Solid state photoelectrochemical cells utilising graphite thin films counter electrode

• Main Authors: Rahman M.Y.A., Salleh M.M., Talib I.A., Yahaya M.
• Other Authors: 55347217400
• Format: Article
• Published: 2023
• Institution: Universiti Tenaga Nasional

This paper reports the use of graphite thin films as a counter electrode of a solid state photoelectrochemical cells of ITO/TiO2/PVC-LiClO 4graphite. The photoelectrochemical cells material was a screen-printed layer of titanium dioxide onto an ITO-covered glass substrate which was used as a working electrode of the device. The solid electrolyte used was PVC-LiClO4 that was prepared by solution casting technique. The graphite films which serve as a counter electrode were prepared onto glass substrate by electron beam evaporation technique at substrate temperatures variation of 25, 50, 100, 150 and 200�C. The dependence of sheet resistance and surface morphology of the graphite films on substrate temperature were studied. The films deposited at 25�C shows the smoothest surface morphology and the smallest grain size. Bigger grain size, rougher surface morphology of graphite film counter electrode. The current-voltage characteristics of four devices utilising the graphite counter electrode with different substrate temperature in dark as well as under illumination of 100 mWcm-2light from a tungsten halogen lamp were recorded at room temperature and at 50�C, respectively. It was found that the photovoltaic parameters of the device such as short-circuit current density, Jsc and open-circuit voltage, Voc increases with the decreasing average grain size of the graphite counter electrode. The device whose graphite film counter electrode was deposited onto the glass substrate at 25�C gave the highest Jsc of 0.32 ?A/cm2 and Voc of 117 mV, respectively.