Singlet Exciton Dynamics in Conjugated Polymer Films

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  • 共役高分子における一重項励起子ダイナミクス
  • キョウヤク コウブンシ ニ オケル イチジュウコウレイキコ ダイナミクス

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<p>Conjugated polymers are key materials employed in organic optoelectronics such as organic photovoltaics. Upon photoexcitation, singlet excitons are generated first in conjugated polymers while free charge carriers are generated in inorganic semiconductors. Singlet excitons in conjugated polymers are coulombically bound electron-hole pairs and therefore cannot contribute to the photocurrent generation in themselves. To convert charge carriers, singlet excitons should diffuse into heterojunctions such as a donor/acceptor interface. Thus, it is of particular importance to evaluate the exciton diffusion dynamics and length accurately. Interestingly, a singlet exciton can split into two triplet excitons under certain conditions. This multiexciton generation is called singlet fission and has attracted currently increasing attention because it has potential to boost quantum efficiency up to 200%. In this article, we describe singlet exciton diffusion and singlet fission dynamics in conjugated polymer films.</p>

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