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- W2027862406 abstract "Relaxing in the sunlight. Long time-transient decays of photogenerated carriers in P3HT:PCBM blends for organic solar cells are interpreted in terms of the relaxation of hole carriers in a broad density of states. The after-pulse time-resolved microwave conductivity (TRMC) decays observed in P3HT:PCBM blends display a dependence on time close to t−β, independent of excitation intensity, in the 10 ns–1 μs range. This is explained in terms of the relaxation of carriers in a Gaussian density of states (DOS). The model is based on a demarcation level that moves with time by thermal release and retrapping of initially trapped carriers. The model shows that when the disorder is large the after-pulse decay of the type t−β is obtained, while at low disorder and large temperature the carrier distribution becomes independent of time. In the measurements different β values were observed depending on the solvent used for spin-coating: 0.4–0.6 for chlorobenzene and 0.3–0.4 for toluene. The model was applied to extract the shape of the DOS from the TRMC decays, giving a dispersion parameter of about 120 meV for blends with high P3HT content." @default.
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- W2027862406 date "2009-04-20" @default.
- W2027862406 modified "2023-10-18" @default.
- W2027862406 title "Relaxation of Photogenerated Carriers in P3HT:PCBM Organic Blends" @default.
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- W2027862406 doi "https://doi.org/10.1002/cssc.200900002" @default.
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