Exploration of uncooled quantum infrared detectors based on quantum dots/graphene heterostructures

Judy Z. Wu

doi:10.1117/12.2556930

23 April 2020 Exploration of uncooled quantum infrared detectors based on quantum dots/graphene heterostructures

Judy Z. Wu

Proceedings Volume 11407, Infrared Technology and Applications XLVI; 1140706 (2020) https://doi.org/10.1117/12.2556930
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

Heterojunction nanohybrids based on low-dimension semiconductors, including colloidal quantum dots (QDs) and 2D atomic materials (graphene, transition metal chalcogenides, etc) provide a fascinating platform to design of new photonic and optoelectronic devices that take advantages of the enhanced light-solid interaction attributed to their strong quantum confinement and superior charge mobility for uncooled photodetectors with a high gain up to 1010. In these heterojunction nanohybrids, the van der Waals (vdW) interface plays a critical role in controlling the optoelectronic process including exciton dissociation by the interface built-in field that drives the follow-up charge injection and transport to graphene. In this paper, we present our recent progress in development of such heterostructures nanohybrids for uncooled infrared detectors including PbS and FeS₂ QDs/graphene and 2D vdW heterostructures MoTe₂/Graphene/SnS₂ and GaTe/InSe. We have found that nonstoichiometric Fe_1–xS₂ QDs (x = 0.01–0.107) with strong localized surface plasmonic resonance (LSPR) can have much enhanced absorption in broadband from ultraviolet to short-wave infrared (SWIR, 1–3 μm). Consequently, the LSPR Fe1–xS2 QDs/graphene heterostructure photodetectors exhibit extraordinary photoresponsivity in exceeding 4.32 ×106 A/W and figure-of-merit detectivity D* < 7.50 ×10¹² Jones in the broadband of UV–Vis–SWIR at room temperature. The 2D vdW heterostructures allows novel designs of interface band alignments with uncooled NIR-SWIR D* up to 10¹²Jones. These results illustrate that the heterostructure nanohybrids provide a promising pathway for low-cost, printable and flexible infrared detectors and imaging systems.

Conference Presentation

Citation Download Citation

Judy Z. Wu "Exploration of uncooled quantum infrared detectors based on quantum dots/graphene heterostructures", Proc. SPIE 11407, Infrared Technology and Applications XLVI, 1140706 (23 April 2020); https://doi.org/10.1117/12.2556930

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