Issue 8, 2023

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

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.

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

Supplementary files

Article information

Article type
Research Article
Submitted
20 nov 2022
Accepted
18 mrt 2023
First published
20 mrt 2023

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

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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