Browsing by Author "Ehgartner, Henri"

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  • Kallon läpi suoritettavan tasavirtastimulaation sovellukset
    (2018-05-11) Ehgartner, Henri
     Sähkötekniikan korkeakoulu | Bachelor's thesis
  • Surface microscopy techniques for organic devices - A study of surface potentials
    (2024-08-19) Ehgartner, Henri
     Sähkötekniikan korkeakoulu | Master's thesis
    When designing high-performance organic electronic devices, numerous parameters need to be considered and optimized. One such parameter is the surface potential and work function of a material, which can be measured using Kelvin probe force microscopy (KPFM). This thesis uses amplitude modulated KPFM to study the surface potentials of an organic field-effect transistor (OFET) that uses C8BTBT as the organic semiconductor material for the channel. In this thesis I find an average potential difference between the electrode (Ag) and the channel (C8BTBT) to be 667 mV. However, the surface potential difference varies throughout the potential image. This varying potential has a gradual trend and abrupt changes, which is speculated to be a result of the semi-automated atomic force microscopy (AFM) imaging that is used in amplitude modulated KPFM.