Layered Perovskites in Solar Cells: Structure, Optoelectronic Properties, and Device Design

Layered hybrid perovskites (LPKs) have emerged as a viable solution to address perovskite stability concerns and enable their implementation in wide-scale energy harvesting. Yet, although more stable, the performance of devices incorporating LPKs still lags behind that state-of-the-art, multi-cation materials. This is typically assigned poor charge transport, currently caused by choice cations used within organic layer. On balance, compromise between efficiency sought, involving careful control phase purity distribution, interfaces energy/charge transfer processes. Further progress hindered difficulty identifying fundamental optoelectronic processes these Here, high exciton binding lead formation multiple photoexcited species, which greatly complicate measurement interpretation. In this light, review gives an overview how complementary techniques must be separate contributions from different species order identify device bottlenecks, become useful tool narrow down limitless list cations. A move away making compromises mitigate impact transport required. The root problem addressed instead through rational design interlayer