Lead-Free Double Perovskites for Perovskite Solar Cells

摘要

Perovskite solar cells (PSCs) have achieved a high power conversion efficiency(PCE) with a credible certified value over 25%. More efforts have been devoted tothe development of stable and ecofriendly perovskite materials. Lead-free doubleperovskites (LFDPs) are a noteworthy choice as a photoactive layer because oftheir favorable photovoltaic (PV) properties, intrinsic chemical stability, andenvironmental friendliness. This Review presents various LFDP materials whosestructural stability and optoelectronic properties are predicted by theoreticalcalculations. The synthesis and experimental properties of LFDPs and theirapplications in PSCs and optoelectronics in pursuing high performance, lowtoxicity, and functional stability are also reviewed. Perovskites active layers arecritical for PSCs, and their appropriate properties are responsible for achieving ahigh PCE. On the other side, the stability of PSCs under working conditions is acritical requirement for their practical applications. Defect-ordered perovskitesare also presented to provide another outlook on lead-free perovskite-based PVs.The introduction and interest toward LFDP in PSCs can represent a viablesolution to the toxicity issue, stimulate further research, and bring a real impactto future PV technologies.