Infrared photoconduction at the diffusion length limit in HgTe nanocrystal arrays

Audrey Chu, Charlie Gréboval, Yoann Prado, Hicham Majjad, Christophe Delerue, Jean-Francois Dayen, Grégory Vincent and Emmanuel Lhuillier ()
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Audrey Chu: Sorbonne Université, CNRS, Institut des NanoSciences de Paris
Charlie Gréboval: Sorbonne Université, CNRS, Institut des NanoSciences de Paris
Yoann Prado: Sorbonne Université, CNRS, Institut des NanoSciences de Paris
Hicham Majjad: Université de Strasbourg, IPCMS-CNRS UMR 7504
Christophe Delerue: Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, Junia, UMR 8520 - IEMN
Jean-Francois Dayen: Université de Strasbourg, IPCMS-CNRS UMR 7504
Grégory Vincent: ONERA - The French Aerospace Lab
Emmanuel Lhuillier: Sorbonne Université, CNRS, Institut des NanoSciences de Paris

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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 105 times higher than for conventional µm-scale channel length. In this work the associated specific detectivity exceeds 1012 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 short-wave infrared detection.

Date: 2021
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DOI: 10.1038/s41467-021-21959-x

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