Patent ID: 7824957

Claim:
A method for producing a semiconductor device, the semiconductor device including a structure formed on a substrate, the structure including a gate insulation layer disposed between a gate electrode and a semiconductor active layer, and a source electrode and a drain electrode formed to connect to the semiconductor active layer, the method comprising: a step of forming the semiconductor active layer, the step comprising: a first step of forming a ZnO film on the gate insulation film or on the substrate; a second step of applying an ultraviolet pulsed laser to substantially the entire ZnO film to change a specific resistance value of the ZnO film at a region exposed to the pulsed laser to 10 2 Ω·cm or less; and a third step of applying oxidation treatment to a portion of the region exposed to the pulsed laser, the portion including the active layer, to change the specific resistance value of the semiconductor active layer at the portion subjected to the oxidation treatment to 10 3 Ω·cm or more, the first to third steps being carried out in this order.