Optoelectronic and Photovoltaic Properties of the Air-Stable Organohalide Semiconductor (CH 3 NH 3 ) 3 Bi 2 I 9

Mutalifu Abulikemu, Samy Ould-Chikh, Xiaohe Miao, Erkki Alarousu, Murali Banavoth, Guy Olivier Ngongang Ndjawa, Jeremy Barbe, Abdulrahman El Labban, Aram Amassian, Silvano Del Gobbo

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

Lead halide perovskite materials have shown excellent optoelectronic as well as photovoltaic properties. However, the presence of lead and the chemical instability relegate lead halide perovskites to research applications only. Here, we investigate an emerging lead-free and air stable compound (CH3NH3)3Bi2I9 as a non-toxic potential alternative to lead halide perovskites. We have synthesized thin films, powders and millimeter-scale single crystals of (CH3NH3)3Bi2I9 and investigated their structural and optoelectronic properties. We demonstrate that the degree of crystallinity strongly affects the optoelectronic properties of the material, resulting in significantly different band gaps in polycrystalline thin films and single crystals. Surface photovoltage spectroscopy reveals outstanding photocharge generation in the visible (
Original languageEnglish (US)
Pages (from-to)12504-12515
Number of pages12
JournalJ. Mater. Chem. A
Volume4
Issue number32
DOIs
StatePublished - 2016

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