Characterization and Photovoltaic Studies of Capped ZnS, CdS, and Cd1-xZnxS (x=0.25) Nanoparticles

Abstract

Capped ZnS, Cd1-xZnxS (x=0.25), and CdS nanoparticles (NPs) were prepared by co-precipitation method using mercaptoethanol as capping agent. X-ray diffraction (XRD), photoluminescence (PL), and optical absorption measurements were performed to characterize their structural and optical properties. The lattice constants and average particle size of cubic phase of capped ZnS, Cd1-xZnxS, and CdS NPs calculated from the XRD measurement. The quantum confinement effect on the NPs has been observed in the optical analysis. In addition, it is seen that the luminescence band of Cd1-xZnxS NPs enhances with the presence of Zn content. The incident photon to electron conversion efficiency (IPCE) and current density (J) - voltage (V) measurements exhibited that Capped Cd1-xZnxS (x=0.25) NPs coated on the TiO2 NWs has better performance compare to capped ZnS and CdS NPs on the TiO2 NWs. Capped Cd1-xZnxS (x=0.25) NPs can be promising material to improve the solar cell performance. 

Keywords

• Co-precipitation Method
• Capped ZnS
• Cd1-xZnxS and CdS Nanoparticles
• Structural and Optical Properties
• Solar Cells

References

1. 1- Akturk A., Tas H., Koksal K., Sahin M. 2016. The electronic and optical properties of a triexciton in CdSe/ZnS core/shell quantum dot nanocrystals. Philosophical Magazine 96 (6): 584-595
2. 2- Koc F., Koksal K., Sahin M. 2017. Effect of a buffer layer between the shell and ligand on the optical properties of an exciton and biexciton in type-II quantum dot nanocrystals. Philosophical Magazine 97 (3): 201-211
3. 3- Horoz S., Lu L., Dai Q., Chen J., Yakami B., Pikal J. M., Wang W., Tang. 2012. CdSe quantum dots synthesized by laser ablation in water and their photovoltaic applications. Applied Physics Letters 101: 223902
4. 4- Tilley R. D. 2008. Synthesis and Applications of Nanoparticles and Quantum Dots. Chemistry in New Zealand
5. 5- Xu X., Hu L., Gao H., liu S., Wageh S., Al-Ghamdi A.A., Alshahrie A., Fang X. 2015. Controlled Growth from ZnS Nanoparticles to ZnS–CdS Nanoparticle Hybrids with Enhanced Photoactivity. Advanced Functional Materials. 25 (3): 445-454
6. 6- Goodwin J.W., Hearn J., Ho C.C., Ottewill R.H. 1974. Studies on the preparation and characterisation of monodisperse polystyrene laticee. Colloid and Polymer Science, 252:464-471.
7. 7- Murray C.B., Norris D.J., Bawendi M.G. 1993. Journal of the American Chemical Society, Synthesis and characterization of nearly monodisperse CdE (E = S, Se, Te) semiconductor nanocrystallites. 115: 8706.
8. 8- Potter B.G., Simmons J.H. 1988. Physical Review B. Quantum size effects in optical properties of CdS-glass composites 37: 10838.

9. 9- Liu J., Sheina E., Kolawlewski T., Mccullough R.D. 2002. Angewandte Chemie International Edition, Tuning the Electrical Conductivity and Self-assembly of Regioregular Polythiophene by Block Copolymerization: Nanowire Morphologies in New Di- and Triblock Copolymers, 41: 3259.
10. 10- Watson K.J., Zhu J., Nguyen S.T., Mirkin C.A. 2000. “Redox-Active Polymer-Nanoparticle. Hybrid Materials Pure and Applied Chemistry, 72: 67-72.