Dual-band infrared imaging using stacked colloidal quantum dot photodiodes

Designing Photovoltaic Devices Using HgTe Nanocrystals for Short and Mid‐Wave Infrared Detection

“…By the time of this article, Tang et al has reported an impressive bicolor photodiode operating in the SWIR and MWIR with detectivity above 10 10 Jones at 80 K in both bands . Our results can be compared with the ones from the literature on Figure and Table , which sum up the nanocrystal based IR sensor state of the art.…”

“…Recent device developments include the demonstration of HgTe‐based field‐effect transistor and phototransistor, introduction of resonators to enhance the device light absorption, achieve pixel‐level spectral filtering or to achieve polarization‐sensitive detector . Devices with multicolor detection have been demonstrated either in the visible and in the IR, or in different IR fields such as SWIR/MWIR and MWIR/LWIR . Thanks to the narrow bandgap nature of the material, the use of multi exciton generation becomes possible at relatively low photon energy .…”

Surface Plasmonic‐Assisted Photocatalysis and Optoelectronic Devices with Noble Metal Nanocrystals: Design, Synthesis, and Applications

“…b) Schematic diagram of CQD‐based double band detector. Reproduced with permission . Copyright 2019, American Chemical Society.…”

“…Colloidal quantum dot (CQD) plays a vital role for enhancing the properties of photodetectors. This is a hot topic for the researchers to access how to improve detector behavior because of their certain drawbacks such as their changeable absorption over the extensive regime of infrared, casing short‐wave infrared with scale length, 1.5–2.5 µm, mid‐wave infrared with scale length, 3–5 µm, and long‐wave infrared with scale length 8–12 µm . Second, and more importantly, the consciousness of multiband detectors not only entails to ease the fabrication process with different bandgap materials into the same detector but also need to suitable design of the device to avail the two separate channels.…”

“…Second, and more importantly, the consciousness of multiband detectors not only entails to ease the fabrication process with different bandgap materials into the same detector but also need to suitable design of the device to avail the two separate channels. Tang et al proposed the CQD‐based double band detector which behaves like two channels with bias switchable spectral response . The dual‐band detector is stacked vertically in back to back diode configuration.…”