Patent ID: 7147718
Filing Date: 2006-12-12
Classification: C23C,C30B

Abstract:
1. A device for depositing in particular crystalline layers on one or more, in particular likewise crystalline substrates in a process chamber by means of reaction gases which are introduced into the process chamber where they react pyrolytically, the process chamber being disposed between a first wall and a second wall, which lies opposite the first, and the first wall forming at least one heated substrate holder and a gas admission element, which is a separate piece that extends through the second wall, a section of which gas admission element projects away from the second wall as far as approximately into the center between the two walls and by means of which gas admission element at least two reaction gases are fed into the process chamber spatially spaced apart from one another, characterized in that the gas admission element including the section which projects into the space between the two walls is cooled to a temperature which is lower than the decomposition temperature of the reaction gases, the gas admission element comprising a hollow portion, a base plate adjacent the hollow portion, a guide plate in the hollow portion and adjacent the base plate, and cooling-liquid supply and discharge passages that communicate a cooling liquid into the hollow portion between the guide plate and the base plate, over the base plate, and out of the hollow portion, the base plate having an outlet opening for a reaction gas and running parallel to the surface of the first wall.