On the methodology of the determination of charge concentration dependent mobility from organic field-effect transistor characteristics

0485523 - ÚMCH 2019 RIV GB eng J - Journal Article
Menšík, Miroslav - Toman, Petr - Bielecka, U. - Bartkowiak, W. - Pfleger, Jiří - Paruzel, Bartosz
On the methodology of the determination of charge concentration dependent mobility from organic field-effect transistor characteristics.
Physical Chemistry Chemical Physics. Roč. 20, č. 4 (2018), s. 2308-2319. ISSN 1463-9076. E-ISSN 1463-9084
R&D Projects: GA ČR(CZ) GA15-05095S; GA MŠMT(CZ) LTC17029
EU Projects: European Commission(XE) MPNS COST Action MP1406
Institutional support: RVO:61389013
Keywords : field effect transistor * charge carrier mobility * conjugated polymer
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.567, year: 2018

We developed a new methodology for determining charge concentration dependent mobility from organic field-effect transistor (OFET) characteristics, applicable for semiconducting polymers with structural and energy disorder. We show that basic formulae recommended by the “IEEE Standard for Test Methods for the Characterization of Organic Transistors and Materials” for the determination of the field-effect mobility as obtained from the slope ISD1/2vs. VSG (in the saturation regime) or from the transconductance dISD/dVSG (in the linear regime) are not suitable for materials with concentration dependent charge carrier mobility. We propose alternative expressions, which can be directly analytically derived from the drift–diffusion equation with the mobility explicitly dependent on the charge concentration. This methodology for mobility determination was used for analysis of the experimental data obtained for a poly(3-hexylthiophene)-based OFET with the bottom gate–bottom SD electrode configuration.
Permanent Link: http://hdl.handle.net/11104/0281509