Journal
OPTICAL AND QUANTUM ELECTRONICS
Volume 55, Issue 14, Pages -Publisher
SPRINGER
DOI: 10.1007/s11082-023-05363-x
Keywords
Dynamic resistance; Quantum dots; Solar cells; Optical parameters
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By optimizing and doping Cu in CdS/CdSe multilayer films, the performance of quantum dot solar cells has been improved. Analysis of optical and electrical parameters indicates that increasing Cu doping concentration can enhance the efficiency of the devices.
In this research, photoanodes on the basis of a CdS/CdSe multilayer film, where CdSe-doped with Cu were successfully fabricated and optimized at a 3% doping concentration. The highest performance of quantum dot solar cells is 4.24%. This result is also confirmed by studying the optical and electrical properties of quantum dot solar cells that change with the Cu doping concentration. The enhanced efficiency can be explained by electrical-optical parameters, which are determined from UV-Vis spectra, J-V curves, and EIS experiments. The optical parameters such as absorption density, the band gap, the top of the valence band, and the bottom of the conduction band are estimated based on the Tauc equation and the UV-Vis spectra experiments for optical properties. Moreover, the electrical parameters, such as the shunt resistance and Rct1 and Rct2 resistances, are also extracted from J-V curves and the electrochemical impedance spectra experiments for electrical properties. Finally, the obtained results are used to explain the enhanced performance efficiency of devices.
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