Abstract
Two indoline dyes, coded D149 and D205, were used as the sensitizers ofZnO dye-sensitized solar cells (DSCs) with optimal energy conversionefficiencies of more than 5%, under AM 1.5 full sunlight illumination (100 mW cm − 2). Higher interfacial charge transfer rate and retardant fluorescence decay confirmed fromtransient fluorescence illustrated that D205-sensitized ZnO DSCs could possessbetter electron transport than D149-sensitized ZnO DSCs. The enhancement ofVoc andJsc for D205-sensitized ZnO DSCs was ascribed to the effective suppression of electronrecombination by extending the alkyl chain on the terminal rhodanine moiety from ethyl tooctyl. The evidence of enhanced electron diffusion coefficient was further shown byelectrochemical impedance spectroscopy (EIS).
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