Abstract
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).
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