噻吩
偶极子
有机太阳能电池
材料科学
能量转换效率
退火(玻璃)
轨道能级差
分子
开路电压
溶剂
力矩(物理)
三噻吩
有机化学
光电子学
电压
聚合物
化学
物理
复合材料
经典力学
量子力学
作者
Jeremy J. Intemann,Kai Yao,Fazhu Ding,Yunxiang Xu,Xukai Xin,Xiaosong Li,Alex K.‐Y. Jen
标识
DOI:10.1002/adfm.201501600
摘要
Four new molecular donors are reported using a D1‐A‐D2‐A‐D1 structure, where D1 is an oligiothiophene, A is a benzothiadiazole, and D2 is indacenodithieno[3,2‐b]thiophene. The resulting materials provide efficiencies as high as 6.5% in organic solar cells, without the use of solvent additives or thermal/solvent annealing. A strong correlation between the end group (D1‐A) dipole moment and the fill factor (FF), mobility, and loss in the open‐circuit voltage ( V OC ) is observed. Indacenodithieno[3,2‐b]thiophene‐fluorobenzothiadiazole‐terthiophene (IDTT‐FBT‐3T) possesses the largest end group dipole moment, and in turn, has the highest mobility, FF, and power conversion efficiency in devices. It also has a similarly high V OC (0.95 V) to the other materials (0.93–0.99 V), despite possessing a much higher highest occupied molecular orbital (HOMO) energy level.
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