Development of novel organic devices by controlling dipole characteristics at the interface between organic semiconductors and oxide substrate

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13775
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Organic and hybrid materials
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Takimiya Kazuo 国立研究開発法人理化学研究所, 創発物性科学研究センター, グループディレクター (40263735)
• Co-Investigator(Renkei-kenkyūsha): NAKANO Masahiro 国立研究開発法人理化学研究所, 創発物性科学研究センター, 特別研究員 (80724822)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 自己組織化単分子膜 / 双極子モーメント / 界面電荷 / 両極性有機半導体 / 相補型インバータ / 有機太陽電池

Outline of Final Research Achievements

This project has aimed to improve organic devices by inserting self-assembled monolayer (SAM) in the interface between the oxide and semiconductors. The SAMs were designed to have large dipole moment, which enables to induce interface potential. The expected effect was observed when the SAMs were introduced between the Si/SiO2 substrate and ambipolar polymer semiconductor; depending on the surface potentials induced by SAMs, selective unipolarization either for hole or electron transport was achieved. Furthermore, by patterning two different SAMs on the substrate, CMOS-like inverters with ideal switching characteristics were obtained. The technique was further transferred into the fabrication of OPVs. Interestingly, depending on the SAMs, the device performances were largely altered. With the SAM enabling efficient electron collection, the overall performances of solar cells were improved, but with the SAM with opposite dipole moment, the device performances were greatly reduced.

Free Research Field

有機機能化学