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

TL;DR

This paper demonstrates a room-temperature process for creating inorganic perovskite films, enabling flexible solar cells with improved thermal stability and a power conversion efficiency of 8.67%.

Contribution

It introduces a novel room-temperature vacuum-assisted method for fabricating inorganic perovskite films suitable for flexible solar cells.

Findings

Achieved up to 8.67% power conversion efficiency.

Successfully fabricated flexible inorganic perovskite solar cells.

Enabled room-temperature processing in air environment.

Abstract

Inorganic lead halide perovskite materials have attracted great attention recently due to their potential for greater thermal stability compared to hybrid organic perovskites. However, the high processing temperature to convert from the non-perovskite phase to cubic perovskite phase in many of these systems has limited their application in flexible optoelectronic devices. Here, we report a room temperature processed inorganic PSC based on CsPbI2Br as the light harvesting layer. By combing this composition with key precursor solvents, we show that the inorganic perovskite film can be prepared by the vacuum-assist method under room temperature conditions in air. Unencapsulated devices achieved the 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 is demonstrated.