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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

218 Scopus citations


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 AgBi2I7thin films are prepared by spin-coating silver and bismuth precursors dissolved in n-butylamine and annealing under an N2atmosphere. X-ray diffraction analysis reveals the pure cubic structure (Fd3m) with lattice parameters of a=b=c=12.223 Å. The resultant AgBi2I7thin 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)9586-9590
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number33
StatePublished - Aug 8 2016


  • AgBiI
  • iodobismuthates
  • non-toxic photovoltaics
  • solution processing
  • thin films

ASJC Scopus subject areas

  • General Chemistry
  • Catalysis


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