Space-charge-limited current through the electrophoretically formed TiO2/HOPG junction

Autor: Faramarz Hossein-Babaei, Reza Razmand, Ali Nazari, Mehrdad Naemi Dehkharghani
Rok vydání: 2020
Předmět:
Zdroj: 2020 28th Iranian Conference on Electrical Engineering (ICEE).
Popis: Examining the electronic properties of the interface between a semiconductor and the “highly oriented pyrolytic graphite” (HOPG) is an easy, but close, substitute to the investigation of the similar interfaces formed with graphene. Thin layers of TiO 2 are deposited on the freshly cleaved surfaces of HOPG by the electrophoretic deposition (EPD). The process is carried out in the acetone suspensions of sub-100 nm anatase particles using no charging agent. The deposition is anodic. The conductive HOPG substrate is placed on an immersed metal anode. By applying an electric field of 80 V/cm, a layer of anatase is formed on the anode. The produced layers are dried at room temperature and thermally annealed at 350 °C, in air. The samples are examined for the mechanism of electrical conduction through the TiO 2 /HOPG junctions by applying varying voltages across the junction and monitoring the current. The obtained current vs voltage diagrams show zero junction barrier. The almost symmetric nonlinearity observed in the I-V diagrams are shown to occur owing to the prevailing space-charge-limited conduction mechanism.
Databáze: OpenAIRE