METHOD AND APPARATUS FOR PRODUCING SEMICONDUCTOR THIN FILM CRYSTAL

摘要

A method for producing a semiconductor thin film crystal which forms a semiconductor thin film by supplying gas onto a substrate, the method characterized by depositing an SiGe or Ge single crystal or polycrystal on the substrate using as a supply gas monosilane (SiH4), monogermane (GeH4) and fluorine (F2), and an inert gas that dilutes them, wherein the volume flow ratio of the monogermane relative to the monosilane is 0.005-1, the flow ratio of the fluorine is 0.5-4 in a volume flow ratio, the substrate temperature is 350-650°C, and the pressure is 13.3 Pa-1.33 kPa.