Activated Singlet Exciton Fission in a Semiconducting Polymer

被引：145

作者：

Musser, Andrew J. ^{[1
]}

Al-Hashimi, Mohammed ^{[2
,4
]}

Maiuri, Margherita ^{[3
]}

Brida, Daniele ^{[3
]}

Heeney, Martin ^{[2
]}

Cerullo, Giulio ^{[3
]}

Friend, Richard H. ^{[1
]}

Clark, Jenny ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

[3] Politecn Milan, Dipartimento Fis, IFN CNR, I-20133 Milan, Italy

[4] Qatar Univ, Coll Arts & Sci, Dept Chem & Earth Sci, Doha, Qatar

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2013年 / 135卷 / 34期

基金：

英国工程与自然科学研究理事会;

关键词：

TRIPLET EXCITONS; SOLAR-CELLS; GENERATION; SPECTROSCOPY; RELAXATION; REGIOREGULARITY; EXCITATIONS; PENTACENE; VINYLENE); POLYENES;

D O I：

10.1021/ja405427j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Singlet exciton fission is a spin-allowed process to generate two triplet excitons from a single absorbed photon. This phenomenon offers great potential in organic photo-voltaics, but the mechanism remains poorly understood. Most reports to date have addressed intermolecular fission within small-molecular crystals. However, through appropriate chemical design chromophores capable of intramolecular fission can also be produced. Here we directly observe sub-100 Is activated singlet fission in a semiconducting poly-(thienylenevinylene). We demonstrate that fission proceeds directly from the initial 1B(u) exciton, contrary to current models that involve the lower-lying 2A(g) exciton. In solution, the generated triplet pairs rapidly recombine and decay through the 2A(g) state. In films, exciton diffusion breaks this symmetry and we observe long-lived triplets which form charge-transfer states in photovoltaic blends.

引用

页码：12747 / 12754

页数：8

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