FABRICATION AND CHARACTERIZATION OF REDUCED GRAPHENE OXIDE BASED ON DSSC

• Main Author: ASYRAF ARIFFIFUDDIN, DAUD
• Format: Final Year Project Report
• Language: English; English
• Published: Universiti Malaysia Sarawak, (UNIMAS) 2019
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://ir.unimas.my/id/eprint/34432/3/Asyraf%20Ariffifuddin%20Bin%20Daud.pdf; http://ir.unimas.my/id/eprint/34432/6/Asyraf%20Ariffifuddin%20Bin%20Daud%20ft.pdf; http://ir.unimas.my/id/eprint/34432/

In this study, dye-sensitized solar cells were fabricated using rGO as a semiconducting layer dyed with different natural extracts. Reduced graphene oxide (rGO) solution with different molarities were synthesized by chemical reduction with hydrazine hydrate as a reducing agent. The rGO solution is deposited on glass substrates by using drop casting method. The morphological, optical and electrical properties of rGO thin film were carried out using scanning electron microscopy (SEM), Ultraviolet-Visible spectroscopy (UV-Vis), and current-voltage (I-V) characteristic. The effects of different molarity of rGO solution is studied. The performance of the rGO thin film with different organic dyes were tested for the electrical properties at three different condition which are normal, light and dark condition. The morphological study of rGO shows that the 0.010M of rGO solution is the optimum molarity and has a higher absorbance compare to 0.005M and 0.015M. By analysing different organic dyes with rGO thin films such as turmeric (curcumin), spinach (chlorophyll) and beetroot (anthocyanin), it was noted that the chlorophyll pigments from spinach dye has several absorption peaks in the range of wavelength shows by UV-Vis result. Based on I-V curve results, chlorophyll shows the highest current value flows in the DSSC device which is 9.82 mA compared to anthocyanin (8.94 mA) and curcumin dye (6.93 mA). Chlorophyll pigment shows a good electrical conductivity for the DSSC device which is 0.0300 S/m compare to anthocyanin (0.0250 S/m) and curcumin dye (0.0178 S/m). The different type of organic dye affects the performance of DSSC as the efficiency of chlorophyll is 0.235%, anthocyanin (0.193%) and curcumin (0.133%).