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Ivan Scheblykin. Portrait.

Ivan Scheblykin

Professor

Ivan Scheblykin. Portrait.

In Operando Locally-Resolved Photophysics in Perovskite Solar Cells by Correlation Clustering Imaging

Author

  • Boris Louis
  • Sudipta Seth
  • Qingzhi An
  • Ran Ji
  • Yana Vaynzof
  • Johan Hofkens
  • Ivan G. Scheblykin

Summary, in English

The instability of metal halide perovskites limits the commercialization of solar cells despite their impressive efficiencies. This instability, driven by photo-induced ion migration, leads to material restructuring, defect formation, degradation, and defect healing. However, these same “unwanted” properties enable to propose Correlation Clustering Imaging (CLIM), a technique that detects local photoluminescence (PL) fluctuations through wide-field fluorescence microscopy. It is shown that such fluctuations are present in high-quality perovskites and their corresponding solar cells. CLIM successfully visualizes the polycrystalline grain structure in perovskite films, closely matching electron microscopy images. The analysis of fluctuations reveals a dominant metastable defect responsible for the fluctuations. In solar cells in short-circuit conditions, these fluctuations are significantly larger, and corresponding correlated regions extend up to 10 micrometers, compared to 2 micrometers in films. It is proposed that the regions resolved by CLIM in solar cells possess a common pool of charge extraction channels, which fluctuate and cause PL to vary. Since PL fluctuations reflect non-radiative recombination processes, CLIM provides valuable insights into the structural and functional dynamics of carrier transport, ion migration, defect behavior, and recombination losses. CLIM offers a non-invasive approach to understanding luminescent materials and devices in operando, utilizing contrasts based on previously untapped properties.

Department/s

  • LU Profile Area: Light and Materials
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • LTH Profile Area: Photon Science and Technology

Publishing year

2025-02-19

Language

English

Publication/Series

Advanced Materials

Volume

37

Issue

7

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)
  • Physical Chemistry (including Surface- and Colloid Chemistry)

Keywords

  • correlative microscopy
  • functional imaging
  • Inoperando solar cell investigation
  • microspectroscopy
  • optical fluctuation

Status

Published

ISBN/ISSN/Other

  • ISSN: 0935-9648