Patent ID: 7098085
Filing Date: 2006-08-29
Classification: H01L

Abstract:
1. A thin semiconductor film formation method for forming a polycrystalline or monocrystalline thin semiconductor film on a substrate, the method comprising: a first step of forming a low-crystal-quality thin semiconductor film on the substrate; a second step of performing lamp annealing on the low-crystal-quality thin semiconductor film so as to melt the low-crystal-quality thin semiconductor film or heat the low-crystal-quality thin semiconductor film while maintaining the low-crystal-quality thin semiconductor film in a non-melted state and then cool the low-crystal-quality thin semiconductor film thereby enhancing crystallization of the low-crystal-quality thin semiconductor film; and a third step of forming a stepped recess with a predetermined shape and size in a particular area of the substrate where a device is to be formed, wherein the first step includes forming a low-crystal-quality thin semiconductor film, which may or may not include one or more kinds of catalytic elements, on the substrate having the stepped recess, and the second step includes performing a focused-light annealing process such that graphoepitaxy growth occurs from lower edges of the stepped recess acting as growth seeds thereby converting the low-crystal-quality thin semiconductor film into the monocrystalline thin semiconductor film.