Microscopic Determination of Carrier Density and Mobility in Working Organic Electrochemical Transistors. Issue 42 (25th August 2019)

• Record Type: Journal Article
• Authors: Mariani, Federica; Conzuelo, Felipe; Cramer, Tobias; Gualandi, Isacco; Possanzini, Luca; Tessarolo, Marta; Fraboni, Beatrice; Schuhmann, Wolfgang; Scavetta, Erika
• Is Part Of: Small. Volume 15:Issue 42(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-25
• Subjects: carrier density -- organic electrochemical transistors -- organic semiconductors -- PEDOT:PSS -- scanning electrochemical microscopy; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201902534
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: A comprehensive understanding of electrochemical and physical phenomena originating the response of electrolyte‐gated transistors is crucial for improved handling and design of these devices. However, the lack of suitable tools for direct investigation of microscale effects has hindered the possibility to bridge the gap between experiments and theoretical models. In this contribution, a scanning probe setup is used to explore the operation mechanisms of organic electrochemical transistors by probing the local electrochemical potential of the organic film composing the device channel. Moreover, an interpretative model is developed in order to highlight the meaning of electrochemical doping and to show how the experimental data can give direct access to fundamental device parameters, such as local charge carrier concentration and mobility. This approach is versatile and provides insight into the organic semiconductor/electrolyte interface and useful information for materials characterization, device scaling, and sensing optimization. Abstract : The operation mechanisms of organic electrochemical transistors are explored by in operando probing of the local electrochemical potential of the organic semiconductor. Experimental data give direct access to fundamental device parameters, such as local charge carrier concentration and mobility, and unprecedented insight into the organic semiconductor/electrolyte interface.