Abstract
Dye Sensitized Solar Cell (DSSC) using titanium dioxide (TiO2) has begun to play a significant role in future solar energy since it is known as cost effective and highly efficient. DSSC is the third generation of photovoltaic cells that have been widely investigated as a promising replacement of current commercial solar cell. However, the highest efficiency of DSSC still has not achieved the minimum requirement so that it can be commercialize. Much research has been done to improve DSSC performance by focusing on photoanodes layer. In this study, graphene was employed into TiO2 photoanode to increase the efficiency and to enhance the performance of dye sensitized solar cell. Four different samples of nanocomposites paste were prepared by varying the graphene composition of 0.00, 0.30, 0.50 and 0.70 wt%. The prepared samples were coated on Fluorine-Doped Tin Oxide (FTO) conductive glass substrates by a doctor blade method and annealed at 450oC for 30 minutes. The morphology and structure of the graphene-TiO2 nanocomposites layer were characterized by using Field Emission Scanning Electron Microscope (FESEM). The optical properties were studied by using UV-visible spectroscopy. Based on the result show that addition of graphene into TiO2 have provide larger surface area compared to pure TiO2. The optical properties of Graphene-TiO2 nanocomposites also improved as the fundamental of absorption edge has shifted toward longer wavelength and reduce the optical band gap.
Highlights
Wastewater In this era of modern technology, energy has become one of the main parts of our life
Different sample compositions of Graphene-TiO2 from 0.30, 0.50 and 0.70 wt% were prepared to investigate the effect of graphene toward Dye Sensitized Solar Cell (DSSC) performance
The surface morphologies of the original TiO2 and Graphene-TiO2 nanocomposites anodes were investigated by Field Emission Scanning Electron Microscope (FESEM) analysis
Summary
Wastewater In this era of modern technology, energy has become one of the main parts of our life. The earth’s surface receives approximately 3x1024 joule/year of solar radiation, which is 10 times higher than energy demand of the entire world This light intensity from the sun could be harvested by DSSC since this third generation of photovoltaic cell is known to be cost effective and highly efficient [2,7]. Graphene is known as carbonaceous material with a single layer that provides a faster electron transfer path, reduces the electron-hole recombination rate in TiO2layer and produce large surface area [14,16] These unique characteristics of graphene make it usable as additive in TiO2photoanodes to enhance electron mobility and further improve DSSC performance. With lower band it is expected can enhance the DSSC performance and efficiency
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