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Journal Articles ACS photonics Year : 2023

Nanocrystal-based active photonics device through spatial design of light-matter coupling

Claire Abadie
Charlie Gréboval
Huichen Zhang
Erwan Bossavit
Yoann Prado
Yanko Todorov
Carlo Sirtori

Abstract

Integration of photonic structures in nanocrystal-based photodetectors has been demonstrated to improve device performances. Furthermore, bias-dependent photoresponse can be observed in such devices as a result of the interplay between hopping transport and inhomogeneous electromagnetic field. Here, we investigate the main physical concepts leading to a voltage-dependent photoresponse. We first bring evidence of bias-dependent carrier mobilities in a nanocrystal array over a wide range of temperatures. Then, we realize an infrared sensing device using HgTe nanocrystals, where the electrodes also play the role of a grating, inducing a spatially inhomogeneous absorption. The obtained device exhibits a significant bias-dependent photoresponse while possessing a competitive detection performance in the extended shortwave and mid-wave infrared, with detectivity reaching 7x10 10 Jones at 80 K and a fast response time of around 70 ns. This work provides the foundation for further advancements in nanocrystal-basedactive photonics devices.
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Dates and versions

hal-03710652 , version 1 (30-06-2022)

Identifiers

Cite

Tung Huu Dang, Adrien Khalili, Claire Abadie, Charlie Gréboval, Mariarosa Cavallo, et al.. Nanocrystal-based active photonics device through spatial design of light-matter coupling. ACS photonics, 2023, 9 (7), pp. 2528-2535. ⟨10.1021/acsphotonics.2c00738⟩. ⟨hal-03710652⟩
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