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Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure
An initial improvement in performance of PbS quantum dot solar cells composed of one thick layer of PbS quantum dots (QDs) treated with tetrabutylammonium iodide (PbS–TBAI) and one thin layer of PbS QDs capped with 1,2-ethanedithiol (PbS–EDT) over short-term air exposure is widely observed. However,...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9080000/ https://www.ncbi.nlm.nih.gov/pubmed/35541328 http://dx.doi.org/10.1039/c8ra01422a |
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author | Gao, Wenhui Zhai, Guangmei Zhang, Caifeng Shao, Zhimeng Zheng, Lulu Zhang, Yong Yang, Yongzhen Li, Xuemin Liu, Xuguang Xu, Bingshe |
author_facet | Gao, Wenhui Zhai, Guangmei Zhang, Caifeng Shao, Zhimeng Zheng, Lulu Zhang, Yong Yang, Yongzhen Li, Xuemin Liu, Xuguang Xu, Bingshe |
author_sort | Gao, Wenhui |
collection | PubMed |
description | An initial improvement in performance of PbS quantum dot solar cells composed of one thick layer of PbS quantum dots (QDs) treated with tetrabutylammonium iodide (PbS–TBAI) and one thin layer of PbS QDs capped with 1,2-ethanedithiol (PbS–EDT) over short-term air exposure is widely observed. However, the underlying mechanisms still remain elusive. In the work, we sought to understand the mechanisms as well as their physicochemical origins using a combination of X-ray photoelectron spectroscopy (XPS) and various electronic measurements. It is found that the PbS–TBAI film plays a dominant role in the initial device performance improvement compared with the PbS–EDT film. The PbS–TBAI film is compensation doped upon short-term air exposure (one to three days) owing to the increase of Pb–O and/or Pb–OH species, enabling its energy band to align better with the electron transport layer for more efficient charge extraction. Moreover, it is demonstrated that the short-term air exposure is capable of reducing defects in the devices and improving the diode quality, resulting in an initial increase in device performance. This work contributes to the fundamental understanding of the surface chemistry changes of PbS quantum dots treated by different ligands over air-exposure and the role of surface chemistry of quantum dots in optimizing their photovoltaic performance. |
format | Online Article Text |
id | pubmed-9080000 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90800002022-05-09 Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure Gao, Wenhui Zhai, Guangmei Zhang, Caifeng Shao, Zhimeng Zheng, Lulu Zhang, Yong Yang, Yongzhen Li, Xuemin Liu, Xuguang Xu, Bingshe RSC Adv Chemistry An initial improvement in performance of PbS quantum dot solar cells composed of one thick layer of PbS quantum dots (QDs) treated with tetrabutylammonium iodide (PbS–TBAI) and one thin layer of PbS QDs capped with 1,2-ethanedithiol (PbS–EDT) over short-term air exposure is widely observed. However, the underlying mechanisms still remain elusive. In the work, we sought to understand the mechanisms as well as their physicochemical origins using a combination of X-ray photoelectron spectroscopy (XPS) and various electronic measurements. It is found that the PbS–TBAI film plays a dominant role in the initial device performance improvement compared with the PbS–EDT film. The PbS–TBAI film is compensation doped upon short-term air exposure (one to three days) owing to the increase of Pb–O and/or Pb–OH species, enabling its energy band to align better with the electron transport layer for more efficient charge extraction. Moreover, it is demonstrated that the short-term air exposure is capable of reducing defects in the devices and improving the diode quality, resulting in an initial increase in device performance. This work contributes to the fundamental understanding of the surface chemistry changes of PbS quantum dots treated by different ligands over air-exposure and the role of surface chemistry of quantum dots in optimizing their photovoltaic performance. The Royal Society of Chemistry 2018-04-20 /pmc/articles/PMC9080000/ /pubmed/35541328 http://dx.doi.org/10.1039/c8ra01422a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Gao, Wenhui Zhai, Guangmei Zhang, Caifeng Shao, Zhimeng Zheng, Lulu Zhang, Yong Yang, Yongzhen Li, Xuemin Liu, Xuguang Xu, Bingshe Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure |
title | Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure |
title_full | Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure |
title_fullStr | Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure |
title_full_unstemmed | Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure |
title_short | Towards understanding the initial performance improvement of PbS quantum dot solar cells upon short-term air exposure |
title_sort | towards understanding the initial performance improvement of pbs quantum dot solar cells upon short-term air exposure |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9080000/ https://www.ncbi.nlm.nih.gov/pubmed/35541328 http://dx.doi.org/10.1039/c8ra01422a |
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