Particle decoration enables solution-processed perovskite integration with fully-textured silicon for efficient tandem solar cells
Naihe Liu, Gao Zhang, Wei Meng, Lijun Yang, Hangyu Gu, Lirong Zeng, Xin Zhang, Yuanhui Geng, Ying‐Jie Zhu, C.F. Shen, Yongyi Wu, Tao Li, Wei Wang, Xiaolei Li, Kaifu Qiu, Peicheng Wei, Guan‐Jun Yang, Jinsong Huang, Bo Chen
Abstract
Perovskite/silicon tandem solar cells can exceed Shockley-Queisser limit, but achieving complete coverage of 2-4 μm pyramids on industrial fully-textured silicon with solution-processed perovskite film remains challenging. We address this issue by spray-coating alumina particles onto fully-textured silicon, creating a super-hydrophilic rough surface that both enhances wet film coverage and provides guided nucleation sites. Although super-hydrophilic effect enhances wetting, it alone is insufficient to achieve complete coverage of pyramids by perovskite film. Beyond enhanced wetting, alumina particles promote uniform nucleation at particle-decorated sites across pyramids by lowering nucleation barrier and suppressing valley-preferred nucleation, which enables near-conformal deposition of perovskite film on pyramids. Additionally, alumina particles reduce nonradiative recombination and extend carrier lifetimes. Using this approach, we achieve a efficiency of 32.74% for perovskite/silicon tandem solar cells with one-step solution-processed perovskite on fully-textured silicon. This strategy offers a pathway for seamless integration of perovskite and silicon photovoltaics into high-performance tandem devices. Achieving complete coverage of 2-4 μm pyramids on industrial fully-textured silicon with solution processed perovskite film remains challenging. Here, authors spray-coat alumina particles on silicon for near-conformal deposition of perovskites, achieving efficiency of 32.74% for tandem solar cells.