Huang Hao, Guo Qingxin, Feng Shiyu, Zhang Cai'e, Bi Zhaozhao, Xue Wenyue, Yang Jinjin, Song Jinsheng, Li Cuihong, Xu Xinjun, Tang Zheng, Ma Wei, Bo Zhishan
Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, 100875, Beijing, China.
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, 710049, Xi'an, China.
Nat Commun. 2019 Jul 10;10(1):3038. doi: 10.1038/s41467-019-11001-6.
Non-fullerene fused-ring electron acceptors boost the power conversion efficiency of organic solar cells, but they suffer from high synthetic cost and low yield. Here, we show a series of low-cost noncovalently fused-ring electron acceptors, which consist of a ladder-like core locked by noncovalent sulfur-oxygen interactions and flanked by two dicyanoindanone electron-withdrawing groups. Compared with that of similar but unfused acceptor, the presence of ladder-like structure markedly broadens the absorption to the near-infrared region. In addition, the use of intramolecular noncovalent interactions avoids the tedious synthesis of covalently fused-ring structures and markedly lowers the synthetic cost. The optimized solar cells displayed an outstanding efficiency of 13.24%. More importantly, solar cells based on these acceptors demonstrate very low non-radiative energy losses. This research demonstrates that low-cost noncovalently fused-ring electron acceptors are promising to achieve high-efficiency organic solar cells.
非富勒烯稠环电子受体提高了有机太阳能电池的功率转换效率，但它们存在合成成本高和产率低的问题。在此，我们展示了一系列低成本的非共价稠环电子受体，其由通过非共价硫-氧相互作用锁定的梯状核心以及两侧的两个二氰基茚满酮吸电子基团组成。与类似的但未稠合的受体相比，梯状结构的存在显著拓宽了吸收至近红外区域。此外，分子内非共价相互作用的使用避免了共价稠环结构的繁琐合成，并显著降低了合成成本。优化后的太阳能电池展现出13.24%的出色效率。更重要的是，基于这些受体的太阳能电池表现出非常低的非辐射能量损失。这项研究表明，低成本的非共价稠环电子受体有望实现高效有机太阳能电池。
