Fundamental development for realization of high-performance organic transistors based on molecular orientation and interface control

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02171
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21050:Electric and electronic materials-related
• Research Institution: Kobe University
• Principal Investigator: Kitamura Masatoshi 神戸大学, 工学研究科, 教授 (10345142)
• Co-Investigator(Kenkyū-buntansha): 石田 謙司 神戸大学, 工学研究科, 教授 (20303860) ; 服部 吉晃 神戸大学, 工学研究科, 助教 (90736654)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 薄膜トランジスタ / 有機半導体 / 単分子膜 / 閾値電圧

Outline of Final Research Achievements

For improvement of the characteristics of organic transistors, we worked on the control of the gate insulator surface and the control of the organic semiconductor-metal interface. Regarding the control of the insulating film surface, the organic monolayer was appropriately surface-treated to enable the film formation process by the coating process, and the spin coating method achieved mobilities exceeding 4 cm2 / Vs. Regarding the control of the organic semiconductor-metal interface, we clarified the relationship between the organic monolayer and the work function, and found the organic monolayer appropriate for improvement of the characteristics in organic transistors. Regarding the control of the gate insulator surface, we reproduced the threshold voltage control by the surface treatment, and successfully estimated the density of the energy level generated by the treatment.

Free Research Field

半導体デバイス

Academic Significance and Societal Importance of the Research Achievements

有機トランジスタの移動度は，高いものでは 10 cm2 V-1 s-1 に達し，移動度だけを見ると液晶ディスプレイの画素回路として実用化が始まった酸化物トランジスタの移動度に匹敵する．フレキシブルデバイスへの応用で注目される有機トランジスタであるが，性能面だけを見ても，アモルファスシリコントランジスタにとって代わる十分なポテンシャルがある．ディスプレイ応用に加え，フレキシブル回路への応用も検討されている．実用化に向けた課題は多いが，本研究により有機トランジスタの特性向上や実用化に向けた有益な知見が得られた．