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High‐Transconductance Organic Electrochemical Transistor Fabricated on Ultrathin Films Using Spray Coating
Author(s) -
Nishinaka Masaya,
Jinno Hiroaki,
Jimbo Yasutoshi,
Lee Sunghoon,
Wang Jiabin,
Lee Wonryung,
Yokota Tomoyuki,
Someya Takao
Publication year - 2021
Publication title -
small structures
Language(s) - English
Resource type - Journals
ISSN - 2688-4062
DOI - 10.1002/sstr.202000088
Subject(s) - transconductance , pedot:pss , materials science , polystyrene sulfonate , optoelectronics , coating , transistor , layer (electronics) , nanotechnology , voltage , electrical engineering , engineering
Organic electrochemical transistors (OECTs) are widely used for monitoring electrophysiological activities by exploiting advantages, such as flexibility, biocompatibility, low‐voltage operation, and high transconductance. Transconductance is a major factor that determines the sensitivity of OECT‐based sensors. In comparison with other field‐effect transistors, the transconductance of OECTs having the poly(3,4‐ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) channel layer is proportional to the channel thickness because the entire film acts as a channel. Therefore, the formation of a thick channel layer is essential for OECTs. However, it is difficult to form a thick film by spin coating. Herein, spray coating is introduced, and a thick and uniform PEDOT:PSS layer (1.05 μm) is successfully formed by controlling the compressed air pressure and number of coating cycles. Moreover, a high‐transconductance (7.5 mS) ultraflexible OECT with a sufficiently rapid response is fabricated (2.3 kHz).