Abstract Spin coating and successive ionic layer adsorption and reaction (SILAR) method were adopted to deposit commercial TiO2 (Degussa-P25), un-dopedCdS and Co2+-doped CdS quantum dots (QDs). Characteristic peak for CdS, TiO2and FTO were observed in powder X-ray diffraction pattern of the prepared samples. Co2+-doping was confirmed through energy dispersive X-ray spectroscopy and elemental mapping analysis. Spherical shaped morphology was observed in field emission scanning electron microscopy (FE-SEM). Measured size of CdS is ~8 nm and the TiO2 is ~20 nm through HR-TEM imaging. The maximum absorption range was observed as 570 nm for 3% Co2+-doped CdS QDs. Power conversion efficiency of un-doped CdS and 3% Co2+-doped CdS QDs were 0.54% and 1.21% respectively. It indicated that up to 3% Co2+-doping in CdS QDs leads to remarkable enhancement in the optical absorption, absorption range and photovoltaic performance under chosen experimental conditions.

中文翻译：

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在用于太阳能电池应用的 CdS 量子点中加入 Co2+

摘要 采用旋涂和连续离子层吸附反应（SILAR）方法沉积商业TiO2（Degussa-P25）、未掺杂的CdS和掺杂Co2+的CdS量子点（QD）。在制备的样品的粉末X射线衍射图中观察到CdS、TiO2和FTO的特征峰。通过能量色散 X 射线光谱和元素映射分析证实了 Co2+ 掺杂。在场发射扫描电子显微镜（FE-SEM）中观察到球形形态。通过 HR-TEM 成像测得的 CdS 尺寸为 ~8 nm，TiO2 为 ~20 nm。对于 3% Co2+ 掺杂的 CdS QD，观察到最大吸收范围为 570 nm。未掺杂的 CdS 和 3% Co2+ 掺杂的 CdS QD 的功率转换效率分别为 0.54% 和 1.21%。