Photodetectors Based on Lead Sulfide Quantum Dot and Organic Absorbers for Multispectral Sensing in the Visible to Short-Wave Infrared Range

PaperPaios
Written By Fluxim AG

Vladimir Pejović, Epimitheas Georgitzikis, Itai Lieberman, Paweł E. Malinowski, Paul Heremans, David Cheyns

Adv Funct. Mat., (2022)

https://doi.org/10.1002/adfm.202201424

Image sensors based on colloidal quantum dots (CQDs) are expected to deliver affordable infrared image sensors to wider application scope. Here, a dual-band photodetector based on PbS CQDs is presented. By engineering the surface of CQDs, two oppositely facing pn junctions are fabricated in series, which enable sensing in two spectral channels. The presented photodetectors exhibit low dark current below 500 nA cm−2 at 1 V bias, a fast response measured in microseconds, as well as high external quantum efficiency, reaching 70% in NIR and 30% in SWIR.

Fluxim AG
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