Room Temperature Processing of Inorganic Perovskite Films to Enable Flexible Solar Cells

Dianyi Liu; Chenchen Yang; Matthew Bates; Richard R Lunt

doi:10.1016/j.isci.2018.08.005

Room Temperature Processing of Inorganic Perovskite Films to Enable Flexible Solar Cells

iScience. 2018 Aug 31:6:272-279. doi: 10.1016/j.isci.2018.08.005. Epub 2018 Aug 11.

Authors

Dianyi Liu¹, Chenchen Yang¹, Matthew Bates¹, Richard R Lunt²

Affiliations

¹ Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA.
² Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA. Electronic address: rlunt@msu.edu.

Abstract

Inorganic lead halide perovskite materials have attracted great attention recently due to their potential for greater thermal stability compared with hybrid organic perovskites. However, the high processing temperature to convert from the non-perovskite phase to the cubic perovskite phase in many of these systems has limited their application in flexible optoelectronic devices. Here, we report a room temperature processed inorganic perovskite solar cell (PSC) based on CsPbI₂Br as the light harvesting layer. By combining this composition with key precursor solvents, we show that inorganic perovskite films can be prepared by the vacuum-assist method under room temperature conditions in air. Unencapsulated devices achieved power conversion efficiency up to 8.67% when measured under 1-sun irradiation. Exploiting this room temperature process, flexible inorganic PSCs based on an inorganic metal halide perovskite material are demonstrated.

Keywords: Energy Materials; Inorganic Materials; Materials Chemistry.