Influence of Molecular Stacking Pattern on Excited State Dynamics of Copper Phthalocyanine Films  

分子堆积方式对酞菁铜薄膜激发态动力学的影响

作　　者：Meng Li Wen-hui Li Yu-jie Hu Jing Leng Wen-ming Tian Chun-yi Zhao Jun-xue Liu Rong-rong Cui Sheng-ye Jin Chuan-hui Cheng Shu-lin Cong 李萌;李文慧;扈玉杰;冷静;田文明;赵春一;刘俊学;崔荣荣;金盛烨;程传辉;丛书林(大连理工大学物理学院,大连116024;中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023)

机构地区：[1]School of Physics,Dalian University of Technology,Dalian 116024,China [2]State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China

出　　处：《Chinese Journal of Chemical Physics》2022年第6期900-906,I0073,共8页化学物理学报（英文）

基　　金：supported by the Open Fund of the State Key Laboratory of Molecular Reaction Dynamics at Dalian Institute of Chemical Physics,Chinese Academy of Sciences(No.SKLMRD-K202108)。

摘　　要：Photophysical processes occurring within organic semiconductors is important for designing and fabricating organic solar cells.Copper phthalocyanine(CuPc)is a typical electron acceptor.In this work,the triplet exciton lifetime is prolonged by altering the molecular stacking pattern of the CuPc film.For CuPc thin films,the excited state decays are mainly determined by the triplet-triplet annihilation process.The ultrafast transient absorption measurements indicate that the primary annihilation mechanism is one-dimensional exciton diffusion collision destruction.The decay kinetics show a clearly time-dependent annihilation rate constant withγ∝t^(-1/2).Annihilation rate constants are determined to beγ0=(2.87±0.02)×10^(-20)cm^(3)·s^(-1/2)and(1.42±0.02)×10^(-20)cm^(3)·s^(-1/2)for upright and lyingdown configurations,respectively.Compared to the CuPc thin film with an upright configuration,the thin film with a lying-down configuration shows longer exciton lifetime and higher absorbance,which are beneficial to organic solar cells.The results in this work have important implications on the design and mechanistic understanding of organic optoelectronic devices.

关 键 词：CUPC PHOTOPHYSICS Excited state Triplet-triplet annihilation Organic solar cell 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]