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

Bibliographical note

KAUST Repository Item: Exported on 2021-04-02
Acknowledged KAUST grant number(s): KUS-11-009-21
Acknowledgements: This publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund—Research Excellence Program, and by the Natural Sciences and Engineering Research Council of Canada (NSERC). The authors thank R. Wolowiec, D. Kopilovic, and E. Palmiano for their technical help over the course of this research. The authors thank Yiying Li (Prof. Zhenghong Lu group, Department of Materials Science and Engineering, University of Toronto) and Dr. Srebri Petrov (Department of Chemistry, University of Toronto) for assistance in UPS measurement and Rietveld refinement analysis.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • General Medicine


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