Review on Practical Interface Engineering of Perovskite Solar Cells: From Efficiency to Stability

摘要

Exceptionally high efficiencies for organic–inorganic hybrid perovskite solar cells(PSCs) have been achieved. However, their operational stability still needs to beimproved. The intrinsic instability of halide perovskites caused by the presence ofvolatile organic cations, as well as the degradation of hybrid perovskites inducedby the adverse permeation of environmental water (H_2O)/oxygen (O_2) and theundesired ion diffusion or migration are the major reasons. Beyond strengtheningperovskites themselves, interface engineering is now regarded as a valid strategy toprolong device lifetime by preventing the undesired degradation pathways. Thiscomprehensive review highlights the utilization of practical interface engineeringfor enhancing the efficiency and stability of organic–inorganic lead halide PSCs.First, the impacts of interface design on the energy-level alignment and carrierdynamics are overviewed. Second, recent progresses on the development ofinterfacial materials for simultaneously achieving high efficiency and stability ofPSCs are summarized. At last, the interfacial layer design principles along withfuture outlook of this rapidly developing field are discussed.