Patent ID: 9171942
Filing Date: 2015-10-27
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor element, the method comprising: a first step of forming a semiconductor film of which a principal constituent is an oxide semiconductor; after the first step, a second step of forming a first insulation film on a surface of the semiconductor film; after the second step, a third step of applying a heat treatment in an oxidizing atmosphere; and, after the third step, a fourth step of forming a second insulation film on a surface of the first insulation film, wherein, during the second step and the third step, a thickness of the first insulation film and a temperature of the heat treatment in the third step are adjusted such that, if the thickness of the first insulation film is represented by Z (nm), the heat treatment temperature is represented by T (° C.) and a diffusion distance of oxygen into the first insulation film and the semiconductor film is represented by L (nm), the relational expression 0<Z<L=8×10 further comprising, after the fourth step, a fifth step of applying a heat treatment in an oxidizing atmosphere at a lower temperature than the heat treatment temperature of the third step.