Morphology control of organic crystals by single-molecule template method

2014 Fiscal Year Final Research Report

• Project/Area Number: 25620025
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Organic chemistry
• Research Institution: The University of Tokyo
• Principal Investigator: HARANO Koji 東京大学, 理学(系)研究科(研究院), 助教 (70451515)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 結晶成長 / 超分子化学 / 有機結晶 / 結晶多形 / ナノ材料

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.

Free Research Field

分子集合体科学