Yenel Esma
Department of Electricity and Energy, Konya Technical University, School of Technical Science, Konya Turkey.
Turk J Chem. 2021 Sep 16;45(6):1952-1958. doi: 10.3906/kim-2107-2. eCollection 2021.
In this study, colloidal CdS quantum dots were synthesized, structurally characterized, and their effect on performance of perovskite solar cells was observed by using them as interface modification agent between TiO/perovskite. Colloidal CdS quantum dots were synthesized based on two-phase method and characterized by X-ray diffraction and Transmission Electron Microscopy techniques. The average particle size of CdS quantum dots have found to be around 5 nm. Oleic acid was used as capping agent during synthesis to lead solubility in organic solvents. Obtained quantum dots are coated on compact TiO layer for surface modification. A decrease was observed when oleic acid capped CdS quantum dots were used at interface, while significant improvement was observed when ligand exchange was carried out by pyridine before perovskite layer. Reference solar cells showed 11.6% efficiency, while pyridine capped CdS modified solar cells' efficiency was 13.2%. Besides the improvement in efficiency, reproducibility of solar cells also was increased by using pyridine capped CdS as interface material.
在本研究中，合成了胶体硫化镉量子点并对其进行了结构表征，通过将其用作二氧化钛/钙钛矿之间的界面改性剂，观察了它们对钙钛矿太阳能电池性能的影响。基于两相法合成了胶体硫化镉量子点，并通过X射线衍射和透射电子显微镜技术对其进行了表征。发现硫化镉量子点的平均粒径约为5纳米。在合成过程中使用油酸作为封端剂，以使其在有机溶剂中具有溶解性。将获得的量子点涂覆在致密的二氧化钛层上进行表面改性。当在界面处使用油酸封端的硫化镉量子点时，观察到效率降低，而在钙钛矿层之前用吡啶进行配体交换时，则观察到显著改善。参比太阳能电池的效率为11.6%，而吡啶封端的硫化镉改性太阳能电池的效率为13.2%。除了效率提高外，使用吡啶封端的硫化镉作为界面材料还提高了太阳能电池的可重复性。
