Boosting the Performance of Carbon‐Based Hole‐Transport‐Layer‐Free CsPbI2Br Solar Cells by Adding Imidazole Small Molecules. - Liu, Hai; Ma, Xueyan; Li, Wenxuan; Wan, Guodong; Liu, Xiaoyang; Li, Yali; Fu, Yujun; He, Deyan; Li, Junshuai (Progress in Photovoltaics, 2026)