Patent ID: 6812054
Filing Date: 2004-11-02
Classification: H01L

Abstract:
A method of fabricating a thin film transistor optical sensor, comprising the steps of:forming a first metal layer on a substrate, the first metal layer includes a sensor gate electrode, a switch gate electrode, and a first capacitor electrode; forming a first insulating layer on the first metal layer; forming an amorphous silicon layer and an etch stop layer on the first insulating layer, the etch stop layer disposed over the sensor gate electrode; forming a doped amorphous silicon layer to cover the amorphous silicon layer and the etch stop layer; forming a sensor silicon layer, a switch silicon layer, a sensor ohmic contact layer, and a switch ohmic contact layer from the doped amorphous silicon layer and the amorphous silicon layer; and forming a second metal layer to include a sensor source electrode, a sensor drain electrode, a switch source electrode, and a switch drain electrode.