Operando Characterizations of Light-Induced Junction Evolution in Perovskite Solar Cells

Chuanxiao Xiao, Yaxin Zhai, Zhaoning Song, Kang Wang, Changlei Wang, Chun-Sheng Jiang, Matthew Beard, Yanfa Yan, Mowafak Al-Jassim

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations

Abstract

Light-induced performance changes in metal halide perovskite solar cells (PSCs) have been studied intensively over the last decade, but little is known about the variation in microscopic optoelectronic properties of the perovskite heterojunctions in a completed device during operation. Here, we combine Kelvin probe force microscopy and transient reflection spectroscopy techniques to spatially resolve the evolution of junction properties during the operation of metal-halide PSCs and study the light-soaking effect. Our analysis showed a rise of an electric field at the hole-transport layer side, convoluted with a more reduced interfacial recombination rate at the electron-transport layer side in the PSCs with an n-i-p structure. The junction evolution is attributed to the effects of ion migration and self-poling by built-in voltage. Device performances are correlated with the changes of electrostatic potential distribution and interfacial carrier dynamics. Our results demonstrate a new route for studying the complex operation mechanism in PSCs.

Original languageAmerican English
Pages (from-to)20909-20916
Number of pages8
JournalACS Applied Materials and Interfaces
Volume15
Issue number17
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.

NREL Publication Number

  • NREL/JA-5K00-84562

Keywords

  • electric field
  • interfacial recombination
  • junction
  • light soak
  • operando characterizations
  • operation mechanism
  • perovskite solar cell

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