Abstract
ABSTRACTUp-conversion (UC) enhanced quantum dots sensitized solar cells (QDSCs) were constructed using NaYF4/CdS/TiO2 thin films as photo-anode, Cu1.8S/CuS as counter electrode and polysulfide solution as liquid electrolyte. NaYF4 microrods were synthesized by solvothermal method and deposited onto fluorine-doped tin oxide (FTO) glass by dip-coating method. The influence of NaYF4 microrods concentration on photovoltaic performance was studied and the best power conversion efficiency of 1.07% was obtained by depositing NaYF4 solution for 4 cycles. The power conversion efficiency of QDSCs was much better enhanced compared with that of pure TiO2 thin films photoelectrode device. The morphology, phase structure and UC spectrum were characterized by XRD, SEM, TEM and Fluorescence spectrophotometer with a 980 nm laser excitation. The current-voltage (I–V) curves of QDSCs were tested with irradiation of solar simulator and recorded by photovoltaic testing system.
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