075] Nanowire formation is the key process in manufacturing nanowire semiconductor devices and is directly related to the performance of the nanowire semiconductor device. Existing process of making germanium nanowires typically includes: first, forming a nanowire having silicon nuclei; then followed by oxidation and annealing treatment to centralize germanium to facilitate the formation of a germanium nanowire. However, the kernel has much higher silicon content, this increases the difficulty of making nanowires with high germanium content. The performance of nanowire semiconductor devices is adversely affected by the nanowire made with low germanium content.

[0076] In this embodiment, the germanium nanowire is not formed with a silicon core. The nanowire is formed directly by epitaxial growth of germanium. The germanium nanowire is made following subsequent oxidation and annealing treatment. The nanowire thus formed has high Ge content.

[0077] Tests show that the first nanowire 240 of the nanowire semiconductor device 200 has germanium content in the range of between 65% to 100%, which is significantly higher than conventional germanium content of germanium nanowires (typically 50% or less). Thus, using of the method of the present invention to manufacture the nanowire semiconductor device effectively improves the device performance.

[0078] Here another embodiment of the present invention of a nanowire semiconductor device is provided. FIG. 12 is a schematic diagram of the structure of a nanowire semiconductor device. The nanowire semiconductor device comprising: a substrate 210, the substrate 210, including active region 210a of PMOS and active region 210b of NMOS; the first nanowire 240 is formed in the active region 210a of PMOS and the second nanowire 260 is formed in the active region 210b of NMOS; The gate dielectric layer 270 and gate electrode layer completely surrounds the first nanowire 240 and partially surrounds the second nanowire 260.

[0079] Specifically, the first nanowire 240 and the second nanowires 260 are grown from the substrate 210 of the PMOS active region 210a and the active region 210b of NMOS. The gate dielectric layer 270 is formed on the substrate 210, on the first nanowire 240 and the second nanowire 260. The gate electrode layer 280 is formed on the gate dielectric layer 270. The first nanowire 240 is completely surrounded by the gate dielectric layer 270 and the gate electrode layer 280. A portion of the second nanowire 260 in the region above the isolation structure 220 is also surrounded by the gate dielectric layer 270 and the gate electrode layer 280. Wherein said gate dielectric layer 270 is a high-k dielectric layer. For example, the material of the gate dielectric layer 270 is Al.sub.2O.sub.3 or TiSiO.sub.x. Using high k material for gate dielectric layer 270 improves the electrical properties of the nanowire semiconductor device. The gate electrode layer 280 is a metal electrode layer, the material of the gate electrode layer 280 is TiN, NiAu or one of CrAu.

[0080] The material of said first nanowire 240 and second nanowire 260 is group III-V semiconductor material. The Group III-V semiconductor materials include silicon, silicon germanium, germanium, or silicon carbide. Preferably, the material of the first nanowire 240 is germanium (Ge), the material of the second nanowire 260 is indium gallium arsenide (InGaAs).

[0081] The cross-sectional shape of the first nanowire 240 is circular. The cross-sectional shape of the second nanowire 260 is polygonal. Preferably, the polygonal second nanowire 260 has sides equal to or greater than five.

[0082] Preferably, the length of the first nanowire 240 is in the range of between 2 nm to 50 nm. The diameter of the first nanowire 240 is in the range of between 2 nm to 5 nm.

[0083] In summary, the present invention provides a method of manufacturing nanowire semiconductor device. In the active region of the PMOS the first nanowire is formed with high hole mobility and in the active region of the NMOS the second nanowire is formed with high electron mobility. This achieves the objective of improving the performance of nanowire semiconductor device.

[0084] While the present invention has been described in an illustrative manner, it should be understood that the terminology used is intended to be in a nature of words of description rather than of limitation. Many modifications and variations of the present invention and other versions are possible in light of the above teachings, and could be apparent for those skilled in the art. The above described embodiments of the present invention do not limit the present invention in any way. Any person skilled in the art, without departing from the technical scope of the present invention, can modify and vary technical solutions and technical content of the disclosed present invention. The modifications and variations still fall within the scope of the present invention.