Exciton Fission and Charge Generation via Triplet Excitons in Pentacene/C60 Bilayers
Organic photovoltaic devices are currently studied due to their potential suitability for flexible and large-area applications, though efficiencies are presently low. Here we study pentacene/C60 bilayers using transient optical absorption spectroscopy; such structures exhibit anomalously high quantu...
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| Veröffentlicht in: | Journal of the American Chemical Society 2010-09, Vol.132 (36), p.12698-12703 |
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| container_issue | 36 |
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| container_title | Journal of the American Chemical Society |
| container_volume | 132 |
| creator | Rao, Akshay Wilson, Mark W. B Hodgkiss, Justin M Albert-Seifried, Sebastian Bässler, Heinz Friend, Richard H |
| description | Organic photovoltaic devices are currently studied due to their potential suitability for flexible and large-area applications, though efficiencies are presently low. Here we study pentacene/C60 bilayers using transient optical absorption spectroscopy; such structures exhibit anomalously high quantum efficiencies. We show that charge generation primarily occurs 2−10 ns after photoexcitation. This supports a model where charge is generated following the slow diffusion of triplet excitons to the heterojunction. These triplets are shown to be present from early times ( |
| doi_str_mv | 10.1021/ja1042462 |
| format | Article |
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These triplets are shown to be present from early times (<200 fs) and result from the fission of a spin-singlet exciton to form two spin-triplet excitons. 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| source | MEDLINE; American Chemical Society Journals |
| subjects | Fullerenes - chemistry Naphthacenes - chemistry Quantum Theory |
| title | Exciton Fission and Charge Generation via Triplet Excitons in Pentacene/C60 Bilayers |
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