材料科学
富勒烯
有机太阳能电池
偶极子
力矩(物理)
分子间力
光伏系统
化学物理
活动层
跃迁偶极矩
分子
能量转换效率
光电子学
纳米技术
图层(电子)
有机化学
聚合物
复合材料
物理
薄膜晶体管
生物
化学
经典力学
生态学
作者
Zi‐Hao Xia,Jinsheng Zhang,Xiang Gao,Wei Song,Jinfeng Ge,Lin Xie,Xiaoli Zhang,Zhitian Liu,Ziyi Ge
标识
DOI:10.1021/acsami.1c02652
摘要
Modifying molecular conjugation has been demonstrated as an effective strategy to enhance the photovoltaic performance of the non-fullerene small molecule acceptors (SMAs), which would regulate the molecular packing and nanoscale morphology in the active layer of organic solar cells (OSCs). Here, two novel SMAs PTIC-4Cl and PT2IC-4Cl are designed and synthesized by expanding the core unit of TB-4Cl in one or two directions. The effects of how to expand the conjugation length on the absorption property, energy levels, dipole moment, and solubility are studied via theoretical calculation and experiments. Compared to PT2IC-4Cl, PTIC-4Cl with a more asymmetric structure exhibits the larger dipole moment and enhanced intermolecular packing. The PTIC-4Cl-based OSCs exhibit a favorable morphology and balanced charge transport, thereby leading to the highest power conversion efficiencies. In addition, PTIC-4Cl-based devices show outstanding thermal and air stability. These results reveal that fine-tuning the dipole moment via rationally expanding the conjugation in asymmetric A-D1A′D2-A-type non-fullerene acceptors is critical to achieve high-performance OSCs.
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