title: Effect of Electron Transporting Layer on Bismuth-Based Lead-Free Perovskite (CH3NH3)3 Bi2I9 for Photovoltaic Applications.
abstract: Methylammonium iodo bismuthate ((CH3NH3)3Bi2I9) (MBI) perovskite is a promising alternative to rapidly progressing hybrid organic-inorganic lead perovskites because of its better stability and low toxicity compared to lead-based perovskites. Solution-processed perovskite fabricated by single-step spin-coating and subsequent heating produced polycrystalline films of hybrid perovskite (CH3NH3)3Bi2I9), whose morphology was influenced drastically by the nature of substrates. The optical measurements showed a strong absorption band around 500 nm. The devices made on anatase TiO2 mesoporous layer showed good performance with current density over 0.8 mA cm(-2) while the devices on brookite TiO2 layer and planar (free of porous layer) was inefficient. However, all the MBI devices were stable to ambient conditions for more than 10 weeks.
authors.affiliation: Graduate School of Engineering, Toin University of Yokohama , 1614 Kuroganecho, Aoba, Yokohama 225-8503, Japan.
authors.forename: Trilok
authors.initials: T
authors.lastname: Singh
authors.affiliation: Graduate School of Engineering, Toin University of Yokohama , 1614 Kuroganecho, Aoba, Yokohama 225-8503, Japan.
authors.forename: Ashish
authors.initials: A
authors.lastname: Kulkarni
authors.affiliation: Graduate School of Engineering, Toin University of Yokohama , 1614 Kuroganecho, Aoba, Yokohama 225-8503, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Ikegami
authors.affiliation: Graduate School of Engineering, Toin University of Yokohama , 1614 Kuroganecho, Aoba, Yokohama 225-8503, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Miyasaka
keywords: TiO2 anatase mesoporous; TiO2 brookite mesoporous; TiO2 compact layer (CL); hybrid perovskite; lead-free perovskite; methylammonium iodo bismuthate (MBI); stability