| Abstract [eng] |
In this thesis fluorene-based organic hole transport materials were investigated. These materials are used for organic and inorganic solar cells applications. The main advantages of the materials are ability of cross-linking and up to five times cheaper synthesis, in comparison to widely used and commercially available materials, like Spiro-OMeTAD. Estimated hole mobilities of materials are similar or even higher than Spiro-OMeTAD with almost identical values of ionization potential. The new apparatus to estimate ionization potential of semiconductor materials and metals in a gas mixture at atmospheric pressure was demonstrated. The technique uses photoemission yield spectroscopy in air method. The apparatus is able to detect photoemission signals down to a single electron per second (10−19 A), which allows more accurate estimation of photoemission threshold. The new method of plotting photoemission yield spectra as (dY/d(hν))1/2 was proposed, which provides more precise estimation of ionization potential in comparison to Y1/n plot. The graphical presentation of this function is more informative and shows multiple thresholds in photoemission yield spectrum. The solar cell of superstrate configuration FTO/TiO2/Cu2ZnSnSe3.2S0.8/ Spiro-OMeTAD /Ag was demonstrated power conversion efficiency of 3.1%, which was the highest reported value for the spray pyrolysis deposited superstrate solar cells up to date. |
