TiO2 THICKNESS AND GRAPHENE QUANTUM DOTS VARIATION IN PHOTOANODE OF DYE SENSITIZED SOLAR CELL USING RESPONSE SURFACE METHODOLOGY (RSM) TECHNIQUE

Abstract

In this study, the range of TiO₂ thickness and GQDs amount were varied to determine the efficiency response of DSSC by response surface methodology (RSM). The best efficiency of 5.65% obtained when the thickness was optimized at 5 μm and 50 μL GQD amount was spin coated on top of TiO₂ photoanode. This efficiency may be due to GQD absorbed efficiently on TiO₂ surface at 5 μm thicknesses and the photoluminescence behavior by GQD employed in this work. Hence, improved light harvesting in the visible region and generated higher photo current density. A good model for comparing the actual and predicting values of power conversion efficiency of DSSC by varying the TiO₂ thickness and addition of GQD amount were obtained through this work.