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首页> 外文期刊>Advanced Functional Materials >Conjugated Block Copolymers as Model Systems to Examine Mechanisms of Charge Generation in Donor- Acceptor Materials
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Conjugated Block Copolymers as Model Systems to Examine Mechanisms of Charge Generation in Donor- Acceptor Materials

机译：共轭嵌段共聚物作为模型系统，以检查供体-受体材料中电荷产生的机理

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摘要

Fully conjugated donor-acceptor block copolymers are established as model systems to elucidate fundamental mechanisms of photocurrent generation in organic photovoltaics. Using analysis of steady-state photoluminescence quenching, exciton dissociation to a charge transfer state within individual block copolymer chains is quantified. By making a small adjustment to the conjugated backbone, the electronic properties are altered enough to disrupt charge transfer almost entirely. Strong intermolecular coupling of the electron donor is introduced by synthesizing block copolymer nanoparticles. Transient absorption spectroscopy is used to monitor charge generation in block copolymer isolated chains and nanoparticles. While efficient charge transfer is observed in isolated chains, there is no indication of complete charge separation. In the nanoparticles, long-lived polarons are observed as early as approximate to 15 ns. Thus, aggregation of electron donors can facilitate efficient charge generation.
机译：建立完全共轭的供体-受体嵌段共聚物作为模型系统，以阐明有机光伏中产生光电流的基本机理。使用稳态光致发光猝灭的分析，可量化激子在单个嵌段共聚物链中解离为电荷转移态的过程。通过对共轭主链进行少量调整，可以改变电子性质，从而几乎完全破坏电荷转移。通过合成嵌段共聚物纳米粒子引入了电子供体的强分子间偶联。瞬态吸收光谱法用于监测嵌段共聚物分离的链和纳米颗粒中的电荷产生。尽管在分离的链中观察到有效的电荷转移，但没有迹象表明完全电荷分离。在纳米颗粒中，早在约15 ns观察到长寿命极化子。因此，电子给体的聚集可以促进有效的电荷产生。

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