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Infrared photoconduction at the diffusion length limit in HgTe nanocrystal arrays

Abstract : Narrow band gap nanocrystals offer an interesting platform for alternative design of low-cost infrared sensors. It has been demonstrated that transport in HgTe nanocrystal arrays occurs between strongly-coupled islands of nanocrystals in which charges are partly delocalized. This, combined with the scaling of the noise with the active volume of the film, make case for device size reduction. Here, with two steps of optical lithography we design a nanotrench which effective channel length corresponds to 5-10 nanocrystals, matching the carrier diffusion length. We demonstrate responsivity as high as 1 kA W −1 , which is 10 5 times higher than for conventional µm-scale channel length. In this work the associated specific detectivity exceeds 10 12 Jones for 2.5 µm peak detection under 1 V at 200 K and 1 kHz, while the time response is as short as 20 µs, making this performance the highest reported for HgTe NC-based extended shortwave infrared detection.
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https://hal.archives-ouvertes.fr/hal-03174530
Contributor : Emmanuel Lhuillier <>
Submitted on : Friday, March 19, 2021 - 11:52:30 AM
Last modification on : Friday, April 16, 2021 - 4:52:17 PM

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Audrey Chu, Charlie Gréboval, Yoann Prado, Hicham Majjad, Christophe Delerue, et al.. Infrared photoconduction at the diffusion length limit in HgTe nanocrystal arrays. Nature Communications, Nature Publishing Group, 2021, 12, pp.1794. ⟨10.1038/s41467-021-21959-x⟩. ⟨hal-03174530⟩

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