| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
The aim of this research is to control crystal structure and morphology by chemical design. We thus demonstrated the concept of controlled nucleation on functionalized surfaces to the examination on how the PEDOT:PSS, a commonly-used buffer material, interacts with the neighboring layer of p-type organic semiconductors in an organic photovoltaic device. SEM analysis of crystals and aggregates of organic donor compounds showed that PEDOT:PSS effectively nucleates the crystallization of the donor material on its surface to form a uniformly thick film with polycrystalline nature. In contrast, a graphitic surface cannot induce structural order of the donor molecules when coated onto it. This study demonstrates that interaction at the organic-organic interface dominates the nucleation and the growth of phase-separated structure in thin-film devices.
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