Double‐sided nano‐textured surfaces for industry compatible high‐performance silicon heterojunction and perovskite/silicon tandem solar cells

Abstract 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.