Abstract
The hybrid solar cells were co-sensitized with CdS/Ag2S quantum dots (QDs) and N719 dye as sunlight harvester. The results of photoluminescence (PL) spectrum revealed that the introduction of QDs can inhibit electron-hole recombination and enhance the charge injection efficiency from sensitizer into TiO2 semiconductor. The introduction of QDs can effectively enlarge the responding extent and intensity of sunlight, so as to improve the power conversion efficiency (PCE) of the cells. PCE of CdS/Ag2S QDs and dye co-sensitized solar cell improve greatly, up to 7.25%, 42.7% higher than that of dye sensitized solar cells (5.08%), and also higher than that of CdS QD and dye co-sensitized solar cells (6.13%) obviously. The short circuit current density (Jsc) improves greatly, up to 16.53 mA/cm2. The mechanism of effect of QDs on the photovoltaic performance of QDs/dye co-sensitized solar cells was investigated combining photoanode microstructure characterization with electrochemical impedance (EIS) and current-voltage (J-V) curves analysis of cell samples.
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