【摘 要】
：
Photodetectors based on amorphous InGaZnO (a-IGZO) thin film transistor (TFT) and halide perovskites have attracted attention in recent years.However,such a sta
【机 构】
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State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai 2004
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Photodetectors based on amorphous InGaZnO (a-IGZO) thin film transistor (TFT) and halide perovskites have attracted attention in recent years.However,such a stack assembly of a halide perovskite layer/an a-IGZO channel,even with an organic semiconductor film inserted between them,easily has a very limited photoresponsivity.In this article,we investigate photoresponsive characteristics of TFTs by using CsPbX3 (X =Br or I) quantum dots (QDs) embedded into the a-IGZO channel,and attain a high photoresponsivity over 103A·W-1,an excellent detectivity in the order of 1016 Jones,and a light-to-dark current ratio up to 105 under visible lights.This should be mainly attributed to the improved transfer efficiency of photoelectrons from the QDs to the a-IGZO channel.Moreover,spectrally selective photodetection is demonstrated by introducing halide perovskite QDs with different bandgaps.Thus,this work provides a novel strategy of device structure optimization for significantly improving the photoresponsive characteristics of TFT photodetectors.
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