| 摘要 |
There are provided an oxide semiconductor material, capable of attaining stability of a threshold voltage (Vth) (threshold voltage shift amount &Dgr;Vth within a range of ±3 V in PDS and NBIS) and field-effect mobility of 5 cm2/Vs or more necessary for the operation of an OLED display device. An oxide semiconductor target in which an oxide semiconductor material with one or more of oxides of W, Ta, and Hf of 5d transition metal added each by 0.07 to 3.8 at %, 0.5 to 4.7 at %, and 0.32 to 6.4 at % to a semiconductor material with Zn—Sn—O as a main ingredient is sintered; a semiconductor channel layer formed by using the target, and an oxide semiconductor material for TFT protective film, as well as a semiconductor device having the same. |
