@article{Li2025, 
author = {Zhenyu Li and Xiaolei Kong and Jinyuan Zhang and Panpan Zhang and Aoxiang Li and Xixi Zhang and Xinrui Li and Mingqi Tan and Jing Li and Haijun Bin and Yongfang Li and Chenkai Sun},
title = {Efficient open-air and as-cast processed organic solar cells enabled by optimized block and surface morphology using a low-cost terpolymer donor with enhanced dielectric constant},
year = {2025},
journal = {Nano Research},
volume = {18},
number = {12},
pages = {94908153},
keywords = {dielectric constant, organic solar cells, open-air and as-cast processing, low-cost polymer donors, block and surface morphology},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94908153},
doi = {10.26599/NR.2025.94908153},
abstract = {Fabricating organic solar cells (OSCs) in open-air and room-temperature environments is essential for cost-effective roll-to-roll printing, but its performance is limited by non-ideal block and surface morphology of active layer. Herein, we demonstrate a record power conversion efficiency (PCE) of 19.72% in open-air and as-cast processed devices by using a low-cost terpolymer donor (PTQ20-5) to optimize the block and surface morphology. Compared with the counterpart PTQ10, PTQ20-5 shows increased hydrophobicity, which can better prevent the intrusion of H2O molecules in the film formation process in open-air environment, giving excellent humidity tolerance of corresponding devices. Moreover, the enhanced dielectric constant results in reduced exciton binding energy and improved charge transport of PTQ20-5, leading to improved charge separation and transfer, and suppressed carrier recombination in the devices. Besides, the PTQ20-5-based film has more appropriate block morphological features of balanced molecular self-assembly and phase separation, which simultaneously promotes the charge carrier transport and inhibits the carrier recombination at the donor/acceptor interface. This work is of great significance for promoting the industrialization of OSCs.}
}