Fluctuating exchange interactions enable quintet multiexciton formation in singlet fission

被引：43
作者：
Collins, Miles I. [1 ,2 ]
McCamey, Dane P. [1 ]
Tayebjee, Murad J. Y. [2 ]
机构：
[1] Univ New South Wales, Sch Phys, ARC Ctr Excellence Exciton Sci, Sydney, NSW 2052, Australia
[2] Univ New South Wales, Sch Photovolta & Renewable Energy Engn, Sydney, NSW 2052, Australia
来源：
JOURNAL OF CHEMICAL PHYSICS | 2019年 / 151卷 / 16期
关键词：
EXCITON-FISSION; ELECTRONIC-STRUCTURE; EFFICIENCY; EASYSPIN; BIPHENYL; MODEL;
D O I：
10.1063/1.5115816
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：
Several recent electron spin resonance studies have observed a quintet multiexciton state during the singlet fission process. Here, we provide a general theoretical explanation for the generation of this state by invoking a time-varying exchange coupling between pairs of triplet excitons and subsequently solving the relevant time-varying spin Hamiltonian for different rates at which the exchange coupling varies. We simulate experimental ESR spectra and draw qualitative conclusions about the adiabatic and diabatic transitions between triplet pair spin states. Published under license by AIP Publishing.
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页数：8
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