Double‐sided Nano‐textured Surfaces for Industry Compatible High‐performance Silicon Heterojunction and Perovskite/silicon Tandem Solar Cells

Nano-textured surfaces are an intriguing approach for optimizing the optical characteristics for monolithic perovskite/silicon tandem solar cells. Here, the development of different textures of silicon surfaces using various commercial additives is presented and their performance in silicon heterojunction (SHJ) and SHJ-perovskite tandem solar cells is discussed. After optical and electrical characterization, we show that nano-textured surfaces can easily compete with standard textured surfaces, yielding higher average efficiencies in single junctions. In addition, their compatibility with solution-processed perovskite top cells is demonstrated, yielding a perovskite/silicon tandem solar cell efficiency of >28% on a bottom cell with nano-texture on both sides.