Functionalized ligands of colloidal nano-dots for application to thin-film devices

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05986
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Wakayama University
• Principal Investigator: Tanaka Ichiro 和歌山大学, システム工学部, 教授 (60294302)
• Co-Investigator(Renkei-kenkyūsha): Kamiya Itaru 豊田工業大学, 工学(系)研究科(研究院), 教授 (10374018)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: コロイダルナノドット / 半導体 / 配位子 / 薄膜 / トランジスタ / キャリア移動度

Outline of Final Research Achievements

Semiconductor colloidal nano-dots (CND) are expected to be useful for low-cost thin-film devices. However, they are highly insulating and not suitable for electronic devices as they are. In this study, we increased the conductivity of CND films and fabricated thin film transistors (TFTs). At first, we tried to exchange insulating ligands with more conductive ones, but it was not successful because it was difficult to obtain well dispersed CND solution. We therefore removed ligand molecules from CNDs using ammonium sulfide solution. The CND films formed by horizontal lifting method were dipped in an ammonium sulfide solution for 2 s to eliminate ligand molecules. Then, source and drain electrodes were deposited to fabricate TFTs. Finally, the carrier mobility was measured with a semiconductor parameter analyzer; it reached 0.0011 cm2/Vs after the fabrication process was improved.

Free Research Field

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