Experimental evidence for defect tolerance in Pb-halide perovskites

Naga Prathibha Jasti, Igal Levine, Yishay Feldman, Gary Hodes, Sigalit Aharon*, David Cahen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The term defect tolerance (DT) is used often to rationalize the exceptional optoelectronic properties of halide perovskites (HaPs) and their devices. Even though DT lacked direct experimental evidence, it became a “fact” in the field. DT in semiconductors implies that structural defects do not translate to electrical and optical effects (e.g., due to charge trapping), associated with such defects. We present pioneering direct experimental evidence for DT in Pb-HaPs by comparing the structural quality of 2-dimensional (2D), 2D-3D, and 3D Pb-iodide HaP crystals with their optoelectronic characteristics using high-sensitivity methods. Importantly, we get information from the materials’ bulk because we sample at least a few hundred nanometers, up to several micrometers, from the sample’s surface, which allows for assessing intrinsic bulk (and not only surface-) properties of HaPs. The results point to DT in 3D, 2D-3D, and 2D Pb-HaPs. Overall, our data provide an experimental basis to rationalize DT in Pb-HaPs. These experiments and findings will help the search for and design of materials with real DT.

Original languageEnglish
Article numbere2316867121
JournalProceedings of the National Academy of Sciences of the United States of America
Volume121
Issue number18
DOIs
StatePublished - 30 Apr 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2024 the Author(s).

Keywords

  • electronic defects
  • self-healing
  • single crystal
  • structural quality

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