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

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Improving the parameters of electron transport in quantum dot sensitized solar cells through seed layer deposition†
RSC Advances ( IF 3.9 ) Pub Date : 2018-07-19 00:00:00 , DOI: 10.1039/c8ra04413a
Mahmoud Samadpour ₁

Affiliation

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 TiO₂ 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.

中文翻译：

通过种子层沉积改善量子点敏化太阳能电池中的电子传输参数†

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) 电子传输参数的影响。通过减少种子层沉积后的复合，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效果，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%）系统地获得了明显更高的效率值，具体取决于TiO ₂光阳极粒径。通过对实验阻抗谱数据建模，检查了电池中的电子传输参数，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。我们发现种子层增强了细胞中的重组阻力，而光阳极导带位置不受影响。在种子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种子层沉积降低的电子复合率相关。作为一般结论，我们报告说，虽然种子层通常被沉积以增加光吸收，

更新日期：2018-07-19

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