Inhibiting Li+ migration by thenoyltrifluoroacetone toward efficient and stable perovskite solar cells

Yuting Ma; Gaoyi Han; Meiling Yang; Mengna Guo; Yaoming Xiao; Yao Guo; Wenjing Hou

doi:10.1039/D2QI02460H

Inhibiting Li⁺ migration by thenoyltrifluoroacetone toward efficient and stable perovskite solar cells†

Yuting Ma,^a Gaoyi Han,

*^a Meiling Yang,^a Mengna Guo,^a Yaoming Xiao,*^b Yao Guo

*^c and Wenjing Hou

*^a

Author affiliations

* Corresponding authors

^a Institute of Molecular Science, Key Laboratory of Chemical Biology and Molecular Engineering of Education Ministry, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, P. R. China
E-mail: han_gaoyis@sxu.edu.cn, wjhou2016@sohu.com

^b College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, P. R. China
E-mail: ymxiao@qztc.edu.cn

^c School of Materials Science and Engineering, Henan Joint International Research Laboratory of Nanocomposite Sensing Materials, Anyang Institute of Technology, Anyang 455000, P. R. China
E-mail: Guoyao@ayit.edu.cn

Abstract

Lithium bis(trifluoromethanesulfonyl)imide is commonly employed as a dopant to improve the hole mobility of hole transport layers. However, undesired Li⁺ migration impedes the development of highly efficient and stable perovskite solar cells because the voids left by Li⁺ migration will accelerate the penetration of oxygen and moisture. Here, thenoyltrifluoroacetone (TTA) modifies the perovskite/spiro-OMeTAD interface. TTA can passivate the undercoordinated Pb²⁺ defects via the coordination between carbonyl/thiophenic sulfur and Pb²⁺. TTA can also inhibit the annoying Li⁺ migration by the coordination interaction between carbonyl and Li⁺. Besides, TTA can promote hole extraction by adjusting the energy level matching at the perovskite/hole transport layer interface. A TTA-modified device yields a power conversion efficiency of over 22% and has improved humidity and thermal stability. This finding paves a novel way to suppress undesired Li⁺ migration for highly efficient and stable PSCs.

This article is part of the themed collections: FOCUS: Perovskite Materials and Devices and 2023 Inorganic Chemistry Frontiers HOT articles

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Article information

DOI: https://doi.org/10.1039/D2QI02460H
Article type: Research Article
Submitted: 20 nov 2022
Accepted: 18 mar 2023
First published: 20 mar 2023

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Inorg. Chem. Front., 2023,10, 2294-2303

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Inhibiting Li⁺ migration by thenoyltrifluoroacetone toward efficient and stable perovskite solar cells

Y. Ma, G. Han, M. Yang, M. Guo, Y. Xiao, Y. Guo and W. Hou, Inorg. Chem. Front., 2023, 10, 2294 DOI: 10.1039/D2QI02460H

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