Vapor phase growth method
Provided is a vapor phase growth method according to an embodiment including loading a first substrate into a reaction chamber, generating a first mixed gas by mixing an indium containing gas, an aluminum containing gas, and a nitrogen compound containing gas, and forming a first indium aluminum nitride film on the first substrate by supplying the first mixed gas into the reaction chamber, the first substrate being rotated at a first rotation speed of 300 rpm or more.
1. A vapor phase growth method comprising:
loading a first substrate into a reaction chamber;
generating a first mixed gas by mixing at least a gallium containing gas and a nitrogen-compound containing gas;
forming a first gallium-containing nitride film after the loading the first substrate by supplying the first mixed gas into the reaction chamber, the first substrate being rotated at a first rotation speed of 300 rpm or more;
forming an aluminum nitride film or an aluminum gallium nitride film after the forming the first gallium-containing nitride film;
generating a second mixed gas by mixing an indium containing gas, an aluminum containing gas, and a nitrogen compound containing gas; and
forming a first indium aluminum nitride film after the forming the aluminum nitride film or the aluminum gallium nitride film by supplying the second mixed gas into the reaction chamber, the first substrate being rotated at a second rotation speed of 300 rpm or more, and the forming the first indium aluminum nitride film being continuously conducted without unloading the first substrate from the reaction chamber after the forming the first gallium-containing nitride film,
wherein a thickness of the aluminum nitride film or the aluminum gallium nitride film is smaller than a thickness of the first indium aluminum nitride film.
2. The vapor phase growth method according to claim 1 , wherein the reaction chamber is a reaction chamber for single wafer processing, and a rotation of the first substrate is self-rotation.
3. The vapor phase growth method according to claim 1 , further comprising:
unloading the first substrate from the reaction chamber after the forming the first indium aluminum nitride film;
loading a second substrate into the reaction chamber without cleaning the reaction chamber;
forming a second gallium-containing nitride film after the loading the second substrate by supplying the first mixed gas into the reaction chamber, the second substrate being rotated at the first rotation speed of 300 rpm or more; and
forming a second indium aluminum nitride film after the forming the second gallium-containing nitride film by supplying the second mixed gas into the reaction chamber, the second substrate being rotated at the second rotation speed of 300 rpm or more.
4. The vapor phase growth method according to claim 1 , wherein the nitrogen compound is ammonia.
5. The vapor phase growth method according to claim 1 , wherein the first substrate is a silicon substrate.
6. The vapor phase growth method according to claim 1 , wherein the aluminum nitride film or the aluminum gallium nitride film has a film thickness of 0.1 nm or more and 5 nm or less.
7. The vapor phase growth method according to claim 1 , wherein the second rotation speed is higher than the first rotation speed.
8. The vapor phase growth method according to claim 7 , wherein the second rotation speed is 1,600 rpm or more and the first rotation speed is 1,500 rpm or less.