硒
二聚体
太阳能电池
化学
化学工程
光化学
材料科学
有机化学
光电子学
工程类
作者
Meilin Ou,Siqi Xiong,Xiangyu Shen,Hanjian Lai,Xue Lai,Yunpeng Wang,Heng Li,Feng He
标识
DOI:10.1021/acs.macromol.4c00421
摘要
Selenium-containing materials are believed to expand the range of light absorption. The larger and more polarizable selenium atoms enable strong Se–Se interactions between molecules, which enhance both crystallinity and electron mobility. Dimerized acceptor materials linked by end-groups exhibit reduced crystallinity due to the sacrifices of end-groups. To enhance the crystallinity of dimers, we substituted the central core of the Y-series molecules with selenium and used selenophene as the linker unit to synthesize three dimer acceptors. The introduction of selenium atoms led to a noteworthy increase in the absorption coefficient, a significant decrease in the Urbach energy, and an improvement in the crystallinity. The three dimers were used to prepare Q-PHJ solar cell devices with PBQx-H-TF as the donor. It was found that dBSeIC2Cl-Se-OD had the highest power conversion efficiency (PCE) of 17.03%, which is significantly higher than that of dBTIC-Se-HD without selenium substitution of the central core. This improvement was mainly attributed to the significant increase in short-circuit current (JSC) and fill factor (FF). The results suggest that the strategy of selenium substitution in the central core applied to the dimer acceptor can effectively improve the properties of the molecule, which, in turn, affects the performance of the solar cell device.
科研通智能强力驱动
Strongly Powered by AbleSci AI