ELECTRODEPOSITION OF POLYANILINE ON FLEXIBLE PET/ITO SUBSTRATES AS A COUNTER ELECTRODE IN DYE-SENSITIZED SOLAR CELL

• Main Author: Ramadhanty, Novalina
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/79601
• Institution: Institut Teknologi Bandung

Dye-sensitized solar cells (DSSC) are included in the third-generation solar cell group with low cost, simple preparation, low toxicity, and easy production process. DSSC has several main components, namely photoanode, dye, electrolyte, and counter electrode. The counter electrode has an important role in DSSC because it can be used as a positive electrode that receives electrons from the external circuit, as well as a catalyst in the reduction process in the I-/I3- redox couple electrolyte. One of the common flexible conductive substrates used in counter electrodes is polyethylene terephthalate coated with indium-tin-oxide (PET/ITO). PET/ITO is difficult to reduce the redox-couple electrolyte, so catalytic materials such as conductive polymer polyaniline (PANI) are needed. The PANI film expected to be synthesized is PANI emeraldine salt (PANI-ES), which has the highest conductivity and a characteristic green color. PANI film synthesis was carried out electrochemically using 6 variations of aniline-HCl electrolyte solutions. The aniline concentration used was 0,5 M, and variations in HCl concentration, that is, 0.1, 0.3, 0.5, 0.6, 1.0, and 2.0 M. Electrodeposition was carried out with a current density of 0,01 A/cm2 for 60 s. PANI films deposited on PET/ITO provide different colors, thicknesses, and characterization results using UV-Vis Diffuse Transmittance (DTS), UV-Vis Diffuse Reflectance (DRS), ATR-FTIR, and Raman spectroscopy. Among electrodeposited PANI films at various HCl concentrations, the samples with the most like PANI-ES colors are PANI-1,0 and PANI-2,0. The results of UV-Vis DTS, UV-Vis DRS, ATR-FTIR, and Raman characterization show that PANI-1,0 and PANI-2,0 have PANI-ES characteristics. PANI-1,0 is then used as the counter electrode in the DSSC device, providing the highest efficiency value (1,642%) compared to PANI films with other HCl concentrations. PANI-1,0 deposition results provide the highest film thickness (5,71 ?m) and a more even film surface on the PET/ITO substrate. Therefore, the optimum conditions for the synthesis of PANI films that have the potential to be used as counter electrodes in DSSC devices are PANI- 1,0 with a solution of 0,5 M aniline in 1,0 M HCl at a current density of 0,01 A/cm2 for 60 s