Elucidating structure-property relations under mechanical strain in organic semiconductors for device applications

2016 Fiscal Year Final Research Report

• Project/Area Number: 26246011
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied materials
• Research Institution: The University of Tokyo
• Principal Investigator: TAKEYA Junichi 東京大学, 大学院新領域創成科学研究科, 教授 (20371289)
• Co-Investigator(Kenkyū-buntansha): 宍戸 厚 東京工業大学, 資源化学研究所, 准教授 (40334536) ; 大島 義文 北陸先端科学技術大学院大学, マテリアルサイエンス研究科, 准教授 (80272699) ; 松井 弘之 東京大学, 新領域創成科学研究科, 助教 (80707357)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 高移動度有機半導体 / 単結晶有機薄膜 / 有機トランジスタ

Outline of Final Research Achievements

We have found that electrical conductivity (mobility) greatly changes with the application of external force to the organic semiconductor crystal, and proved that this phenomenon depends on crystal structure change due to the external force. The detailed correlation between the external stress and the structural property is analyzed by X-ray structural analysis, Hall effect measurement, temperature dependence measurement and calculation of molecular oscillation amplitude. It turned out that the effect is dominantly attributed to reduced molecular vibration rather than t shrinking the intermolecular distance. Based on the obtained physical property, we developed a technology to build a strain sensor with the single-crystal semiconductor films. We found that the sensitivity is more than one-order-of-magnitude higher than conventional devices, indicating definite advantage of the present organic single-crystal strain sensors.

Free Research Field

有機・分子エレクトロニクス 、有機半導体、有機薄膜単結晶、分子素子材料、電子デバイス・集積回路