SELF-ALIGNED METAL OXIDE TFT WITH REDUCED NUMBER OF MASKS AND WITH REDUCED POWER CONSUMPTION

摘要

A method of fabricating MOTFTs includes positioning opaque gate metal on a transparent substrate, depositing gate dielectric material overlying the gate metal and a surrounding area, and depositing metal oxide semiconductor material thereon. Etch stop material is deposited on the semiconductor material. Photoresist defines an isolation area in the semiconductor material. Exposing the photoresist from the rear surface of the substrate and removing exposed portions to leave the etch stop material uncovered except for a portion overlying and aligned with the gate metal. Etching uncovered portions of the semiconductor material to isolate the TFT. Using the photoresist, selectively etching the etch stop layer to leave a portion overlying and aligned with the gate metal and defining a channel area in the semiconductor material. Depositing and patterning conductive material to form source and drain areas.