Patent ID: 7244667
Filing Date: 2007-07-17
Classification: C23C,H01L

Abstract:
1. A method for the production of thin epitaxial semiconductor layers, characterized in that: a) there are provided a plurality of semiconductor substrates of a diameter of at least 150 mm and having surfaces to be coated, for simultaneous treatment in a low pressure batch reactor ( b) the surfaces to be coated of the semiconductor substrates are cleaned by a wet chemical process or in the gaseous phase or both, c) the cleaned semiconductor substrates are heated together in the low pressure batch reactor ( d) the semiconductor substrates are transferred together from the low pressure batch reactor ( e) the semiconductor substrates are heated in the low pressure hot or warm wall batch reactor ( f) the CVD process is effected under such conditions that deposition is controlled by surface reactions on the substrate and thus gas transport in the low pressure hot or warm wall batch reactor ( g) wherein the deposition of a semiconductor layer is controlled in such a way that deposition of a thin epitaxial semiconductor layer ends when the thin epitaxial semiconductor layer has reached a predetermined thickness of between 10 nm and 1000 nm.