轨道能级差
噻吩
噻唑
带隙
共轭体系
氟
共聚物
化学
卤素
聚合物太阳能电池
有机太阳能电池
材料科学
聚合物
光化学
结晶学
立体化学
分子
有机化学
光电子学
烷基
作者
Jun Luo,Shichu Peng,Jiabing Zhang,Yaocheng Jin,Dianpeng Chen,Yingxiao Mu,Liangang Xiao,Dehua Hu,Qingdan Yang,Shaomin Ji,Yong Min,Yanping Huo
标识
DOI:10.1016/j.orgel.2023.106860
摘要
Two wide bandgap copolymers based on benzo[d]thiazole unit, named PBTz-F and PBTz-Cl, containing benzo[1,2-b:4,5-b′]dithiophene (BDT) as electron donor units are developed. The resulting polymers lower the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels via substituting halogen atoms (fluorine or chlorine atoms) on the thiophene side chain of the BDT unit. However, the chlorine atom in the copolymers has a stronger capacity to downshift energy levels than the fluorine atom. PBTz-Cl:Y6-BO-based OSC delivers a higher PCE of 12.36% with simultaneously enhanced VOC of 0.90 V, JSC of 22.78 mA cm−2, and FF of 0.61 when compared to that based on PBTz-F:Y6-BO (PCE = 11.38%, JSC = 22.48 mA cm−2, VOC = 0.88 V, and FF = 0.58) due to its stronger absorption, higher charge mobilities, deeper HOMO energy level, and favorable blend film morphology. These results emphasized that chlorination is a practical strategy to obtain high PCE and BTz-based polymers are potential donor candidates for high-performance OSCs.
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