Exciton Structure and Dynamics in Solution Aggregates of a Low-Bandgap Copolymer

被引：18

作者：

Guo, Zhi ^{[1
,2
]}

Lee, Doyun ^{[3
]}

Gao, Haifeng ^{[3
]}

Huang, Libai ^{[1
,4
]}

机构：

[1] Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA

[2] Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 USA

[3] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA

[4] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2015年 / 119卷 / 24期

关键词：

HETEROJUNCTION SOLAR-CELLS; CHARGE-TRANSFER; EFFICIENCY ENHANCEMENT; NANOSCALE MORPHOLOGY; CONJUGATED POLYMERS; CHAIN CONFORMATION; FILM MORPHOLOGY; DISSOCIATION; SEPARATION; PERFORMANCE;

D O I：

10.1021/jp511949e

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, we elucidate exciton structure, dynamics, and charge generation in the solution phase aggregates of a low-bandgap donor acceptor polymer, poly(4,8-bis-alkyloxybenzo [1,2-b:4,5-b']-dithioph ene-2,6-diyl-alt-(alkylthieno [3,4-b]thiophene-2carboxylate) -2,6-diyl (PBDTTT). The polymer aggregates in the solution phase serve as precursors for thin film morphologies. We have identified intrachain and interchain exciton transitions and resolved their relaxation pathways by comparing excitons in solution aggregates to those in isolated polymer chains. Hot intrachain excitons have led to the generation of stabilized interchain charge-separated states in solution aggregates, which could serve as the intermediate state to the hot exciton charge separation in bulk heterojunctions.(BHJs). These results have important implications for controlling morphology dependent exciton dynamics in solution processed BHJs.

引用

页码：7666 / 7672

页数：7

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