Thermally Activated Second-Order Recombination Hints toward Indirect Recombination in Fully Inorganic CsPbI<sub>3</sub> Perovskites

Journal article (2018)

Authors

E.M. Hutter ChemE/Opto-electronic Materials - AS
T.J. Savenije ChemE/Opto-electronic Materials - AS
Research Group
ChemE/Opto-electronic Materials (AS) (TU Delft)
Copyright: © 2018 E.M. Hutter, T.J. Savenije
DOI
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https://doi.org/10.1021/acsenergylett.8b01106
More Info
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Published Date

2018

Language

English

Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Opto-electronic Materials

Abstract

The relationship between the dipole moment of the methylammonium cation and the optoelectronic properties of lead halide perovskites remains under debate. We show that both the temperature-dependent charge carrier mobility and recombination kinetics are identical for methylammonium and cesium lead iodide, indicating that the role of the monovalent cation is subordinate to the lead iodide framework. From the observation that for both perovskites the electron-hole recombination is thermally activated, we speculate that the bandgap is slightly indirect.