Patent ID: 7122444
Filing Date: 2006-10-17
Classification: H01L

Abstract:
1. A method of manufacturing a thin film device substrate; which comprising the steps of: forming, on a first substrate, a peeling-off film made of a porous film; forming a semiconductor film on said peeling-off film; forming a thin film device with said semiconductor film; bonding a second substrate onto said thin film device; and peeling off said first substrate at said peeling-off film, wherein the step of forming a peeling-off film on a first substrate comprises the steps of: forming, on said first substrate, a primary film in which said porous film is to be formed in a subsequent step; forming, in a film formed on said primary film, a large number of through holes to reach said primary film; and supplying an etchant from said through holes and thereby forming pores in said primary film.