有机太阳能电池
偶极子
材料科学
光伏系统
有机半导体
能量转换效率
分子内力
混溶性
光电子学
化学物理
化学
有机化学
聚合物
电气工程
工程类
复合材料
作者
Xiaofei Ji,Ting Wang,Qiang Fu,Dongxue Liu,Ziang Wu,Mingtao Zhang,Han Young Woo,Yongsheng Liu
标识
DOI:10.1002/marc.202300213
摘要
Abstract The dielectronic constant of organic semiconductor materials is directly related to its molecule dipole moment, which can be used to guide the design of high‐performance organic photovoltaic materials. Herein, two isomeric small molecule acceptors, ANDT‐2F and CNDT‐2F, are designed and synthesized by using the electron localization effect of alkoxy in different positions of naphthalene. It is found that the axisymmetric ANDT‐2F exhibits a larger dipole moment, which can improve exciton dissociation and charge generation efficiencies due to the strong intramolecular charge transfer effect, resulting in the higher photovoltaic performance of devices. Moreover, PBDB‐T:ANDT‐2F blend film exhibits larger and more balanced hole and electron mobility as well as nanoscale phase separation due to the favorable miscibility. As a result, the optimized device based on axisymmetric ANDT‐2F shows a J SC of 21.30 mA cm −2 , an FF of 66.21%, and a power conversion energy of 12.13%, higher than that of centrosymmetric CNDT‐2F‐based device. This work provides important implications for designing and synthesizing efficient organic photovoltaic materials by tuning their dipole moment.
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