Abstract
In-liquid biosensing is the new frontier of cells real time monitoring and biomarkers detection. In order to improve the stability and electrical properties of an Electrolyte Gated Organic Field Effect Transistor (EGOFET) biosensor, in this study we investigate the effect of the solvent and of the substrate modification on thin films of organic semiconductor Poly(3-hexylthiophene) (P3HT). The studied surface is the relevant interface between the P3HT and the electrolyte acting as gate dielectric for in-liquid detection of an analyte. AFM and XPS characterizations were employed to study the effect of two solvents (toluene and 1,2-dichlorobenzene) and of the adhesion promoter (Ti prime) on the morphological structure and electronic properties of P3HT film. Combining the results from the surface characterizations with electrical measurements, we investigate the changes on the EGOFET performances and stability in DI water with an Ag/AgCl gate electrode.
Highlights
Electrolyte Gated Organic Field Effect Transistors (EGOFETs) are emerging as a promising technology for biosensing applications due to their high sensibility, low-voltage operation, biocompatibility and low-cost fabrication [1].Poly(3-hexylthiophene) (P3HT) is one of the most used materials for this kind of devices due to its relatively high carrier mobility and easy processability [2]
Recent works have exploited P3HT as organic semiconductor for EGOFET biosensors [3], but the main drawback still affecting these devices is their fast degradation when working in ambient conditions [4], with respect to similar devices as Organic Electro Chemical Transistors (OECTs), which exhibit a better stability in-liquid
In this study we investigate the effect of solvents and adhesion promoter on the morphology and electronic structure of a P3HT film surface
Summary
Electrolyte Gated Organic Field Effect Transistors (EGOFETs) are emerging as a promising technology for biosensing applications due to their high sensibility, low-voltage operation, biocompatibility and low-cost fabrication [1].Poly(3-hexylthiophene) (P3HT) is one of the most used materials for this kind of devices due to its relatively high carrier mobility and easy processability [2]. Recent works have exploited P3HT as organic semiconductor for EGOFET biosensors [3], but the main drawback still affecting these devices is their fast degradation when working in ambient conditions [4], with respect to similar devices as Organic Electro Chemical Transistors (OECTs), which exhibit a better stability in-liquid [5] and a tailorable conductive behavior [6]. In this study we investigate the effect of solvents and adhesion promoter on the morphology and electronic structure of a P3HT film surface. Being this surface the interface between the organic semiconductor and the liquid dielectric in an EGOFET, by optimizing the surface properties we can optimize device performances and stability.
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