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Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering

Lijing Yu, Pin Tian, Libin Tang, Qun Hao, Vincent Teng Orcid Logo, Hefu Zhong, Wenbin Zuo, Yulong Ji, Hongfu Li, Zhihua Li, Qi Ma, Min Yang, Lianjie Yu

Materials & Design, Volume: 229, Start page: 111934

Swansea University Author: Vincent Teng Orcid Logo

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DOI (Published version): 10.1016/j.matdes.2023.111934

Abstract

The tunable band gap of PbS colloidal quantum dots (CQDs) from ultraviolet (UV) to short-wave infrared (SWIR) bands provides many potential applications in optoelectronics. However, synthesis of large-sized CQDs that exhibit good stability and sensitivity for extended wavelength still remains a tech...

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Published in: Materials & Design
ISSN: 0264-1275
Published: Elsevier BV 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa63216
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Abstract: The tunable band gap of PbS colloidal quantum dots (CQDs) from ultraviolet (UV) to short-wave infrared (SWIR) bands provides many potential applications in optoelectronics. However, synthesis of large-sized CQDs that exhibit good stability and sensitivity for extended wavelength still remains a technological challenge. In this paper, a novel broadband photodetector based on small size PbS CQDs (with exciton absorption peak at 927 nm) and Bi2Te3 (with wide spectral sensitivity and high absorption) was developed and studied. The device, which comprised of ITO/AZO/PbS CQDs/Bi2Te3/Al, provided an excellent band alignment that facilitated charge dissociation and transmission hence improving the device sensitivity. Furthermore, wavelength extension was also realized through the synergistic effect of these materials, thus demonstrating broadband photodetection with high sensitivity. The heterostructure photodetector demonstrated good performance in the visible and near infrared ranges, especially at a wavelength of 1050 nm exhibiting a high responsivity (R) and detectivity (D*) of 161 A/W and 3.2×1013 Jones, respectively. In addition, the device exhibited excellent stability and reversibility after one month of storage without any encapsulation. This work lays a good foundation for the construction of the next generation of highly sensitive broadband CQDs photodetectors.
Keywords: PbS Colloidal quantum dots, Bi2Te3, Extended wavelength, Photodetector, Band alignment engineering stability
College: Faculty of Science and Engineering
Funders: This work was supported by Yunnan Province Innovation Team Project (2018HC020) and National Key Research and Development Program of China (2019YFB2203404).
Start Page: 111934

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