Fully Vacuum-Processed Wide Band Gap Mixed-Halide Perovskite Solar Cells

Giulia Longo, Cristina Momblona, Maria Grazia La-Placa, Lidón Gil-Escrig, Michele Sessolo, Henk J. Bolink*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


Methylammonium lead mixed-halide perovskites MAPb(BrxI1-x)3 are promising materials for the preparation of tandem devices. When exposed to light, MAPb(BrxI1-x)3 segregates in iodide- and bromide-rich phases, limiting the achievable photovoltage and hence the attainable device efficiency. To date only solution-processed mixed-halide perovskites have been demonstrated. We present fully vacuum-deposited mixed-halide perovskite thin films with band gap of 1.72 and 1.87 eV, prepared by controlling the deposition rates of the different halide precursors. When used in thin-film devices, these materials lead to power conversion efficiencies of 15.9 and 10.5%, respectively, which are among the highest reported to date for these types of wide band gap absorbers.

Original languageEnglish
Pages (from-to)214-219
Number of pages6
JournalACS Energy Letters
Issue number1
Early online date22 Dec 2017
Publication statusPublished - 12 Jan 2018
Externally publishedYes


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