Investigation on Excited-State Photophysical Characteristics of Low Bandgap Polymer APFO3  

窄带系聚合物APFO3的激发态光物理特性

作　　者：曲丽丽[1] 王英惠[1,2] 康智慧[1] 马於光[2] 张汉壮[1] 

机构地区：[1]吉林大学物理学院,飞秒激光实验室,长春130012 [2]吉林大学超分子结构与材料国家重点实验室,长春130012

出　　处：《Chinese Journal of Chemical Physics》2014年第1期109-114,I0004,共7页化学物理学报（英文）

基　　金：ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.21103161 and No.11274142） and the China Postdoctoral Science Foundation （No.2011M500927）.

摘　　要：The excited state photophysics of low bandgap polymer APFO3 has been investigated in detail. The chemical calculations confirm that the intrachain charge transfer （ICT） may occur after photo-excitation and is mainly responsible for the first absorption band. The transient absorption results confirm that ICT indeed exists and competes with the vibra-tional relaxation at the same time, when APFO3 is in a monodisperse system. This ICT process would disappear due to the influence of interchain interaction when APFO3 is in the condensed phase, where the exciton decay would be dominant in the relaxation process after photoexcitation. The photoexcitation dynamics of APFO3 film blending with PC61BM are presented, which shows that the exciton may be dissociated completely as the percentage of PC61BM reaches ～50%. Meanwhile, the photovoltaic performance based on blend het-erojunction shows that the increase of photocurrent is little if the percentage of PC61BM exceeds ～50%. Overall, the present study has covered several fundamental processes taking place in the APFO3 polymer.

关 键 词：Conjugated polymer Transient absorption Intrachain charge transfer 

分 类 号：O6[理学—化学]