Vapour-Deposited Cesium Lead Iodide Perovskites: Microsecond Charge Carrier Lifetimes and Enhanced Photovoltaic Performance

Eline Hutter, Rebecca J. Sutton, Sanjana Chandrashekar, Mojtaba Abdi-Jalebi, Samuel D. Stranks, Henry J. Snaith, Tom Savenije

Research output: Contribution to journalArticleScientificpeer-review

84 Citations (Scopus)
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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
Original languageEnglish
Pages (from-to)1901–1908
JournalACS Energy Letters
Volume2
Issue number8
DOIs
Publication statusPublished - 2017

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