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The desired diffusion of excitons towards the organic¨Corganic interface (process 2) poses stringent requirements on the thin-film morphology. Exciton diffusion lengths in polymeric and disordered molecular solids are typically in the range of a few nanometers or a few tens of nanometers, and increase to a few hundred nanometers for highly ordered crystalline samples.Consequently, the average spacing of organic heterojunctions should be on the length scale of the exciton diffusion lengths. This leads to a laterally structured architecture with vertically interdigitated separate phases, as shown schematically in Figure 10b, where every generated exciton should be able to diffuse towards an organic¨Corganic interface. In reality, the fabrication of such ideal structures is inherently difficult with both small-molecular and polymeric materials, in particular because of the small length scales involved. |
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nuptsww: ½ð±Ò+20, ·ÒëEPI+1 2013-09-29 20:43:20
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