High resistivity silicon-on-insulator substrate comprising a charge trapping layer formed on a substrate with a rough surface

Patent metadata

Field	Value
Publication number	US-10468294-B2
Application number	US-201716077142-A
Country	US
Kind code	B2
Filing date	Jan 31, 2017
Priority date	Feb 19, 2016
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A multilayer composite structure and a method of preparing a multilayer composite structure are provided. The multilayer composite structure comprises a semiconductor handle substrate having a minimum bulk region resistivity of at least about 500 ohm-cm and the front surface of the single crystal semiconductor handle substrate has a surface roughness of at least about 0.1 micrometers as measured according to the root mean square method over a surface area of at least 30 micrometers by 30 micrometers. The composite structure further comprises a charge trapping layer in contact with the front surface, the charge trapping layer comprising poly crystalline silicon, the poly crystalline silicon comprising grains having a plurality of crystal orientations; a dielectric layer in contact with the charge trapping layer; and a single crystal semiconductor device layer in contact with the dielectric layer.

First claim

What is claimed is:

1. A multilayer structure comprising:
a single crystal semiconductor handle substrate comprising two major, generally parallel surfaces, one of which is a roughened front surface of the single crystal semiconductor handle substrate and the other of which is a back surface of the single crystal semiconductor handle substrate, a circumferential edge joining the roughened front surface and the back surface of the single crystal semiconductor handle substrate, a central plane between the roughened front surface and the back surface of the single crystal semiconductor handle substrate, and a bulk region between the front and back surfaces of the single crystal semiconductor handle substrate, wherein the single crystal semiconductor handle substrate has a minimum bulk region resistivity of at least about 500 ohm-cm and the roughened front surface of the single crystal semiconductor handle substrate has a surface roughness of at least about 0.01 micrometers as measured according to the root mean square method over a surface area of at least 30 micrometers by 30 micrometers;
a charge trapping layer in contact with the roughened front surface single crystal semiconductor handle substrate, the charge trapping layer comprising polycrystalline silicon, the polycrystalline silicon comprising grains having a plurality of random crystal orientations and having a grain size between about 10 nanometers and about 3 micrometers;
a dielectric layer in contact with the charge trapping layer; and
a single crystal semiconductor device layer in contact with the dielectric layer.

2. The multilayer structure of claim 1 wherein the single crystal semiconductor handle substrate comprises single crystal silicon.

3. The multilayer structure of claim 1 wherein the single crystal semiconductor handle substrate comprises a single crystal silicon wafer sliced from a single crystal silicon ingot grown by the Czochralski method or the float zone method.

4. The multilayer structure of claim 1 wherein the single crystal semiconductor handle substrate has a bulk resistivity between about 1000 Ohm-cm and about 100,000 Ohm-cm.

5. The multilayer structure of claim 1 wherein the single crystal semiconductor handle substrate has a bulk resistivity between about 1000 ohm cm and about 10,000 Ohm-cm.

6. The multilayer structure of claim 1 wherein the single crystal semiconductor handle substrate has a bulk resistivity between about 2000 Ohm cm and about 10,000 Ohm-cm.

7. The multilayer structure of claim 1 wherein the single crystal semiconductor handle substrate has a bulk resistivity between about 3000 Ohm-cm and about 10,000 Ohm-cm.

8. The multilayer structure of claim 1 wherein the single crystal semiconductor handle substrate has a bulk resistivity between about 3000 Ohm cm and about 5,000 Ohm-cm.

9. The multilayer structure of claim 1 wherein the surface roughness of the roughened front surface of the single crystal semiconductor handle substrate is between about 0.1 micrometer and about 1 micrometer as measured according to the root mean square method over a surface area of at least 30 micrometers by 30 micrometers.

10. The multilayer structure of claim 1 wherein the plurality of crystal orientations of the polycrystalline silicon comprising grains comprise at least two orientations selected from the group consisting of (111), (100), and (110).

11. The multilayer structure of claim 1 wherein the dielectric layer comprises a material selected from the group consisting of silicon dioxide, silicon nitride, hafnium oxide, titanium oxide, zirconium oxide, lanthanum oxide, barium oxide, and a combination thereof.

12. The multilayer structure of claim 1 wherein the dielectric layer comprises a buried oxide layer having a thickness of at least about 10 nanometer.

13. The multilayer structure of claim 1 wherein the single crystal semiconductor device layer comprises single crystal silicon.

14. A method of forming a multilayer structure, the method comprising:
implanting ions selected from the group consisting of He + , H + , H 2 + , and any combination thereof through a front surface of a single crystal semiconductor handle substrate to thereby prepare an implant layer in a front surface region of the single crystal semiconductor handle substrate, wherein the single crystal semiconductor handle substrate comprises two major, generally parallel surfaces, one of which is the front surface of the single crystal semiconductor handle substrate and the other of which is a back surface of the single crystal semiconductor handle substrate, a circumferential edge joining the front and back surfaces of the single crystal semiconductor handle substrate, a central plane between the front surface and the back surface of the single crystal semiconductor handle substrate, a front surface region having a depth, D, as measured from the front surface and toward the central plane, and a bulk region between the front and back surfaces of the single crystal semiconductor handle substrate, wherein the single crystal semiconductor handle substrate has a minimum bulk region resistivity of at least about 500 ohm-cm;
heating the ion-implanted single crystal semiconductor handle substrate at a temperature and a duration sufficient to out-diffuse the implanted species and thereby form an agglomeration layer in the front surface region of the single crystal semiconductor handle substrate, the agglomeration layer forming at a depth, D1, as measured from the front surface and toward the central plane;
mechanically cleaving the single crystal semiconductor handle substrate at the agglomeration layer to thereby expose a roughened front surface of the single crystal semiconductor handle substrate, wherein the roughened front surface has a surface roughness of at least about 0.01 micrometers as measured according to the root mean square method over a surface area of at least 30 micrometers by 30 micrometers;
depositing a charge trapping layer on the roughened front surface, the charge trapping layer comprising polycrystalline silicon, the polycrystalline silicon comprising grains having a plurality of crystal orientations; and
bonding a dielectric layer on a front surface of a single crystal semiconductor donor substrate to the charge trapping layer to thereby form a bonded structure, wherein the single crystal semiconductor donor substrate comprises two major, generally parallel surfaces, one of which is the front surface of the semiconductor donor substrate and the other of which is a back surface of the semiconductor donor substrate, a circumferential edge joining the front and back surfaces of the semiconductor donor substrate, and a central plane between the front and back surfaces of the semiconductor donor substrate, and further wherein the front surface of the semiconductor donor substrate comprises the dielectric layer.

15. The method of claim 13 wherein the single crystal semiconductor handle substrate comprises single crystal silicon.

16. The method of claim 13 wherein the single crystal semiconductor handle substrate comprises a single crystal silicon wafer sliced from a single crystal silicon ingot grown by the Czochralski method or the float zone method.

17. The method of claim 13 wherein the single crystal semiconductor handle substrate has a bulk resistivity between about 1000 Ohm-cm and about 100,000 Ohm-cm.

18. The method of claim 13 wherein the single crystal semiconductor handle substrate has a bulk resistivity between about 1000 ohm cm and about 10,000 Ohm-cm.

19. The me

Assignees

• Sunedison Semiconductor Ltd
• Peidous Igor
• Globalwafers Co Ltd

Inventors

• Peidous Igor
• Jones Andrew M
• Kommu Srikanth
• Wang Gang
• Libbert Jeffrey L

Classifications

• H10P14/3411

  Silicon, silicon germanium or germanium · CPC title

• H10P14/3408

  Silicon carbide · CPC title

• H10P14/3211

  Silicon, silicon germanium or germanium · CPC title

• H10P14/24

  using chemical vapour deposition [CVD] · CPC title

• H10D64/01338

  with a treatment, e.g. annealing, after the formation of the conductor · CPC title