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Aboma Mendasa, MSc, PhD. Photo.

Aboma Merdasa

Researcher

Aboma Mendasa, MSc, PhD. Photo.

Photoprotection in metal halide perovskites by ionic defect formation

Author

  • Nga Phung
  • Alessandro Mattoni
  • Joel A. Smith
  • Dieter Skroblin
  • Hans Köbler
  • Leo Choubrac
  • Joachim Breternitz
  • Jinzhao Li
  • Thomas Unold
  • Susan Schorr
  • Christian Gollwitzer
  • Ivan G. Scheblykin
  • Eva L. Unger
  • Michael Saliba
  • Simone Meloni
  • Antonio Abate
  • Aboma Merdasa
Show all

Summary, in English

Photostability is critical for long-term solar cell operation. While light-triggered defects are usually reported as evidence of material degradation, we reveal that the formation of certain defects in metal halide perovskites is crucial for protection against intense or prolonged light exposure. We identify an inherent self-regulating cycle of formation and recovery of ionic defects under light exposure that mitigates the overheating of the lattice due to hot carrier cooling, which allows exposure to several thousand suns without degrading. The excess energy instead dissipates by forming defects, which in turn alters the optoelectronic properties of the absorber, resulting in a temporary reduction of photon absorption. Defects gradually recover to restore the original optoelectronic properties of the absorber. Photoprotection is a key feature for the photostability in plants. Thus, finding a protection mechanism in metal halide perovskites similar to those in nature is encouraging for the development of long-term sustainable solar cells.

Department/s

  • LTH Profile Area: Photon Science and Technology
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • NanoLund: Centre for Nanoscience
  • Chemical Physics
  • Ophthalmology Imaging Research Group

Publishing year

2022-09-21

Language

English

Pages

2152-2174

Publication/Series

Joule

Volume

6

Issue

9

Document type

Journal article

Publisher

Cell Press

Topic

  • Physical Chemistry

Keywords

  • concentration PV
  • defect chemistry
  • defect recovery
  • density functional theory
  • halide perovskite
  • molecular dynamic simulation
  • photoluminescence
  • photoprotection
  • photostability
  • thermal imaging

Status

Published

Research group

  • Ophthalmology Imaging Research Group

ISBN/ISSN/Other

  • ISSN: 2542-4351