Development of high-speed quantum dots/graphene infrared detectors for uncooled infrared imaging

Judy Wu; Maogang Gong; Russell C. Schmitz; Bo Liu

doi:10.1117/12.2589813

15 April 2021 Development of high-speed quantum dots/graphene infrared detectors for uncooled infrared imaging

Judy Wu, Maogang Gong, Russell C. Schmitz, Bo Liu

Author Affiliations +

Proceedings Volume 11741, Infrared Technology and Applications XLVII; 117410F (2021) https://doi.org/10.1117/12.2589813
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Colloidal semiconductor quantum dots/graphene van der Waals (vdW) heterojunctions take advantages of the enhanced light-matter interaction and spectral tenability of quantum dots (QDs) and superior charge mobility in graphene, providing a promising alternative for uncooled infrared photodetectors with a gain or external quantum efficiency up to 1010. In these QD/graphene vdW heterostructures, the QD/graphene interface plays a critical role in controlling the optoelectronic process including exciton dissociation, charge injection and transport. Specifically, charge traps at the vdW interface can increase the noise, reduce the responsivity and response speed. This paper highlight our recent progress in engineering the vdW heterojunction interface towards more efficient charge transfer for higher photoresponsivity, D* and response speed. These results illustrate that the importance in vdW heterojunction interface engineering in QD/graphene photodetectors which may provide a promising pathway for low-cost, printable and flexible infrared detectors and imaging systems.

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Judy Wu, Maogang Gong, Russell C. Schmitz, and Bo Liu "Development of high-speed quantum dots/graphene infrared detectors for uncooled infrared imaging", Proc. SPIE 11741, Infrared Technology and Applications XLVII, 117410F (15 April 2021); https://doi.org/10.1117/12.2589813

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