Radical polymeric p-doping and grain modulation for stable, efficient perovskite solar modules

• DOI: 10.1126/science.add8786
• Publication Date: 2023-01-19T18:58:17Z
• Authors: Shuai You; Haipeng Zeng; Yuhang Liu; Bing Han; Min Li; Lin Li; Xin Zheng; Rui Guo; Long Luo; Zhe Li; Chi Zhang; Ranran Liu; Yang Zhao; Shujing Zhang; Qi Peng; Ti Wang; Qi Chen; Felix T. Eickemeyer; Brian Carlsen; Shaik M. Zakeeruddin; Liqiang Mai; Yaoguang Rong; Michael Grätzel; Xiong Li
• Keywords: Glovebox

High-quality perovskite light harvesters and robust organic hole extraction layers are essential for achieving high-performing solar cells (PSCs). We introduce a phosphonic acid-functionalized fullerene derivative in mixed-cation perovskites as grain boundary modulator to consolidate the crystal structure, which enhances tolerance of film against illumination, heat, moisture. also developed redox-active radical polymer, poly(oxoammonium salt), that can effectively p-dope hole-transporting material by injection mitigates lithium ion diffusion. Power conversion efficiencies 23.5% 1-square-centimeter mixed-cation-anion PSCs 21.4% 17.1-square-centimeter minimodules were achieved. The retained 95.5% their initial after 3265 hours at maximum power point tracking under continuous 1-sun illumination 70° ± 5°C.