A Refined Bulk P–I–N Structure in All-Polymer Solar Cells To Achieve 20.1% Efficiency and Improved Stability - Jinge Zhu; Rui Zeng; Erjun Zhou; Chao Li; Jiawei Deng; Mengzhen Du; Qing Guo; Mengwei Ji; Zongtao Wang; Yi Lin; Fei Han; Jiaxin Zhuang; et al. (Journal of the American Chemical Society, 2025)