Patent ID: 6987036

Claim:
A method for forming a crystalline semiconductor film, comprising: depositing en amorphous semiconductor film comprising silicon over a substrate; performing an ozone water treatment for forming a ultra-thin oxide film on a surface of the amorphous semiconductor film; adding a catalyst element for accelerating a crystallization of the amorphous semiconductor film to the surface of the amorphous semiconductor film formed with the oxide film thereon; and performing a heat treatment to form a crystalline semiconductor film, wherein the method further comprises: calculating an ozone concentration of the ozone water; determining a wait time between the ozone water treatment step and the catalyst element addition step by substituting the ozone concentration in a relationship, wait time=240×exp(−0.86×ozone concentration); and providing a wait time at least not shorter than the calculated wait time between the ozone water treatment step and the catalyst element addition step.