Hwang, Do Kyung Lee, Young Tack Lee, Hee Sung Lee, Yun Jae Shokouh, Seyed Hossein Kyhm, Ji-Hoon Lee, Junyeong Kim, Hong Hee Yoo, Tae-Hee Nam, Seung Hee Son, Dong Ick Ju, Byeong-Kwon Park, Min-Chul Song, Jin Dong Choi, Won Kook Im, Seongil 2024-01-20T05:30:21Z 2024-01-20T05:30:21Z 2021-09-03 2016-01 1884-4049 https://pubs.kist.re.kr/handle/201004/124591 Lead sulfide (PbS) quantum dots (QDs) have great potential in optoelectronic applications because of their desirable characteristics as a light absorber for near-infrared (NIR) photodetection. However, most PbS-based NIR photodetectors are two-terminal devices, which require an integrated pixel circuit to be practical photosensors. Here we report on PbS QD/indium gallium zinc oxide (InGaZnO, IGZO) metal oxide semiconductor hybrid phototransistors with a photodetection capability between 700 and 1400 nm, a range that neither conventional Si nor InGaAs photodetectors can cover. The new hybrid phototransistor exhibits excellent photoresponsivity of over 106 A W−1 and a specific detectivity in the order of 1013 Jones for NIR (1000 nm) light. Furthermore, we demonstrate an NIR (1300 nm) imager using photogating inverter pixels based on PbS/IGZO phototransistors at an imaging frequency of 1 Hz with a high output voltage photogain of ~4.9 V (~99%). To the best of our knowledge, this report demonstrates the first QD/metal oxide hybrid phototransistor-based flat panel NIR imager. Our hybrid approach using QD/metal oxide paves the way for the development of gate-tunable and highly sensitive flat panel NIR sensors/imagers that can be easily integrated. English NATURE PUBLISHING GROUP Ultrasensitive PbS quantum-dot-sensitized InGaZnO hybrid photoinverter for near-infrared detection and imaging with high photogain Article 10.1038/am.2015.137 1 NPG ASIA MATERIALS, v.8 NPG ASIA MATERIALS 8 N scie scopus 000368583000001 2-s2.0-85017569090 Materials Science, Multidisciplinary Materials Science Article THIN-FILM TRANSISTORS CHARGE-TRANSFER TRANSPARENT PHOTOTRANSISTORS PHOTODETECTORS GRAPHENE PHOTOCONDUCTIVITY PHOTOVOLTAICS PERFORMANCE TRANSPORT PbS quantum dot InGaZnO Semiconductor Hybrid Phototransistor Photo Inverter Near Infrared Detection/Imaging