Light Management in Monolithic Perovskite/Silicon Tandem Solar Cells

摘要

Perovskite/silicon tandem solar cells (TSCs), especially two-terminal, with arecord efficiency of 28% already realized, present great potential as low-cost andefficient substitutes for dominant silicon photovoltaics. Achieving efficienciesexceeding 30% is quite realistic, as indicated by extensive optical simulations.Super light management in monolithic perovskite/silicon TSCs is one of theprerequisites to make this a reality. In this Review, various forms of optical losses,such as reflection loss, parasitic absorption, and current mismatch, are analyzedsystematically to provide a better understanding of the performance of perovskite/silicon TSCs. Particularly, a simple refractive index matching rule derivedfrom the Fresnel equation is proposed as a basis for material selection and devicedesign. Meanwhile, an overview of the current strategies and challenges inmonolithic perovskite/silicon TSCs is provided, comprising bandgap engineeringof perovskites and light trapping methods, aiming to provide guidance for furtherimprovement of tandem devices.