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Organic Electronic Devices
Gelatin-Hydrogel based Organic Electrochemical Transistors and their Integrated Logic Circuits Young Jin Jo, Kiyoon Kwon, Zia Ullah Khan, Xavier Crispin, and Tae-il Kim ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b11362 • Publication Date (Web): 15 Oct 2018 Downloaded from http://pubs.acs.org on October 19, 2018
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ACS Applied Materials & Interfaces
Gelatin-Hydrogel based Organic Electrochemical Transistors and their Integrated Logic Circuits Young Jin Jo, † Kiyoon Kwon, † Zia Ullah Khan, ‡ Xavier Crispin ‡and Tae-il Kim *,†, ‡ †
School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
‡
Department of Biomedical Engineering, Sungkyunkwan University (SKKU), Suwon, 16419, Republic of Korea
§
Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, S-60174, Norrköping, Sweden
KEYWORDS: Gelatin hydrogel, PEDOT:PSS, pH modulation, Organic electrochemical transistor, Logic circuit ABSTRACT: We suggest gelatin hydrogel as electrolyte and demonstrate OECT based on a sheet of gelatin. We also modulate electrical characteristics of the OECT with respect to pH condition of gelatin hydrogel from acid to base, and analyze its characteristics based on electrochemical theory. Moreover, we extend the gelatin based OECT to electrochemical logic circuits, for example, NOT, NOR and NAND gate.
biocompatibility utilized in bioelectronics 32-38; however, the mechanism of operation is totally different from field-effect transistors, from the aspect of direct injection of ions into the active layer. Moreover, OECTs are utilized with silver (Ag)/silver chloride (AgCl) electrodes as gate/reference. Similarly, developing liquid electrolyte-based OECTs into various types of electronics is also limited, as mentioned above.
INTRODUCTION Organic field-effect transistors (OFETs) based on new organic semiconductors and fabrication methods, like 3D printing 1-5 or meniscus coating 610, are expected to allow novel opportunities to create flexible display 11-12, foldable electronics 13-15, and electronic skins (E-skin) 16-19, due to their flexibility, biocompatible nature, and costeffectiveness. Alternatively, electrolyte-gated transistor (EGT) 20-25 is also compatible and promising, due to its high capacitance electrolyte, which is much higher than conventional dielectric materials, such as silicon dioxide (SiO2) 26-28. Typically, EGTs are based on liquid electrolytes having free mobile ions, which are the main components to form higher capacitance induced by an electrical double layer at low driving voltage (
