Patent ID: 8323402

Claim:
An aluminum nitride crystal growth method comprising: a step of preparing a laminar baseplate furnished with a starting substrate having a major surface and a back side on the reverse side from the major surface, a first layer formed on the back side, and a second layer formed on the first layer; and a step of growing aluminum nitride crystal onto the major surface of the starting substrate by vapor deposition; wherein the first layer is made of a substance that at the temperatures at which the aluminum nitride crystal is grown is less liable to sublimate than the starting substrate; the second layer is made of a substance whose thermal conductivity is higher than that of the first layer; the preparation step includes: a substep of arranging on the back side of the starting substrate a blend in which a powder and a solvent have been mixed together, and disposing the second layer onto the blend; and a substep of sintering the blend in order to make it into the first layer; and the solvent is made by mixing together acetone, formalin (formaldehyde), furfuryl alcohol, and a polyimide resin.