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Title: 14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Abstract

Surface manipulation of quantum dots (QDs) has been extensively reported to be crucial to their performance when applied into optoelectronic devices, especially for photovoltaic devices. In this work, an efficient surface passivation method for emerging CsPbI3 perovskite QDs using a variety of inorganic cesium salts (cesium acetate (CsAc), cesium idodide (CsI), cesium carbonate (Cs2CO3), and cesium nitrate (CsNO3)) is reported. The Cs-salts post-treatment can not only fill the vacancy at the CsPbI3 perovskite surface but also improve electron coupling between CsPbI3 QDs. As a result, the free carrier lifetime, diffusion length, and mobility of QD film are simultaneously improved, which are beneficial for fabricating high-quality conductive QD films for efficient solar cell devices. After optimizing the post-treatment process, the short-circuit current density and fill factor are significantly enhanced, delivering an impressive efficiency of 14.10% for CsPbI3 QD solar cells. In addition, the Cs-salt-treated CsPbI3 QD devices exhibit improved stability against moisture due to the improved surface environment of these QDs. These findings will provide insight into the design of high-performance and low-trap-states perovskite QD films with desirable optoelectronic properties.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [1];  [1];  [4];  [1];  [1]; ORCiD logo [2];  [1];  [1]
  1. Soochow University
  2. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  3. Henan Normal University
  4. University of Western Ontario
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1543252
Report Number(s):
NREL/JA-5900-74344
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 9; Journal Issue: 28
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; cesium acetate; CsPbI3; perovskite quantum dots; solar cells; surface passivation

Citation Formats

Ling, Xufeng, Zhou, Sijie, Yuan, Jianyu, Shi, Junwei, Qian, Yuli, Larson, Bryon W, Zhao, Qian, Qin, Chaochao, Li, Fangchao, Shi, Guozheng, Stewart, Connor, Hu, Jiaxin, Zhang, Xuliang, Luther, Joseph M, Duhm, Steffen, and Ma, Wanli. 14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation. United States: N. p., 2019. Web. doi:10.1002/aenm.201900721.
Ling, Xufeng, Zhou, Sijie, Yuan, Jianyu, Shi, Junwei, Qian, Yuli, Larson, Bryon W, Zhao, Qian, Qin, Chaochao, Li, Fangchao, Shi, Guozheng, Stewart, Connor, Hu, Jiaxin, Zhang, Xuliang, Luther, Joseph M, Duhm, Steffen, & Ma, Wanli. 14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation. United States. doi:10.1002/aenm.201900721.
Ling, Xufeng, Zhou, Sijie, Yuan, Jianyu, Shi, Junwei, Qian, Yuli, Larson, Bryon W, Zhao, Qian, Qin, Chaochao, Li, Fangchao, Shi, Guozheng, Stewart, Connor, Hu, Jiaxin, Zhang, Xuliang, Luther, Joseph M, Duhm, Steffen, and Ma, Wanli. Sun . "14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation". United States. doi:10.1002/aenm.201900721.
@article{osti_1543252,
title = {14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation},
author = {Ling, Xufeng and Zhou, Sijie and Yuan, Jianyu and Shi, Junwei and Qian, Yuli and Larson, Bryon W and Zhao, Qian and Qin, Chaochao and Li, Fangchao and Shi, Guozheng and Stewart, Connor and Hu, Jiaxin and Zhang, Xuliang and Luther, Joseph M and Duhm, Steffen and Ma, Wanli},
abstractNote = {Surface manipulation of quantum dots (QDs) has been extensively reported to be crucial to their performance when applied into optoelectronic devices, especially for photovoltaic devices. In this work, an efficient surface passivation method for emerging CsPbI3 perovskite QDs using a variety of inorganic cesium salts (cesium acetate (CsAc), cesium idodide (CsI), cesium carbonate (Cs2CO3), and cesium nitrate (CsNO3)) is reported. The Cs-salts post-treatment can not only fill the vacancy at the CsPbI3 perovskite surface but also improve electron coupling between CsPbI3 QDs. As a result, the free carrier lifetime, diffusion length, and mobility of QD film are simultaneously improved, which are beneficial for fabricating high-quality conductive QD films for efficient solar cell devices. After optimizing the post-treatment process, the short-circuit current density and fill factor are significantly enhanced, delivering an impressive efficiency of 14.10% for CsPbI3 QD solar cells. In addition, the Cs-salt-treated CsPbI3 QD devices exhibit improved stability against moisture due to the improved surface environment of these QDs. These findings will provide insight into the design of high-performance and low-trap-states perovskite QD films with desirable optoelectronic properties.},
doi = {10.1002/aenm.201900721},
journal = {Advanced Energy Materials},
number = 28,
volume = 9,
place = {United States},
year = {2019},
month = {6}
}

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