Defects in halide perovskites: The lattice as a boojum?

Sujit Kumar, Gary Hodes, David Cahen

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Although halide perovskites (HaPs) are synthesized in ways that appear antithetical to those required for yielding high-quality semiconductors, the properties of the resulting materials imply, particularly for single crystals, ultralow densities of optoelectronically active defects. This article provides different views of this unusual behavior. We pose the question: Can present models of point defects in solids be used to interpret the experimental data and provide predictive power? The question arises because the measured ultralow densities refer to static defects using our present methods and models, while dynamic defect densities are ultrahigh, a result of the material being relatively soft, with a shallow electrostatic energy landscape, and with anharmonic lattice dynamics. All of these factors make the effects of dynamic defects on the materials' optoelectronic properties minimal.

Original languageEnglish
Pages (from-to)478-484
Number of pages7
JournalMRS Bulletin
Issue number6
StatePublished - 1 Jun 2020

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