苝酰亚胺受体的聚集形态对有机太阳电池中激子过程与电子传输的影响  

Aggregation Morphology of Perylene Bisimide Acceptors and the Role onExciton Processes and Electron Transport in Organic Solar Cells

作　　者：张煜[1] 陈介焕 周家东 刘琳琳[1] 解增旗[1] ZHANG Yu;CHEN Jiehuan;ZHOU Jiadong;LIU Linlin;XIE Zengqi(State Key Laboratory of Luminescent Materials and Devices,Institute of Polymer Optoelectronic Materials and Devices,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学发光材料与器件国家重点实验室,高分子光电材料及器件研究所,广州510640

出　　处：《高等学校化学学报》2023年第9期1-12,共12页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21975076,52003089,52103206);广东省分子聚集发光重点实验室(批准号:2019B030301003);广州市科技计划项目(批准号:202102020561,202102020401)资助.

摘　　要：末端烷基链分叉位置对苝酰亚胺(PBI)线性二联体的堆积模式具有显著影响,进而影响激子过程与载流子传输.二联体两端烷基链分叉位点紧靠苝酰亚胺能够抑制分子长程有序堆积,形成具有较少能量陷阱的无定形聚集态;而两端烷基链分叉位点远离苝酰亚胺则导致多种聚集结构共存,分子间强π-π相互作用位点成为能量陷阱.结果表明, PBI受体的聚集方式对有机太阳电池的性能产生重要影响,需要尽量减少活性层中的多种聚集结构共存以免引起激子解离受限以及载流子传输迟滞.Head-to-tail bonded perylene bisimide(PBI)dyads with different branched alkyl chains substituted at the terminal imide position show various stacking modes,which results in different effects on the excitonic processes and electron transportation.The dyad bearing branched alkyl chains with the branching sites close to the imide positions forms homogeneously amorphous state,while with branching sites being away from the imide positions the PBI core tend to stack with multiple modes.There are fewer energy trapping sites in the homogeneously amorphous state,but in the multiple stacking system the strongπ-πinteractions give more trapping sites.Our study demonstrates that the aggregation state of PBI-based acceptors plays an important role in the performances of organic solar cells(OSCs).Multiple stacking needs to be diminished to avoid the constrained exciton dissociation and retarded charge transport in the active layer.

关 键 词：苝酰亚胺 无定形态 多种堆积共存 有机太阳电池 

分 类 号：O622[理学—有机化学]