An ultra-violet and infrared dual-band photodetector using a Ga2O3 thin film and HgTe colloidal quantum dots

Qiqi Zheng, Yu Yang, Liansheng Li, Qing An Xu, Kenan Zhang, Xiaomeng Xue, Lisha Ma, Jianhao Yu, Wanjun Li*, Menglu Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Dual-band photodetection of ultraviolet (UV) and infrared (IR) light is an advanced technology aimed at simultaneously or selectively detecting signals from these two distinct wavelength bands. This technique offers broad application prospects, particularly in environments requiring multispectral information. In this work, a solar-blind UV photodetector made from an amorphous Ga2O3 (a-Ga2O3) thin film was combined with a short-wave infrared photodetector made from a HgTe colloidal quantum dot (CQD) film. The photodetector exhibited a high responsivity of up to 1808 A W−1, detectivity of 3.88 × 1014 Jones, and an external quantum efficiency of 8.8 × 105% at UV wavelength as well as a responsivity of 0.25 A W−1, detectivity of 1.45 × 1010 Jones, and an external quantum efficiency of 15.5% at short-wave infrared wavelength. Furthermore, corona discharge detection using this photodetector was demonstrated.

Original languageEnglish
Pages (from-to)2248-2254
Number of pages7
JournalNanoscale Advances
Volume7
Issue number8
DOIs
Publication statusPublished - 17 Feb 2025
Externally publishedYes

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