Chen Weikang, Jiang Deyao, Chen Renai, Li Sheng, George Thomas F
Department of Physics, Zhejiang Normal University, Jinhua 321004, Zhejiang, China.
Department of Physics, Fudan University, Shanghai 200433, China.
Polymers (Basel). 2016 Nov 30;8(12):414. doi: 10.3390/polym8120414.
In bulk heterojunction polymer solar cells, external photoexcitation results in localized excitons in the polymer chain. After hot exciton formation and subsequent relaxation, the dipole moment drives the electron to partially transfer to extended orbitals from the original localized ones, leading to self-delocalization. Based on the dynamic fluorescence spectra, the delocalization of excitons is revealed to be an intrinsic property dominated by exciton decay, acting as a bridge for the exciton to diffuse in the polymeric solar cell. The modification of the dipole moment enhances the efficiency of polymer solar cells.
在本体异质结聚合物太阳能电池中，外部光激发会在聚合物链中产生局域激子。在热激子形成并随后弛豫之后，偶极矩驱动电子从原来的局域轨道部分转移到扩展轨道，从而导致自离域。基于动态荧光光谱，激子的离域被揭示为一种由激子衰变主导的固有特性，它充当激子在聚合物太阳能电池中扩散的桥梁。偶极矩的改变提高了聚合物太阳能电池的效率。
