文章基本信息

标题：Design Rules of the Mixing Phase and Impacts on Device Performance in High-Efficiency Organic Photovoltaics
本地全文：下载
作者：Jingnan Song ; Ming Zhang ; Tianyu Hao 等
期刊名称：Research
电子版ISSN：2639-5274
出版年度：2022
卷号：2022
页码：1-11
DOI：10.34133/2022/9817267
语种：English
出版社：American Association for the Advancement of Science
摘要：In nonfullerene acceptor- (NFA-) based solar cells, the exciton splitting takes place at both domain interface and donor/acceptor mixture, which brings in the state of mixing phase into focus. The energetics and morphology are key parameters dictating the charge generation, diffusion, and recombination. It is revealed that tailoringthe electronic properties of the mixing region by doping with larger-bandgap components could reduce the density of state but elevate the filling state level, leading to improved open-circuit voltage () and reduced recombination. The monomolecular and bimolecular recombinations are shown to be intercorrelated, which show a Gaussian-like relationship with and linear relationship with short-circuit current density () and fill factor (FF). The kinetics of hole transfer and exciton diffusion scale with similarly, indicating the carrier generation in mixing region and crystalline domain are equally important. From the morphology perspective, the crystalline order could contribute to improvement, and the fibrillar structure strongly affects the FF. These observations highlight the importance of the mixing region and its connection with crystalline domains and point out the design rules to optimize the mixing phase structure, which is an effective approach to further improve device performance.