Patent ID: 7829444
Filing Date: 2010-11-09
Classification: H01L

Abstract:
1. A method of manufacturing a field-effect transistor comprising: a first step of preparing a substrate; and a second step of forming on the substrate an insulating layer or an active layer comprising an amorphous oxide semiconductor comprising one element of at least In, Zn and Sn, (A) wherein the second step is conducted in an atmosphere of at least one of (i) ozone gas, (ii) nitrogen oxide gas, (iii) oxygen radical, (iv) elemental oxygen, (v) oxygen plasma, or (vi) oxygen ion, at an oxygen partial pressure sufficient to reduce electron carrier density of said amorphous oxide semiconductor to less than 1×10 (B) wherein after the second step is conducted to form the amorphous oxide semiconductor, oxygen partial pressure is controlled to reduce said electron carrier density to less than 1×10