Effect of spatial inhomogeneity of charge carrier mobility on current-voltage characteristics in organic field-effect transistors

Juliusz Sworakowski*, Urszula Bielecka, Petro Lutsyk, Krzysztof Janus

*Corresponding author for this work

Research output: Contribution to journalArticle


A semi-quantitative model is put forward elucidating the role of spatial inhomogeneity of charge carrier mobility in organic field-effect transistors. The model, based on electrostatic arguments, allows estimating the effective thickness of the conducting channel and its changes in function of source-drain and gate voltages. Local mobility gradients in the direction perpendicular to the insulator/semiconductor interface translate into voltage dependences of the average carrier mobility in the channel, resulting in positive or negative deviations of current-voltage characteristics from their expected shapes. The proposed effect supplements those described in the literature, i.e., density-dependent mobility of charge carriers, short-channel effects, and contribution of contact resistance.

Original languageEnglish
Pages (from-to)56-61
Number of pages6
JournalThin Solid Films
Issue numberPart 1
Early online date5 Oct 2014
Publication statusPublished - 28 Nov 2014



  • charge carrier mobility
  • current-voltage characteristics
  • organic field-effect transistor

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