The efficiency of perovskite/Cu(In,Ga)Se2 tandem solar cells is limited by halide segregation in the perovskite layer. Zhang et al. use 2-pyrrolidinone to slow the crystallization of halide intermediates, ensuring a homogeneous distribution and achieving a power conversion efficiency of 27.3%.
- Shaochen Zhang
- Enbing Bi
- Jingjing Xue