Patent ID: 8778730
Filing Date: 2014-07-15
Classification: H01L

Abstract:
1. A process for producing a circuit board that includes an oxide semiconductor layer, source wirings, and drain wirings, the process comprising: an oxide semiconductor formation step of forming an oxide semiconductor layer; a conductor layer formation step of forming a conductor layer by stacking a layer formed from a metal other than aluminum and a layer containing aluminum; and a treatment step of treating the layer containing aluminum by wet etching, and then treating the layer formed from a metal other than aluminum by dry etching, wherein the treatment step includes separating the conductor layer into source wirings and drain wirings such that portions of the source wirings in contact with the semiconductor layer and respective portions of the drain wirings in contact with the semiconductor layer spacedly face each other; and when treating the layer formed from a metal other than aluminum by dry etching, the dry etching is performed such that the oxide semiconductor layer is not substantially damaged or removed while the layer formed from a metal other than aluminum is etched.