Influence of alkaline metal additives for practical use of perovskite solar cells

Abstract

Perovskite solar cells have recently attracted great interest for next generation solar cells such as low-cost, light-weight, and/or flexible solar cells. While power conversion efficiency has reached as high as conventional widely used crystal Si solar cells, long-term stability and large area module production need to be improved for practical use. We found stability and crystal quality of perovskite films are improved by addition of small amount of alkaline metals such as Cs and Rb, which enables to achieve highly stable and large area perovskite solar cells. Here we review the effect of alkaline metal additives for lead-halide perovskite materials.