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Nano Research 2023, 16(4): 4888-4894 https://doi.org/10.1007/s12274-021-3737-9
Research Article | Issue | Published: 24 July 2021

Healing the defects in CsPbI3 solar cells by CsPbBr3 quantum dots

Show Author's Information Yanyan Li,  Linrui Duan,  Zhuang Zhang,  Huanhuan Wang,  Tianyang Chen,  Jingshan Luo( )
Institute of Photoelectronic Thin Film Devices and Technology, Solar Energy Research Center, Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300350, China
Keywords:
CsPbBr3 quantum dots, defect passivation, CsPbI3 solar cell
Topics:
Perovskite solar cells
Cite this article:
Li Y, Duan L, Zhang Z, et al. Healing the defects in CsPbI3 solar cells by CsPbBr3 quantum dots. Nano Research, 2023, 16(4): 4888-4894. https://doi.org/10.1007/s12274-021-3737-9
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Abstract Full text Electronic supplementary material About this article

Cesium lead iodide (CsPbI3) is a promising photo-absorber for perovskite photovoltaics due to its high thermal stability and relatively small bandgap. However, there are many defects in solution processed polycrystalline CsPbI3 films especially at the grain boundaries (GBs), which limit the power conversion efficiency (PCE) of CsPbI3 solar cells. In this work, we introduced CsPbBr3 quantum dots (QDs) on top of the CsPbI3 film to passivate the defects. As CsPbBr3 QDs have a small size and a similar crystal structure as the CsPbI3, they are excellent modifiers to fill in the GBs and heal the defects. Moreover, we find there is an anion exchange reaction between the CsPbBr3 QDs and CsPbI3 films, which is evidenced by photoluminescence spectra and grazing incidence X-ray diffraction patterns. The QDs treated films show enhanced carrier lifetime and reduced defect density. Additionally, the ligands on CsPbBr3 QDs increase the hydrophobicity of the films. As a result, the QDs treated CsPbI3 solar cells prepared at high temperature obtain PCEs exceeding 16% with high stability.


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Abstract
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Electronic supplementary material
About this article

Healing the defects in CsPbI3 solar cells by CsPbBr3 quantum dots

Show Author's information Yanyan Li, Linrui Duan, Zhuang Zhang, Huanhuan Wang, Tianyang Chen, Jingshan Luo( )
Institute of Photoelectronic Thin Film Devices and Technology, Solar Energy Research Center, Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300350, China

Abstract

Cesium lead iodide (CsPbI3) is a promising photo-absorber for perovskite photovoltaics due to its high thermal stability and relatively small bandgap. However, there are many defects in solution processed polycrystalline CsPbI3 films especially at the grain boundaries (GBs), which limit the power conversion efficiency (PCE) of CsPbI3 solar cells. In this work, we introduced CsPbBr3 quantum dots (QDs) on top of the CsPbI3 film to passivate the defects. As CsPbBr3 QDs have a small size and a similar crystal structure as the CsPbI3, they are excellent modifiers to fill in the GBs and heal the defects. Moreover, we find there is an anion exchange reaction between the CsPbBr3 QDs and CsPbI3 films, which is evidenced by photoluminescence spectra and grazing incidence X-ray diffraction patterns. The QDs treated films show enhanced carrier lifetime and reduced defect density. Additionally, the ligands on CsPbBr3 QDs increase the hydrophobicity of the films. As a result, the QDs treated CsPbI3 solar cells prepared at high temperature obtain PCEs exceeding 16% with high stability.

Keywords: CsPbBr3 quantum dots, defect passivation, CsPbI3 solar cell

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Publication history
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Acknowledgements

Publication history

Received: 15 April 2021
Revised: 06 July 2021
Accepted: 08 July 2021
Published: 24 July 2021
Issue date: April 2023

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

This study was supported by the National Key Research and Development Program of China (No. 2018YFB1502003 and 2019YFE0123400), the Tianjin Distinguished Young Scholars Fund (No. 20JCJQJC00260), and the Chinese Thousand Talents Program for Young Professionals.

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