Charge Carrier Transport Characterization of Photocatalytic TiO2-Y2O3 Nanorod Composite Arrays

  • 羅 之磊

Student thesis: Master's Thesis


The electrical properties of a photocatalytic TiO2-Y2O3 nanocolumn nanocomposite was investigated in this research This is to generate new insights about the novel concept of TiO2 being coupled with a high-κ material as it has been shown that the combination results in a synergistic improvement in photocatalytic efficiency As such a 5x TiO2-Y2O3 nanocolumn nanocomposite sample library as well as pure-component TiO2 and Y2O3 samples were fabricated on FTO/glass substrate via DC metal sputtering and ex-situ annealing process The fabricated samples were then turned into test devices by the addition of a aluminum metal top contact using photolithography These samples were then subjected to current-voltage (IV) and capacitance-voltage (CV) testing The parameters desired to be extracted using IV is the exhibited Schottky barrier heights of the devices and their series resistances The pure component samples exhibited back-to-back Schottky curves but with TiO2 exhibiting higher turn-on currents than Y2O3 The 5x combinatorial sample deviated from the expected Schottky curves by exhibiting tunneling diode behavior in the TiO2-rich site which is around the composition of interest in this research Difficulties in CV testing were noted due to the highly defective nature of the samples fabricated but donor concentration was still extracted from the data Combining the IV and CV data the carrier mobility values of the thin films were successfully extracted with the TiO2-rich 5x combinatorial sample exhibiting the higher mobility than that of pure TiO2
Date of Award2016 Sep 2
Original languageEnglish
SupervisorKao-Shuo Chang (Supervisor)

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