High-Performing Thin-Film Transistors in Large Spherulites of Conjugated Polymer Formed by Epitaxial Growth on Removable Organic Crystalline Templates

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• 作者：Jae Yoon Kim ; Da Seul Yang ; Jicheol Shin ; David Bilby ; Kyeongwoon Chung ; Hyun Ah Um ; Jaehee Chun ; Seungmoon Pyo ; Min Ju Cho ; Jinsang Kim ; Dong Hoon Choi
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：June 24, 2015
• 年：2015
• 卷：7
• 期：24
• 页码：13431-13439
• 全文大小：596K
• ISSN：1944-8252

文摘

Diketopyrrolopyrrole (DPP)-based conjugated polymer PDTDPPQT was synthesized and was used to perform epitaxial polymer crystal growth on removable 1,3,5-trichlorobenzene crystallite templates. A thin-film transistor (TFT) was successfully fabricated in well-grown large spherulites of PDTDPPQT. The charge carrier mobility along the radial direction of the spherulites was measured to be 5.46鈥?2.04 cm² V^鈥? s^鈥?, which is significantly higher than that in the direction perpendicular to the radial direction. The dynamic response of charge transport was also investigated by applying a pulsed bias to TFTs loaded with a resistor (鈭?0 M惟). The charge-transport behaviors along the radial direction and perpendicular to the radial direction were investigated by static and dynamic experiments through a resistor-loaded (RL) inverter. The RL inverter made of PDTDPPQT-based TFT operates well, maintaining a fairly high switching voltage ratio (V_out^ON/V_out^OFF) at a relatively high frequency when the source-drain electrodes are aligned parallel to the radial direction.