Patent ID: 6806158
Filing Date: 2004-10-19
Classification: C30B,H01L

Abstract:
A mixed crystal layer growing method comprising the steps of:introducing source gases into the reaction chamber; and growing a silicon-germanium mixed crystal layer on a substrate placed in a reaction chamber, wherein the source gases include a silicon source gas, a germanium source gas, a first impurity source gas, and a second impurity source gas for inhibiting the diffusion or a first impurity in the mixed crystal layer, and the concentration of a second impurity is equal to or higher than the concentration of the first impurity in a region at any given depth of the silicon-germanium mixed crystal layer; wherein a supply timing from a supply source of the second impurity source gas is earlier than a supply timing from a supply source of the first impurity source gas, and a timing of stopping the supply from the supply source of the second impurity source gas is later than a timing of stopping the supply from the supply source of the first impurity source gas; and the timing of stopping the supply from the supply source of the first impurity source gas is the same as a timing of stopping a supply of the germanium source gas.