Basic Study on Photocurable Liquid Crystal / C8-BTBT Mixtures for High-Mobility Organic Semiconductors
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Recently, organic semiconductors have been attracting extensive interests such as an active layer for thin film transistors. The electric conduction in organic semiconductor is governed by hopping conduction because of crystallographic directions with especially weak &pai;-electronic interactions. Therefore, the mobility is improved as the molecular orientation is improved. We have tried to obtain the uniform molecular orientation of photocurable mesogenic monomers and solidify the orientational structure by irradiation of UV light. Furthermore, we have examined the charge carrier transport properties of the solidified samples and researched the influence of the molecular orientation on the carrier transport. As a result, the textures observed at 55 and 30 <sup>o</sup>C before the photocure, show non-uniform structures. It is guessed that the compatibility of UCL-001 with C8-BTBT is low, and then, the mixture of UCL-001 and C8-BTBT were phase-separated. On the other hand, in the polymer concentration of 75 wt%, the isotropic phase structure can be solidified by photocuring at 100<sup>o</sup>C. In the charge carrier transport properties, the hole mobility of the solidified samples cannot be determined. However, from the viewpoint of the quantity of photocurrent, the sample photocured at 55<sup>o</sup>C shows the most quantity of photocurrent. It is confirmed that the charge carrier transport properties depend on the molecular orientation, and in order to obtain the high mobility, the uniform orientation is important.
- Journal of Photopolymer Science and Technology
Journal of Photopolymer Science and Technology 29(2), 327-330, 2016
The Society of Photopolymer Science and Technology(SPST)