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Defects in halide perovskites: The lattice as a boojum?

Published online by Cambridge University Press:  16 June 2020

Sujit Kumar
Affiliation:
Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Israel; sujit.physics09@gmail.com
Gary Hodes
Affiliation:
Department of Materials and Interfaces, Weizmann Institute of Science, Israel; gary.hodes@weizmann.ac.il
David Cahen
Affiliation:
Weizmann Institute of Science, Israel, and Bar-Ilan University, Israel; david.cahen@weizmann.ac.il
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Abstract

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. We hope this article will stimulate discussions on the nontrivial question: Are HaPs, and especially the defects within them, business as usual?

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Type
Halide Perovskite Opto- and Nanoelectronic Materials and Devices
Copyright
Copyright © Materials Research Society 2020

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