Irshad, I. S.2024-11-142024-11-142015https://ir.lib.pdn.ac.lk/handle/20.500.14444/3403Solar cells are becoming most promising alternative energy source in recent years due to its cleanness, abundant, low-cost and easy fabrication. In this study, Ti0₂ working electrode was prepared by using doctor blade method. The dye on the photoanode as a sensitizer with the iodide/triiodide-based liquid electrolyte gave maximum efficiency of 5.77%. In contrast, dye-PbS quantum dots (QDs) sensitized on Ti0₂ gave an efficiency of 2.54% and 2.01% in drop cast method and successive ionic layer adsorption and reaction (SILAR) method respectively . QDs were fabricated on Ti0₂ photoanode its efficiency was very low. This might be due to the corrosive effects of iodide ions towards the PbS QDs. In order to overcome this problem, polysulfide-based quasi-solid-state gel polymer electrolyte was introduced to the quantum dot-sensitized solar cell (QDSCs)-based system. The device consisting of the polysulfide-based gel electrolyte showed the conductivity of 1.178x10⁻⁴ Scm⁻¹, the maximum efficiency of the Dye-QD coupled sensitized solar cell with drop cast method was 0.04% and SILAR.methods was 0.01%. PbS QDs fabricated on the Ti0₂ photoanode gave 0.03% of efficiency using drop cast method and 0.01% of efficiency using SILAR method . The IV characteristic measurements were obtained under the AM 1.5 Irradiation at 25°C by using solar simulator. When Ti0₂ was sensitized with quantum dots overall performance of the cell degrades but still the results are confirms that drop cast method gives better solar cell performances than conversional SILAR method.en-USSolar cellsTitanium dioxideThesis