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Improving the parameters of electron transport in quantum dot sensitized solar cells through seed layer deposition

机译：通过种子层沉积改善量子点敏化太阳能电池中电子传输的参数

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Here we investigate the effect of seed layer deposition on electron-transport parameters of chemical-bath-deposited (CBD) CdSe quantum dot sensitized solar cells (QDSCs). Fill factors were systematically improved to more than 0.6 through reduced recombination after seed layer deposition. Considering the beneficial effects of seed layer deposition, noticeably higher efficiency values were systematically obtained in cells with the seed layer (2–3.19%) in comparison to cells without a seed layer (0.03–0.46%) depending on the TiO _(2) photoanode particle size. Electron-transport parameters in cells, including chemical capacitance, recombination resistance, the diffusion coefficient, electron life time and small perturbation diffusion lengths of electrons were examined by modeling the experimental impedance spectroscopy data. We showed that a seed layer enhanced recombination resistance in cells, while the photoanode conduction band position was not affected. Higher diffusion lengths of electrons were obtained after seed layer deposition, correlated to the reduced electron recombination rate by redox electrolyte through seed layer deposition. As a general conclusion we report that while the seed layer generally is deposited to increase light absorption, at the same time this could be applied in order to systematically enhance charge-transport properties in cells and it has a clear application in the optimization of QDSC performance.
机译：在这里，我们研究了种子层沉积对化学浴沉积（CBD）CdSe量子点敏化太阳能电池（QDSC）的电子传输参数的影响。通过减少种子层沉积后的重组，将填充因子系统地提高到0.6以上。考虑到种子层沉积的有益作用，与没有种子层的电池（0.03-0.46％）相比，具有种子层的电池（2-3.19％）可以系统地获得更高的效率值，具体取决于TiO _（2）光电阳极粒径。通过对实验阻抗谱数据进行建模，检查了细胞中的电子传输参数，包括化学电容，复合电阻，扩散系数，电子寿命和电子的小扰动扩散长度。我们表明，种子层增强了细胞中的重组抗性，而光阳极导带的位置不受影响。晶种层沉积后，获得了更高的电子扩散长度，这与氧化还原电解质通过晶种层沉积所降低的电子复合速率有关。作为一般结论，我们报告，尽管通常沉积种子层以增加光吸收，但同时可以应用该层以系统地增强细胞中的电荷传输性质，并且在优化QDSC性能方面有明确的应用。

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