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Room Temperature Broadband Bi2Te3/PbS Colloidal Quantum Dots Infrared Photodetectors

Lijing Yu, Pin Tian, Libin Tang, Wenbin Zuo, Hefu Zhong, Qun Hao, Vincent Teng Orcid Logo, Guiqin Zhao, Runhong Su, Xiaoxia Gong, Jun Yuan

Sensors, Volume: 23, Issue: 9, Start page: 4328

Swansea University Author: Vincent Teng Orcid Logo

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DOI (Published version): 10.3390/s23094328

Abstract

Lead sulfide colloidal quantum dots (PbS CQDs) are promising optoelectronic materials due to their unique properties, such as tunable band gap and strong absorption, which are of immense interest for application in photodetectors and solar cells. However, the tunable band gap of PbS CQDs would only...

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Published in: Sensors
ISSN: 1424-8220
Published: MDPI AG
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URI: https://cronfa.swan.ac.uk/Record/cronfa63264
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Abstract: Lead sulfide colloidal quantum dots (PbS CQDs) are promising optoelectronic materials due to their unique properties, such as tunable band gap and strong absorption, which are of immense interest for application in photodetectors and solar cells. However, the tunable band gap of PbS CQDs would only cover visible short-wave infrared; the ability to detect longer wavelengths, such as mid- and long-wave infrared, is limited because they are restricted by the band gap of the bulk material. In this paper, a novel photodetector based on the synergistic effect of PbS CQDs and bismuth telluride (Bi2Te3) was developed for the detection of a mid-wave infrared band at room temperature. The device demonstrated good performance in the visible-near infrared band (i.e., between 660 and 850 nm) with detectivity of 1.6 × 1010 Jones at room temperature. It also exhibited photoelectric response in the mid-wave infrared band (i.e., between 4.6 and 5.1 μm). The facile fabrication process and excellent performance (with a response of up to 5.1 μm) of the hybrid Bi2Te3/PbS CQDS photodetector are highly attractive for many important applications that require high sensitivity and broadband light detection.
Keywords: photodetector; room temperature; colloidal quantum dots (CQDs); Bi2Te3; synergy effect; broadband
College: Faculty of Science and Engineering
Funders: This research was funded by the National Key Research and Development Program of China (2019YFB2203404) and the Yunnan Province Innovation Team Project (2018HC020).
Issue: 9
Start Page: 4328

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