| 摘要 |
Provided is a back-channel etch type thin-film transistor (TFT) without an etch stopper layer, wherein an oxide semiconductor of the TFT has excellent resistance to an acid etchant and stress stability. The oxide semiconductor layer is a laminate having a first layer comprising tin, indium, and gallium or zinc, and oxygen, and a second layer comprising one or more elements selected from a group consisting indium, zinc, tin and gallium; and oxygen. The TFT is formed, in the following order, a gate insulator film, the second semiconductor layer and the first semiconductor layer; and having a value in a cross section in the lamination direction of the TFT, as determined by [100×(the first layer thickness of directly below a source-drain electrode end−a center portion thickness of the first layer)/the first layer thickness of directly below the source-drain electrode end], of not more than 5%. |
