Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 33, Pages 9586-9590Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201603608
Keywords
AgBi2I7; iodobismuthates; non-toxic photovoltaics; solution processing; thin films
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Funding
- King Abdullah University of Science and Technology (KAUST) [KUS-11-009-21]
- Ontario Research Fund-Research Excellence Program
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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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 N-2 atmosphere. X-ray diffraction analysis reveals the pure cubic structure (Fd3m) with lattice parameters of a=b=c=12.223 angstrom. 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.
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