Electrolyte-gated organic field-effect transistors (EGOFETs), based on ultrathin pentacene films on quartz, were operated with electrolyte solutions whose pH was systematically changed. Transistor parameters exhibit nonmonotonic variation versus pH, which cannot be accounted for by capacitive coupling through the Debye-Helmholtz layer. The data were fitted with an analytical model of the accumulated charge in the EGOFET, where Langmuir adsorption was introduced to describe the pH-dependent charge buildup at the quartz surface. The model provides an excellent fit to the threshold voltage and transfer characteristics as a function of the pH, which demonstrates that quartz acts as a second gate controlled by pH and is mostly effective from neutral to alkaline pH. The effective capacitance of the device is always greater than the capacitance of the electrolyte, thus highlighting the role of the substrate as an important active element for amplification of the transistor response.

The substrate is a pH-controlled second gate of electrolyte-gated organic field-effect transistor / Di Lauro, Michele; Casalini, Stefano; Berto, Marcello; Campana, Alessandra; Cramer, Tobias; Murgia, Mauro; Geoghegan, Mark Anthony; Bortolotti, Carlo Augusto; Biscarini, Fabio. - In: ACS APPLIED MATERIALS & INTERFACES. - ISSN 1944-8244. - 8:46(2016), pp. 31783-31790. [10.1021/acsami.6b06952]

The substrate is a pH-controlled second gate of electrolyte-gated organic field-effect transistor

DI LAURO, MICHELE;CASALINI, Stefano;berto, marcello;Murgia, Mauro;GEOGHEGAN, MARK ANTHONY;BORTOLOTTI, Carlo Augusto;BISCARINI, FABIO
2016

Abstract

Electrolyte-gated organic field-effect transistors (EGOFETs), based on ultrathin pentacene films on quartz, were operated with electrolyte solutions whose pH was systematically changed. Transistor parameters exhibit nonmonotonic variation versus pH, which cannot be accounted for by capacitive coupling through the Debye-Helmholtz layer. The data were fitted with an analytical model of the accumulated charge in the EGOFET, where Langmuir adsorption was introduced to describe the pH-dependent charge buildup at the quartz surface. The model provides an excellent fit to the threshold voltage and transfer characteristics as a function of the pH, which demonstrates that quartz acts as a second gate controlled by pH and is mostly effective from neutral to alkaline pH. The effective capacitance of the device is always greater than the capacitance of the electrolyte, thus highlighting the role of the substrate as an important active element for amplification of the transistor response.
2016
11-nov-2016
8
46
31783
31790
The substrate is a pH-controlled second gate of electrolyte-gated organic field-effect transistor / Di Lauro, Michele; Casalini, Stefano; Berto, Marcello; Campana, Alessandra; Cramer, Tobias; Murgia, Mauro; Geoghegan, Mark Anthony; Bortolotti, Carlo Augusto; Biscarini, Fabio. - In: ACS APPLIED MATERIALS & INTERFACES. - ISSN 1944-8244. - 8:46(2016), pp. 31783-31790. [10.1021/acsami.6b06952]
Di Lauro, Michele; Casalini, Stefano; Berto, Marcello; Campana, Alessandra; Cramer, Tobias; Murgia, Mauro; Geoghegan, Mark Anthony; Bortolotti, Carlo Augusto; Biscarini, Fabio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1136498
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