He Dongmei, Ma Danqing, Zhang Jiajia, Yang Yingying, Ding Jike, Liu Cong, Liu Xinxing, Yu Yue, Liu Tao, Chen Cong, Li Meicheng, Chen Jiangzhao
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, China.
Adv Mater. 2025 Aug;37(33):e2505115. doi: 10.1002/adma.202505115. Epub 2025 Jun 5.
The migration of multiple chemical species is are main factor leading to the intrinsic instability of perovskite solar cells (PSCs). Herein, a universal ion migration suppression strategy is innovatively reported to stabilize multiple functional layers by simultaneously suppressing the migration of multiple mobile chemical species based on host-guest interaction via calixarene supramolecules. After incorporating 4-tert-butylcalix[8]arene (C8A), the interfacial defects are passivated, suppressing trap-assisted nonradiative recombination. Moreover, the p-doping of Spiro-OMeTAD is facilitated, and the extraction and transport of holes are promoted for n-i-p regular PSCs. The C8A doped regular devices based on the two-step perovskite deposition method achieve a power conversion efficiency (PCE) of 26.01% (certified 25.68%), which is the record PCE ever reported for the TiO-based planar PSCs. The C8A passivated p-i-n inverted PSCs obtain a champion PCE of 27.18% (certified 26.79%), which is the highest PCE for the PSCs using the vacuum flash evaporation method. The resulting unsealed inverted device retains 95% of its initial PCE after 1015 h of continuous operation at maximum power point. This work provides a feasible and effective avenue to address the intrinsic instability of perovskite-based photovoltaics and other optoelectronic devices.
