Revealing the origin of electrical noise in PEDOT:PSS organic electrochemical transistors
발표자
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초록
내용
In organic electrochemical transistors (OECTs), ions penetrate to the bulk of the organic channel, leading to changes in the bulk doping state. Through bulk doping of the channel, the high transconductance values of OECTs have enabled their advantages in biosensors. However, the origin of electrical noise in OECTs has rarely been investigated. Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), has been researched intensively, as a channel material for the OECT. PEDOT:PSS is a mixed-ionic-electronic-conductor, where holes are transported between PEDOT chains while the PSS moiety accommodates solvated ion transport. With sulfuric acid treatment, improved conductivity and electronic transport are attributed to the formation of enlarged PEDOT-rich domain and shorter PEDOT stacking. Here, we carry out the noise analysis of PEDOT:PSS treated with varying concentrations of sulfuric acid in order to systematically investigate the origin of the electrical noise in OECTs.