Probing the ionic defect landscape in halide perovskite solar cells

Sebastian Reichert, Qingzhi An, Young-Won Woo, Aron Walsh, Yana Vaynzof and Carsten Deibel ()
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Sebastian Reichert: Technische Universität Chemnitz
Qingzhi An: Ruprecht-Karls-Universität Heidelberg
Young-Won Woo: Imperial College London
Aron Walsh: Imperial College London
Yana Vaynzof: Ruprecht-Karls-Universität Heidelberg
Carsten Deibel: Technische Universität Chemnitz

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Point defects in metal halide perovskites play a critical role in determining their properties and optoelectronic performance; however, many open questions remain unanswered. In this work, we apply impedance spectroscopy and deep-level transient spectroscopy to characterize the ionic defect landscape in methylammonium lead triiodide (MAPbI3) perovskites in which defects were purposely introduced by fractionally changing the precursor stoichiometry. Our results highlight the profound influence of defects on the electronic landscape, exemplified by their impact on the device built-in potential, and consequently, the open-circuit voltage. Even low ion densities can have an impact on the electronic landscape when both cations and anions are considered as mobile. Moreover, we find that all measured ionic defects fulfil the Meyer–Neldel rule with a characteristic energy connected to the underlying ion hopping process. These findings support a general categorization of defects in halide perovskite compounds.

Date: 2020
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DOI: 10.1038/s41467-020-19769-8

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