Nucleation of aluminum nitride on a silicon substrate using an ammonia preflow
First Claim
1. A method, performed in sequential order of manufacturing a semiconductor device, the method comprising:
- first step, providing a silicon substrate in a chamber;
second step, cleaning a surface of the silicon substrate with a flow of hydrogen in the chamber;
third step, flowing a first amount of ammonia in the chamber while the hydrogen is still flowing into the chamber, wherein the first amount of ammonia forms nitrogen-silicon bonds at the surface of the silicon substrate;
fourth step, flowing a first amount of trimethylaluminum (Al2(CH3)6) into the chamber while the hydrogen is still flowing into the chamber; and
fifth step, flowing a second amount of ammonia into the chamber, wherein the second amount of ammonia is greater than the first amount of ammonia by volume, and an initial AIN nuclear layer grows on the silicon substrate.
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Abstract
A silicon wafer used in manufacturing crystalline GaN for light emitting diodes (LEDs) includes a silicon substrate, a buffer layer of aluminum nitride (AlN) and an upper layer of GaN. The silicon wafer has a diameter of at least 200 millimeters and an Si(111)1×1 surface. The AlN buffer layer overlies the Si(111) surface. The GaN upper layer is disposed above the buffer layer. Across the entire wafer substantially no aluminum atoms of the AlN are present in a bottom most plane of atoms of the AlN, and across the entire wafer substantially only nitrogen atoms of the AlN are present in the bottom most plane of atoms of the AlN. A method of making the AlN buffer layer includes preflowing a first amount of ammonia equaling less than 0.01% by volume of hydrogen flowing through a chamber before flowing trimethylaluminum and then a subsequent amount of ammonia through the chamber.
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Citations
21 Claims
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1. A method, performed in sequential order of manufacturing a semiconductor device, the method comprising:
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first step, providing a silicon substrate in a chamber; second step, cleaning a surface of the silicon substrate with a flow of hydrogen in the chamber; third step, flowing a first amount of ammonia in the chamber while the hydrogen is still flowing into the chamber, wherein the first amount of ammonia forms nitrogen-silicon bonds at the surface of the silicon substrate; fourth step, flowing a first amount of trimethylaluminum (Al2(CH3)6) into the chamber while the hydrogen is still flowing into the chamber; and fifth step, flowing a second amount of ammonia into the chamber, wherein the second amount of ammonia is greater than the first amount of ammonia by volume, and an initial AIN nuclear layer grows on the silicon substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification