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

Bryon Larson, Qian Zhao, Joseph Luther, Xufeng Ling, Sijie Zhou, Jianyu Yuan, Junwei Shi, Yuli Qian, Chaochao Qin, Fangchao Li, Guozheng Shi, Connor Stewart, Jiaxin Hu, Xuliang Zhang, Steffen Duhm, Wanli Ma

Research output: Contribution to journalArticlepeer-review

263 Scopus Citations

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.

Original languageAmerican English
Article number1900721
Number of pages9
JournalAdvanced Energy Materials
Volume9
Issue number28
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

NREL Publication Number

  • NREL/JA-5900-74344

Keywords

  • cesium acetate
  • CsPbI
  • perovskite quantum dots
  • solar cells
  • surface passivation

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