Fundamental study of polarity and screening charge effects of ferroelectric materials on pi conjugated materials for autonomous operational sensor application

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630138
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: National Institute for Materials Science
• Principal Investigator: Nagata Takahiro 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, MANA研究者 (10421439)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 強誘電体 / 表面電荷 / ナノ界面 / 焦電性 / π電子伝導

Outline of Final Research Achievements

Ferroelectric materials exhibit spontaneous polarization and surface screening charge without the application of an electric field due to a lack of inversion symmetry and ionic bonds. In this research, we demonstrated the resistivity control of π conjugated materials on a ferroelectric material: LiNbO3 (LN) by the spontaneous polarization and pyroelectricity, which can be applied to sensor applications. We also demonstrated the screening charge localization by using a Schottky contact with LN, suggesting that the LN surface harvests electric energy from the environment. By combining these results, we found the possibility of a new sensor device that can be operated autonomously without external electrical source.

Free Research Field

酸化物電子材料