Pure Cubic-Phase Hybrid Iodobismuthates AgBi2I7for Thin-Film Photovoltaics

Younghoon Kim, Zhenyu Yang, Ankit Jain, Oleksandr Voznyy, Gi-Hwan Kim, Min Liu, Li Na Quan, F. Pelayo García de Arquer, Riccardo Comin, James Z. Fan, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review


Bismuth-based hybrid perovskites are candidates for lead-free and air-stable photovoltaics, but poor surface morphologies and a high band-gap energy have previously limited these hybrid perovskites. A new materials processing strategy to produce enhanced bismuth-based thin-film photovoltaic absorbers by incorporation of monovalent silver cations into iodobismuthates is presented. Solution-processed AgBi2I7 thin films are prepared by spin-coating silver and bismuth precursors dissolved in n-butylamine and annealing under an N2 atmosphere. X-ray diffraction analysis reveals the pure cubic structure (Fd3m) with lattice parameters of a=b=c=12.223 Å. The resultant AgBi2I7 thin films exhibit dense and pinhole-free surface morphologies with grains ranging in size from 200–800 nm and a low band gap of 1.87 eV suitable for photovoltaic applications. Initial studies produce solar power conversion efficiencies of 1.22 % and excellent stability over at least 10 days under ambient conditions.
Original languageEnglish (US)
Pages (from-to)9738-9742
Number of pages5
JournalAngewandte Chemie
Issue number33
StatePublished - Jun 29 2016
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)


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