Investigating Charge Transport in Organic Electrochemical Transistors via Electrical Noise Analysis
발표자
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초록
내용
The doping state of organic channels in organic electrochemical transistors (OECTs) changes due to the penetration of ions, resulting in a larger drain current than field-effect transistors (FETs) with similar dimensions. Despite offering several benefits for biosensing applications, the reason for electrical noise in OECTs remains unknown. The use of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) has recently been explored as a channel material for OECTs. PEDOT:PSS acts as a mixed-ionic-electronic-conductor, with PEDOT chains transporting holes and the PSS moiety facilitating solvated ion transport. By enlarging the PEDOT-rich domain and shortening PEDOT stacking through sulfuric acid treatment, the conductivity and electronic transport of PEDOT:PSS can be improved. This research demonstrates that the electrical noise observed in OECTs results from number fluctuations of charge carriers, which leads to possibility of extracting the carrier density dependence of mobility in PEDOT:PSS OECTs.