Improvement of polymer-based organic transistor performance by thin-film formation techniques utilizing liquid crystalline nature

2017 Fiscal Year Final Research Report

• Project/Area Number: 25286045
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Applied materials
• Research Institution: National Institute for Materials Science
• Principal Investigator: Sakamoto Kenji 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主席研究員 (00222000)
• Co-Investigator(Renkei-kenkyūsha): YASUDA Takeshi 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主幹研究員 (30380710)
• Research Collaborator: BULGAREVICH Kirill ; DEGUCHI Yu
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 有機トランジスタ / 有機半導体 / 液晶性 / 光配向膜 / フロー・コーティング / 配向制御 / LB膜

Outline of Final Research Achievements

To improve the performance of polymer-based organic field-effect transistors (OFETs) and reduce the device-to-device variation, we have developed coating methods of high mobility organic semiconductors with capability of controlling molecular orientation. We established "self-assisted flow coating (SAFC)" as a scalable coating method that can apply to hydrophobic (lyophobic) gate dielectric surfaces, which induce edge-on orientation of polymeric organic semiconductors. Using SAFC, we succeeded in fabricating arrays of polymer-based OFETs that show a field-effect mobility comparable to that of a-Si based FETs and the device-to-device variation of less than 3%. Furthermore, we developed alignment layers to induce high in-plane orientational order of the backbone structure of polymeric organic semiconductor. By combined use of a flow coating method and the alignment layer, we succeeded in fabricating highly oriented polymeric organic semiconductor thin films.

Free Research Field

有機デバイス・液晶