Elicitation and molecular control of ballistic conduction in organic semiconductors

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K21966
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 21:Electrical and electronic engineering and related fields
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Unuma Takeya 長岡技術科学大学, 工学研究科, 准教授 (20456693)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: 共役ポリマー / テラヘルツ応答 / ナノセルロース / シリコーン / コンポジット薄膜

Outline of Final Research Achievements

To elicit ballistic conduction in organic semiconductors, we designed a measurement system triggered by femtosecond optical pulses and also fabricated polymer-based films intended for the efficient creation of carriers and the formation of suitable conduction paths. It turned out that measurable terahertz emission due to the ballistic acceleration of carriers excited by optical pulses under high in-plane bias voltage needs further optimization of the film thickness and the excitation spot size depending on the choice of excitation wavelength. In addition, we offered the possibility of producing conduction paths protected against degradation in transparent polymeric host materials.

Free Research Field

半導体物性

Academic Significance and Societal Importance of the Research Achievements

軽量・フレキシブル・低コストなど多くの利点を持つ有機薄膜デバイスについて，苦手とされてきた高速動作につながるバリスティック伝導に着目し，当該現象の顕在化と制御に挑戦した。フェムト秒光パルスを用いた観測手法におけるポイントを検証した一方，伝導経路形成の試行錯誤の過程では伸縮性を持つ透明静電防止膜などへ応用可能な試料も得られた。以上のように，本成果には有機半導体に関する複数方面への芽生えとしての意義がある。