CdS quantum dots pre-deposition for efficiency enhancement of quantum dot-sensitized solar cells
CdS quantum dots pre-deposition for efficiency enhancement of quantum dot-sensitized solar cells
复制标题
DOI：
10.1016/j.solener.2019.06.078
复制
发表时间：
2019-08
期刊：
影响因子：
6.7
通讯作者：
M. Samadpour;H. K. Jun;P. Parand;M. Najafi
中科院分区：
文献类型：
--
作者：
M. Samadpour;H. K. Jun;P. Parand;M. Najafi
在这里，我们报告了各种半导体敏化剂（即 CdS、CdSe、CdS/CdSe 和 PbS/CdS）对量子点敏化太阳能电池 (QDSC) 性能影响的一般研究。通过施加偏置电压衰减方法研究电池中的电子寿命。我们清楚地表明，在 CdS/CdSe QD 敏化电池中，通过 CdS 预沉积可以显着延长电子寿命。通过阻抗谱研究电池的电荷转移特性，结果表明，通过 CdS QDs 敏化剂预沉积，TiO2 导带发生明显的下移。结果表明，量子点沉积的类型和顺序对细胞内的复合阻力有明显的影响。通过 CdS 预沉积，太阳能电池的效率提高到 3.63%，与 CdSe 敏化电池 (2.84%) 相比提高了 25% 以上。这项一般性研究表明，可以在 QDSC 中系统地使用调整敏化剂类型，以简单且具有成本效益的方式延长电子寿命，从而提高电池的性能。
Here we report a general study on the effect of various semiconductor sensitizers i.e. CdS, CdSe, CdS/CdSe, and PbS/CdS on the performance of quantum dot sensitized solar cells (QDSCs). The electron life time in the cells is investigated by applied bias voltage decay method. We clearly indicate that the electron life time could be considerably enhanced by CdS pre-deposition in CdS/CdSe QD sensitized cells.The charge transfer properties of cells are investigated by impedance spectroscopy and it is shown that a clear downward shift in TiO2conduction band take place through CdS QDs sensitizer pre-deposition. According to the results, type and the sequence of QDs deposition has a clear effect on the recombination resistance in cells. Here the efficiency of solar cells was improved to 3.63% by CdS pre-deposition which is more than 25% improvement in comparison to CdSe sensitized cells (2.84%). This general study indicates that tuning the sensitizer type can be systematically used in QDSCs to increase the electron life time and consequently the cells’ performance in a simple and cost effective way.