Excited-state structural relaxation and exciton delocalization dynamics in linear and cyclic π-conjugated oligothiophenes,Chemical Society Reviews

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Excited-state structural relaxation and exciton delocalization dynamics in linear and cyclic π-conjugated oligothiophenes
Chemical Society Reviews ( IF 40.4 ) Pub Date : 2018-05-08 00:00:00 , DOI: 10.1039/c7cs00605e
Kyu Hyung Park _{1,

2,

3,

4} , Woojae Kim _{1,

2,

3,

4} , Jaesung Yang _{2,

4,

5,

6} , Dongho Kim _{1,

2,

3,

4}

Affiliation

π-Conjugated oligothiophene is considered a chain segment of its polymeric counterpart, whose size and shape can be precisely controlled. Because of its simplified structure, it is possible to understand complex excited-state dynamics of the π-conjugated polymers by employing a bottom-up approach. We review theoretical and experimental aspects of π-conjugated oligothiophenes by summarizing recent works employing time-resolved spectroscopy. The extent of exciton delocalization, which is a prerequisite to efficient charge generation at organic heterojunctions, is described sequentially in model linear and cyclic oligothiophenes, and their analogues. The heterogeneous nature of these systems is highlighted by illustrating the results at both ensemble and single-molecule levels. Exciton dynamics that arise in the polymers are also covered and the signifcance of exciton and charge delocalization in photovoltaic materials is highlighted.

中文翻译：

线性和环状π共轭低聚噻吩的激发态结构弛豫和激子离域动力学

π-共轭低聚噻吩被认为是其聚合物对应物的链段，其大小和形状可以精确控制。由于其简化的结构，可以通过采用自下而上的方法来了解π共轭聚合物的复杂激发态动力学。我们通过总结使用时间分辨光谱学的最新著作来回顾π-共轭低聚噻吩的理论和实验方面。激子离域化的程度是有效的在有机异质结上产生电荷的先决条件，在模型线性和环状低聚噻吩及其类似物中依次进行了描述。通过说明整体和单分子水平的结果，突出了这些系统的异构性质。

更新日期：2018-05-08

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