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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
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URI: https://cronfa.swan.ac.uk/Record/cronfa63216
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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. 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spelling v2 63216 2023-04-20 Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering 98f529f56798da1ba3e6e93d2817c114 0000-0003-4325-8573 Vincent Teng Vincent Teng true false 2023-04-20 EEEG 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. Journal Article Materials & Design 229 111934 Elsevier BV 0264-1275 PbS Colloidal quantum dots, Bi2Te3, Extended wavelength, Photodetector, Band alignment engineering stability 1 5 2023 2023-05-01 10.1016/j.matdes.2023.111934 http://dx.doi.org/10.1016/j.matdes.2023.111934 COLLEGE NANME Electronic and Electrical Engineering COLLEGE CODE EEEG Swansea University This work was supported by Yunnan Province Innovation Team Project (2018HC020) and National Key Research and Development Program of China (2019YFB2203404). 2023-05-24T10:24:50.4593909 2023-04-20T08:33:18.5503529 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering Lijing Yu 1 Pin Tian 2 Libin Tang 3 Qun Hao 4 Vincent Teng 0000-0003-4325-8573 5 Hefu Zhong 6 Wenbin Zuo 7 Yulong Ji 8 Hongfu Li 9 Zhihua Li 10 Qi Ma 11 Min Yang 12 Lianjie Yu 13 63216__27585__bdd76d6620bc48fb9119fe44cb11097c.pdf 63216.pdf 2023-05-24T10:23:12.6779446 Output 1980176 application/pdf Version of Record true This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering
spellingShingle Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering
Vincent Teng
title_short Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering
title_full Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering
title_fullStr Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering
title_full_unstemmed Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering
title_sort Extended wavelength and enhanced sensitivity of PbS colloidal quantum dots/Bi2Te3 photodetector by band alignment engineering
author_id_str_mv 98f529f56798da1ba3e6e93d2817c114
author_id_fullname_str_mv 98f529f56798da1ba3e6e93d2817c114_***_Vincent Teng
author Vincent Teng
author2 Lijing Yu
Pin Tian
Libin Tang
Qun Hao
Vincent Teng
Hefu Zhong
Wenbin Zuo
Yulong Ji
Hongfu Li
Zhihua Li
Qi Ma
Min Yang
Lianjie Yu
format Journal article
container_title Materials & Design
container_volume 229
container_start_page 111934
publishDate 2023
institution Swansea University
issn 0264-1275
doi_str_mv 10.1016/j.matdes.2023.111934
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering
url http://dx.doi.org/10.1016/j.matdes.2023.111934
document_store_str 1
active_str 0
description 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.
published_date 2023-05-01T10:24:49Z
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score 11.01628

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