共轭体系
化学
聚合物
聚合物太阳能电池
苝
堆积
有机太阳能电池
量子效率
接受者
能量转换效率
太阳能电池
光化学
高分子化学
光电子学
化学工程
材料科学
有机化学
分子
工程类
物理
凝聚态物理
作者
Guitao Feng,Junyu Li,Fallon J. M. Colberts,Mengmeng Li,Jianqi Zhang,Fan Yang,Yingzhi Jin,Fengling Zhang,René A. J. Janssen,Cheng Li,Weiwei Li
摘要
A series of "double-cable" conjugated polymers were developed for application in efficient single-component polymer solar cells, in which high quantum efficiencies could be achieved due to the optimized nanophase separation between donor and acceptor parts. The new double-cable polymers contain electron-donating poly(benzodithiophene) (BDT) as linear conjugated backbone for hole transport and pendant electron-deficient perylene bisimide (PBI) units for electron transport, connected via a dodecyl linker. Sulfur and fluorine substituents were introduced to tune the energy levels and crystallinity of the conjugated polymers. The double-cable polymers adopt a "face-on" orientation in which the conjugated BDT backbone and the pendant PBI units have a preferential π-π stacking direction perpendicular to the substrate, favorable for interchain charge transport normal to the plane. The linear conjugated backbone acts as a scaffold for the crystallization of the PBI groups, to provide a double-cable nanophase separation of donor and acceptor phases. The optimized nanophase separation enables efficient exciton dissociation as well as charge transport as evidenced from the high-up to 80%-internal quantum efficiency for photon-to-electron conversion. In single-component organic solar cells, the double-cable polymers provide power conversion efficiency up to 4.18%. This is one of the highest performances in single-component organic solar cells. The nanophase-separated design can likely be used to achieve high-performance single-component organic solar cells.
科研通智能强力驱动
Strongly Powered by AbleSci AI