Photoinduced Charge Transfer in Donor-Bridge-Acceptor in One-and Two-photon Absorption: Sequential and Superexchange Mechanisms

被引:40
|
作者
Mu, Xijiao [2 ]
Wang, Xinxin [2 ]
Quan, Jun [1 ]
Sun, Mengtao [2 ]
机构
[1] Lingnan Normal Univ, Sch Phys Sci & Technol, Zhanjiang 524048, Peoples R China
[2] Univ Sci & Technol Beijing, Sch Math & Phys, Ctr Green Innovat, Adv Innovat Ctr Mat Genome Engn,Beijing Key Lab M, Beijing 100083, Peoples R China
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2020年 / 124卷 / 09期
基金
美国国家科学基金会;
关键词
DENSITY-FUNCTIONAL THEORY; OPTOELECTRONIC PROPERTIES;
D O I
10.1021/acs.jpcc.9b09995
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, the one- (OPA) and two-photon absorption (TPA) and transition characteristics of the porphyrin and fullerene donor-acceptor systems linked by thiophene oligomers are investigated theoretically. In the study of the transition characteristics of OPA and TPA, a combination of 2D and 3D visualization methods is used. During the OPA and TPA transitions of this D-A system, there is both superexchange charge transfer without thiophene oligomers and sequential charge transfer through thiophene oligomers. On this basis, there exist also charge recombination TPA excitations of the previous two kinds of charge transfer into an intrinsic process. The degree of polymerization of the thiophene oligomer significantly affects the efficiency of superexchange charge transfer and participates in excitation in units of quarter-thiophene. Finally, a method to enhance the charge transfer efficiency during TPA excitation is proposed, which is local excitation enhanced charge transfer excitation.
引用
收藏
页码:4968 / 4981
页数:14
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