Control of electronic properties of organic semiconductor thin films by adjusting their structure at the interface with conductive substrate

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410093
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Kyoto University
• Principal Investigator: Sato Naoki 京都大学, 化学研究所, 教授 (10170771)
• Co-Investigator(Kenkyū-buntansha): MURDEY Richard 京都大学, 化学研究所, 助教 (20447931)
• Co-Investigator(Renkei-kenkyūsha): YOSHIDA Hiroyuki 京都大学, 化学研究所, 助教 (00283664)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 有機エレクトロニクス / 有機半導体 / 薄膜 / 電極界面 / 構造 / 電子構造 / 電荷トラップ / 光伝導

Outline of Final Research Achievements

With the idea of elucidating basic problems common to various electronic devices of organic semiconductors toward further development of organic electronics, we investigated the characteristics of structure and electronic structure in organic semiconductor thin films and at their interface with conductive substrates, using chiefly our unique method for in situ observation of conductivity and photoconductivity of a thin film in preparation onto a substrate under ultrahigh vacuum. Then, we disclosed examining correlation between energy parameters for the electrode and the film was insufficient to control performance of such devices and demonstrated the importance of understanding and regulating the condition at the interface as well as charge-carrier trap states in the film. Moreover, it turned out that intrinsic or extrinsic photoconductivity of organic semiconductors is selectively observed by regulating electronic structures around the interface between the film and the electrode.

Free Research Field

有機物性化学、物理化学