High-capacitance polyurethane ionogels for low-voltage operated organic transistors and pressure sensors
- Title
- High-capacitance polyurethane ionogels for low-voltage operated organic transistors and pressure sensors
- Author
- 김도환
- Issue Date
- 2020-11
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v. 8, no. 47, page. 17107-17113
- Abstract
- In this paper, we report a facile method to fabricate high-capacitance polyurethane ionogel-based bilayer dielectrics for low-voltage and high-performance pressure-sensitive top-gate organic thin-film transistors (OTFTs). These elastomeric bilayer dielectrics are made of a neat polyurethane top layer and a bottom ionogel layer composed of a polyurethane-ionic liquid gel prepared by a simple, cost-effective dissolution process. Utilizing the various formulated ionogels with different ionic contents, controlled high capacitance values between 10 and 30 mu F cm(-2) are achieved, which is attributed to the formation of a combined electric double layer and dipole polarization in the ionogel/polyurethane layers, respectively. Remarkably increased hole mobilities up to similar to 2 cm(2) V-1 s(-1) and a low operation voltage less than 6 V are achieved with a poly(9,9-dioctylfuorene-co-bithiophene) (F8T2) liquid-crystalline polymer semiconductor and by optimizing the ionic content at the bottom ionogel layer of the OTFTs. Additionally, the optimized F8T2 OTFTs show a low threshold voltage of -2 V, a high on/off ratio of similar to 10(5), and excellent operational stability. Finally, we investigate the pressure sensing properties of the OTFTs by applying pressure on top of the polyurethane ionogel-based bilayer gate dielectric. The OTFTs showed a pressure sensitivity of 0.12 kPa(-1) over a wide pressure range. This study demonstrates that employing a thin polyurethane overlayer on an ionogel dielectric is a simple and effective approach to enhance the interface contact for both printing and thermal top-gate electrode deposition for high-performance ionogel-based OTFTs and pressure sensors.
- URI
- https://pubs.rsc.org/en/content/articlelanding/2020/TC/D0TC02364Ghttps://repository.hanyang.ac.kr/handle/20.500.11754/172725
- ISSN
- 2050-7526; 2050-7534
- DOI
- 10.1039/d0tc02364g
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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