Abstract
Multi-walled carbon nanotubes (MWCNTs) were introduced into titanium dioxide (TiO2) photoanode films in quantum dot sensitized solar cells (QDSCs) to modify the microcracks structure that produced during the sintering process. The effect of different mass fractions (0%, 0.01%, 0.05%, 0.1% and 0.3%) of MWCNTs and photoanode film thickness on the performance of QDSCs was investigated. BET test verified that MWCNTs after acid treatment possess a higher specific surface area. Above-mentioned photoanodes were sensitized with CdS/ZnS quantum dots (QDs) and then assembled to the QDSC sample with polysulfide electrolytes and CuS counter electrodes. The results showed that the cell with 0.05 wt% MWCNTs photoanode in 11.60 μm thickness exhibited the optimum photoelectric performance and its power conversion efficiency (PCE) increased by 73.3% compared with bare TiO2 photoanode QDSCs. The results of sensitized photoanodes microstructure characterization, electrochemical impedance (EIS) and current–voltage (J-V) curves were combined to investigate the synergetic effect of MWCNT mass fraction and photoanode film thickness on the photovoltaic performance of different QDSCs quantitatively.
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