Vapour-Deposited Cesium Lead Iodide Perovskites

Microsecond Charge Carrier Lifetimes and Enhanced Photovoltaic Performance

Journal article (2017)

Authors

E.M. Hutter ChemE/Opto-electronic Materials - AS
Rebecca J. Sutton University of Oxford
Mojtaba Abdi-Jalebi University of Cambridge
Samuel D. Stranks University of Cambridge
Henry Snaith University of Oxford
T.J. Savenije ChemE/Opto-electronic Materials - AS
Research Group
ChemE/Opto-electronic Materials (AS) (TU Delft)
Copyright: © 2017 E.M. Hutter, Rebecca J. Sutton, Sanjana Chandrashekar, Mojtaba Abdi-Jalebi, Samuel D. Stranks, Henry J. Snaith, T.J. Savenije
DOI: https://doi.org/10.1021/acsenergylett.7b00591
More Info
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Published Date

2017

Language

English

Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Opto-electronic Materials

Abstract

Metal halide perovskites such as methylammonium lead iodide (MAPbI3) are highly promising materials for photovoltaics. However, the relationship between the organic nature of the cation and the optoelectronic quality remains debated. In this work, we investigate the optoelectronic properties of fully inorganic vapour-deposited and spin-coated black-phase CsPbI3 thin films. Using the time-resolved microwave conductivity technique, we measure charge carrier mobilities up to 25 cm2/(V s) and impressively long charge carrier lifetimes exceeding 10 μs for vapour-deposited CsPbI3, while the carrier lifetime reaches less than 0.2 μs in the spin-coated samples. Finally, we show that these improved lifetimes result in enhanced device performance with power conversion efficiencies close to 9%. Altogether, these results suggest that the charge carrier mobility and recombination lifetime are mainly dictated by the inorganic framework rather than the organic nature of the cation