Browsing by Author "Kumara K P"

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    A Photoelectrochemical Investigation of n- and p-type semi�conducting behaviour of Copper Oxide Films
    (Semiconductor Science and Technology, 1989) Siripala W; Kumara K P
    Copper(I) oxide films were prepared on copper substrates by exposing them to solutions containing Cu2+ ions, and it was observed that the photoresponse of these films electrodes in a photoelectrochemical cell is both n- and p-type. However, it was observed that the n-type behaviour of these film electrodes could be enhanced and the p-type behaviour could be reduced by adjusting the pH of the solution in which the oxide films had been prepared. The simultaneous existence of spatially separated n- and p-type regions in the Cu2O film is suggested as the possible reason for these observations. The anodic oxidation of copper was considered to be the origin of the p-type regions while the n-type regions were considered to be the result of the cathodic deposition of Cu2O.
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    Photovolatic properties of Cu2O/CuxS heterojunction
    (Journal of the National Science Council, Sri Lanka, 1990) Siripala W; Kumara K P
    A simple electrochemical method was developed to fabricate a Cu2O/CuxS heterojunction and it was then used in preparing a thin film photovoltaic soar cell. Cu2O was prepared by the method of electrodeposition and CuxS was coated on Cu2O by a simple dipping method. The photovoltaic properties of the cell could be improved significantly by heat treatment in air. The maximum conversion efficiency of the cell was 0.1% and V oc = 180mV and I sc = 2.0mA/cm2 under A M 1 artificial illumination.