期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 34, 页码 12747-12754出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja405427j
关键词
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资金
- EPSRC (UK) [EP/G060738/1]
- European Community [228334, PITN-GA-2009-238177]
- Royal Society
- Winton Programme for the Physics of Sustainability
- EPSRC [EP/G060738/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G060738/1] Funding Source: researchfish
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.
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