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Updated: Mar 9, 2026

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Published on: May 27, 2020
Evaluating Electronic Couplings for Excited State Charge Transfer Based on Maximum Occupation Method ΔSCF
Junzi Liu1, Yong Zhang2, Peng Bao1
1Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China.
Abstract:
Electronic couplings of charge-transfer states with the ground state and localized excited states at the donor/acceptor interface are crucial parameters for controlling the dynamics of exciton dissociation and charge recombination processes in organic solar cells. Here we propose a quasi-adiabatic state approach to evaluate electronic couplings through combining maximum occupation method (mom)-ΔSCF and state diabatization schemes. Compared with time-dependent density functional theory (TDDFT) using global hybrid functional, mom-ΔSCF is superior to estimate the excitation energies of charge-transfer states; moreover it can also provide good excited electronic state for property calculation. Our approach is hence reliable to evaluate electronic couplings for excited state electron transfer processes, which is demonstrated by calculations on a typical organic photovoltaic system, oligothiophene/perylenediimide complex.
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