MoS2/pentacene hybrid complementary inverter based photodetector with amplified voltage–output

Abstract

A sensitive photodetection based on a novel hybrid CMOS inverter has been demonstrated. Unlike common photo-current type photodetectors, which convert optical signals to current, the CMOS inverter realizes voltage-output, overcoming the difficulty to monitor current signal in the range ofnA. The hybrid CMOS logic inverter employs n-channel MoS(2)nanosheet/perovskite heterojunction FET and p-channel organic pentacene FET in a planar architecture. In order to obtain high performance, we adopt the interdigital electrodes for the pentacene FET to enhance the current density of the p-channel, and stack perovskite on the MoS(2)channel to modify the threshold voltage of the n-channel. As a result, a CMOS inverter with a voltage gain of more than ten is obtained. When V(IN)is around the transition voltage (-38 V), the inverter can obtain stable optical detection signal, the V(OUT)changes from 6 V in dark to 1 V under 633 nm light exposure. This finding indicates the potential to fabricate visible light detecting devices with voltage-output based on the inverter and may be further applicable for a photo-logic circuit.