Ionic Liquid‐Assisted Crystallization Strategy Enables Simultaneous Regulation of Microstructure and Trap States for High‐Efficiency Sb 2 (S,Se) 3 Solar Cells

ABSTRACT Developing a feasible and effective crystallization approach to simultaneously amend microstructure and trap states in antimony sulfoselenide (Sb 2 (S,Se) 3 ) absorber is extremely crucial and challenging for high‐efficient solar cells. Herein, a regulation strategy is proposed to control crystallization process of Sb 2 (S,Se) 3 using ionic liquids (ILs) consisted of halide (X) anions (Cl − , Br − , and I − ) and [BMIM] + cations. In particular, the [BMIM]Br creates a liquid microenviroment on Sb 2 (S,Se) 3 surface before decomposition, accelerating the mass transfer, which induces micron‐size grains. Moreover, the [BMIM]Br can promote the [211]‐oriented growth via stronger adsorption on (211) facets…

• NS
  Natural Science Foundation of Guangxi Province

  Award: 2025GXNSFBA069296
• NK
  National Key Research and Development Program of China

  Award: 2024YFB4205003