Gate turn off capability of insulated gate metal/amorphous Si/crystalline Si (p-n) switching device

Abstract
The gate turn off capability of a trench insulated gate metal/amorphous silicon (a‐Si:H)/crystalline silicon (c‐Si) (pn) heterojunction switching device is studied. Using a negative gate voltage to modulate the depletion width in the a‐Si:H region, and hence lowering the field for the multiplication of carriers, the heterojunction switching device can be gate turned off or even gate locked. Thus the device can be developed as a gate controllable light switch or light sensor.