Lead-free Pseudo-three-dimensional Organic-inorganic Iodobismuthates for Photovoltaic Applications

Tianyue Li, Yue Hu, Carole Morrison, Wenjun Wu, Hongwei Han, Neil Robertson

Research output: Contribution to journalArticlepeer-review


Two organic-inorganic iodobismuthates, C5H6NBiI4 ([py][BiI4]) and C6H8NBiI4 ([mepy][BiI4]), have been prepared with their structures revealed by single-crystal X-ray diffraction. One-dimensional BiI4- anionic chains built by edge-sharing BiI6 octahedra were found in both materials; short I…I, I…C contacts and hydrogen bonding give rise to three-dimensional intermolecular interactions. Both compounds are semiconductors, with band gaps of around 2.0 eV, and the contribution from the organic moieties to the conduction band minimum has been derived by density functional theory. Solid-state optical and electrochemical studies performed on powders and thin films were carried out, and their stabilities under ambient environment have been demonstrated. Use as the absorber layer in printable mesoscopic solar cells without hole transport material has led to efficiencies up to 0.9%, showing a promising new approach towards the development of lead-free third-generation photovoltaic materials.
Original languageEnglish
JournalSustainable Energy & Fuels
Early online date16 Jan 2017
Publication statusE-pub ahead of print - 16 Jan 2017


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