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.

中文翻译：

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MWCNT含量和光阳极厚度对QDSCs微裂纹的影响

摘要 将多壁碳纳米管 (MWCNTs) 引入量子点敏化太阳能电池 (QDSCs) 的二氧化钛 (TiO2) 光阳极薄膜中，以改变烧结过程中产生的微裂纹结构。研究了不同质量分数（0%、0.01%、0.05%、0.1%和0.3%）的MWCNTs和光阳极膜厚度对QDSCs性能的影响。BET 测试证实酸处理后的 MWCNTs 具有更高的比表面积。上述光阳极用 CdS/ZnS 量子点 (QD) 敏化，然后用多硫化物电解质和 CuS 对电极组装到 QDSC 样品中。结果表明，具有 0.05 wt% MWCNTs 光阳极且厚度为 11.60 μm 的电池表现出最佳光电性能，其功率转换效率（PCE）提高了 73。3% 与裸 TiO2 光阳极 QDSC 相比。结合敏化光阳极微观结构表征、电化学阻抗（EIS）和电流-电压（JV）曲线的结果，定量研究了MWCNT质量分数和光阳极膜厚度对不同QDSCs光伏性能的协同效应。