摘要
单线态裂分是指有机材料在光激发后,从一个单重态激子转变为两个三重态激子的光物理过程。该过程有望提高光电转换效率,因而受到了广泛的关注。研究发现单线态裂分中存在一个关键的中间态,而如何构建中间态的波函数则是重要的挑战。本文着重介绍了双激发态波函数构建的两类理论模型,而后讨论了振动、轨道和自旋相互作用对中间态形成和解离的影响。最后总结了进一步的理论研究将面临的挑战。
Singlet fission is a photophysical process in organic materials where a photoexcited singlet exciton splits into two triplet excitons.This process has gained a lot of interest in the past decade for enhancing the efficiency of photovoltaic conversion.Precious work identified a crucial intermediate state in singlet fission,and the construction of the wave function for this correlated triplet-pair state poses a significant challenge.This article serves as a comprehensive introduction to theoretical models designed for constructing the wave function of the correlated triplet-pair.Subsequently,we delve into an exploration of the intricate effects of vibrational,orbital,and spin interactions on the formation and dissociation of the intermediate state.Finally,we conclude with a succinct summary of the challenges anticipated to shape the landscape of future theoretical research in this field.
作者
童磊
张春峰
TONG Lei;ZHANG Chun-feng(School of Physics,Nanjing University,Nanjing 210093;Nantong Institute of Material Engineering Technology,Nanjing University,Nantong 226001)
出处
《物理学进展》
北大核心
2024年第3期112-122,共11页
Progress In Physics
基金
自然科学基金(Grant NOs.22225305)
重点研发(2022YFB3206900)
南通市民生计划项目支持(MS22022066)。
关键词
单线态裂分
双激发态
电子态耦合
交换相关能
singlet fission
correlated triplet-pair state
electronic coupling
triplet-triplet exchange interaction