Choi Jongchan, Song Chang Eun, Lim Eunhee
Department of Chemistry, Kyonggi University, Suwon 16227, Republic of Korea.
Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea.
Materials (Basel). 2024 Apr 18;17(8):1875. doi: 10.3390/ma17081875.
A series of small molecules, , , and , were synthesized to have a thiophene-flanked difluorobenzene (T-2FB-T) core and alkyl-substituted rhodanine (RH) end groups for their use as nonfullerene acceptors (NFAs) in organic solar cells (OSCs). Octyl, 2-butyloctyl (BO), and 2-hexyldecyl (HD) alkyl side chains were introduced into RHs to control the material's physical properties based on the length and size of the alkyl chains. The optical properties of the three NFAs were found to be almost the same, irrespective of the alkyl chain length, whereas the molecular crystallinity and material solubility significantly differed depending on the alkyl side chains. Owing to the sufficient solubility of , OSCs based on PTB7-Th and were fabricated. A power conversion efficiency of up to 4.49% was obtained by solvent vapor annealing (SVA). The AFM study revealed that improved charge mobility and a smooth and homogeneous film morphology without excessive aggregation could be obtained in the SVA-treated film.
合成了一系列小分子，即 、 和 ，它们具有噻吩两侧的二氟苯（T-2FB-T）核心和烷基取代的罗丹宁（RH）端基，用作有机太阳能电池（OSC）中的非富勒烯受体（NFA）。将辛基、2-丁基辛基（BO）和2-己基癸基（HD）烷基侧链引入到RH中，以根据烷基链的长度和尺寸来控制材料的物理性质。发现这三种NFA的光学性质几乎相同，与烷基链长度无关，而分子结晶度和材料溶解度则根据烷基侧链的不同而有显著差异。由于 具有足够的溶解度，制备了基于PTB7-Th和 的OSC。通过溶剂气相退火（SVA）获得了高达4.49%的功率转换效率。原子力显微镜（AFM）研究表明，在经过SVA处理的薄膜中可以获得改善的电荷迁移率以及光滑且均匀的薄膜形态，且没有过度聚集现象。
