2022 Fiscal Year Final Research Report

Work function measurements of printed silver electrode for control of metal/semiconductor contact performance

Research Project

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Project/Area Number	18K14131
Research Category	Grant-in-Aid for Early-Career Scientists
Allocation Type	Multi-year Fund
Review Section	Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research Institution	Osaka Research Institute of Industrial Science and Technology
Principal Investigator	Masashi Saitoh 地方独立行政法人大阪産業技術研究所, 森之宮センター, 主任研究員 (70611317)
Project Period (FY)	2018-04-01 – 2023-03-31
Keywords	銀ナノ粒子 / ナノインク / 印刷エレクトロニクス / ショットキーバリアダイオード / 仕事関数 / ケルビンプローブ力顕微鏡
Outline of Final Research Achievements	Understanding and engineering of the junctions formed at the contact interface between metallic electrodes and semiconductor materials are key elements in modern electronic devices. Recently, as one of alternative to traditional technology, the printed electronics has been emerged for making the practical devices using conductive inks. However, despite much effort over the decades, the junctions formed at the contact between a printed electrode and a semiconductor remains a crucial challenge. In this study, the fabrication of the Schottky barrier diode with the silver nanoparticulate electrode was demonstrated, where the silver electrode was formed through the printing of the silver nanoink on p-type silicon. For understanding of the interface between silver electrode and p-type silicon, I-V measurements, SEM and Kelvin probe force microscopy measurements were demonstrated to investigate the possible mechanism of the increment of the Schottky barrier height in the diodes.
Free Research Field	機能性材料科学
Academic Significance and Societal Importance of the Research Achievements	本研究成果の学術的意義は、印刷エレクトロニクスを用いてダイオードを作製し、その特性評価を行う中で、ナノインクから作製した金属電極の仕事関数がバルク金属と異なる値を有していることを明らかにした点にある。また、産業界で注目されている印刷エレクトロニクス技術の実用化に向けて、印刷エレクトロニクスで作製したデバイスの評価方法を確立した点は、材料メーカーと装置関連メーカー、研究機関も交えた連携を加速させ、印刷エレクトロニクスを基盤技術とした新たな研究展開につながる点で社会体意義がある。