Abstract
The photocarrier transport property of the three-generation dendrimer, which is composed of phenylene-vinylene as the dendron group and triphenylamine as the surface group G3D3-PV(TPA), was studied by the time of flight (TOF) method using a sandwich-type cell of indium-tin-oxide (ITO)/G3D3-PV(TPA)/Mg-Al. The photocurrent decay shows that hole transport occurs stronger than electron transport, and dispersive transport is observed in the dendrimer film. The mobility at 25 °C exhibits negative electric field dependence, and the intrinsic mobility at zero electric field is 7.1 × 10−5 cm2/(V.s). This is faster than that of linear poly(p-phenylene-vinylene). Besides this, the result is one order smaller than that of poly(3-hexylthiophene), but faster than those of poly(3-dodecylthiophene) and poly(3-octadecylthiophene). The result indicates that one of the important parameters for the carrier transport is the average distance between π-conjugated molecules. The fact that the carrier hopping of the G3D3-PV(TPA) dendrimer occurs effectively implies the structure would be a disk shape since the phenylene-vinylene dendron sites of the different dendrimer molecule are estimated to be close to each other.
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Mizusaki, M., Yamahara, M., Yamada, Y. et al. Photocarrier Transport Property of Phenylene-vinylene Dendrimer Studied by Time-of-Flight Method. Polym J 41, 195–200 (2009). https://doi.org/10.1295/polymj.PJ2008226
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DOI: https://doi.org/10.1295/polymj.PJ2008226