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Title: Influence of Water on the Performance of Organic Electrochemical Transistors
Authors: Savva, Achilleas 
Cendra, Camila 
Giugni, Andrea 
Torre, Bruno 
Surgailis, Jokubas 
Ohayon, David 
Giovannitti, Alexander 
McCulloch, Iain 
Di Fabrizio, Enzo 
Salleo, Alberto 
Rivnay, Jonathan 
Inal, Sahika 
Keywords: Transistors;Thin film transistors;Electrochemical transistor
Category: Mechanical Engineering
Field: Engineering and Technology
Issue Date: 12-Feb-2019
Source: Chemistry of Materials, 2019, vol. 31, nο. 3, pp. 927-937
Journal: Chemistry of Materials 
Abstract: © Copyright 2019 American Chemical Society. Organic electrochemical transistors (OECTs) composed of organic mixed conductors can operate in aqueous, biological media and translate low-magnitude ionic fluctuations of biological origin into measurable electrical signals. The growing technological interest in these biotransducers makes the fundamental understanding of ion-to-electron coupling extremely important for the design of new materials and devices. One crucial aspect in this process that has been so far disregarded is the water taken up by the film during device operation and its effects on device performance. Here, using a series of the same electrolyte with varying ion concentrations, we quantify the amount of water that is incorporated into a hydrophilic p-type organic semiconductor film alongside the dopant anions and investigate structural and morphological changes occurring in the film upon electrochemical doping. We show that infiltration of the hydrated dopant ions into the film irreversibly changes the polymer structure and negatively impacts the efficiency, reversibility, and speed of charge generation. When less water is injected into the channel, OECTs exhibit higher transconductance and faster switching speeds. Although swelling is commonly suggested to be a necessity for efficient ion-to-electron transduction, this work uncovers the negative impact of a swollen channel material on the performance of accumulation mode OECTs and lays the foundation for future materials design.
ISSN: 0897-4756
DOI: 10.1021/acs.chemmater.8b04335
Collaboration : King Abdullah University of Science and Technology
Stanford University
Imperial College London
Northwestern University
Cyprus University of Technology
Rights: © American Chemical Society
Type: Article
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