Improved optical and structural properties of cadmium sulfide nanostructures for optoelectronic applications |
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| Affiliation: | 5. Central Laboratory, College of Science & Department of Zoology, King Saud University, Riyadh, 11451, Saudi Arabia;1. Institute for Energy Research, Jiangsu University, Zhenjiang 212013, PR China;2. Department of Material Science, Fudan University, Shanghai 200433, PR China;1. Department of Applied Science, University of Technology, Baghdad, Iraq;2. Department of Physics, College of Education, University of Tikrit, Tikret, Iraq;1. Shibaura Institute of Technology, College of Engineering, 337–8570 Saitama, Japan;2. College of Physics and Optoelectronic Engineering, Shenzhen University, 518060 Shenzhen, China;3. Institute of Semiconductor Physics, National Academy of Sciences, 03680 Kyiv, Ukraine;4. King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia;5. Department of Physics, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;6. Advanced Functional Materials and Optoelectronics Laboratory (AFMOL), Department of Physics, College of Science, King Khalid University, Abha 61413, Saudi Arabia;7. School of Physics and Astronomy, Queen Mary University of London, Mile End, London E1 4NS, UK |
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| Abstract: | In this study, the effect of ZnO seed layer on the growth of uniform CdS nanostructures was investigated using chemical bath deposition technique. Besides, the influence of molar concentration of reagents on the surface morphology, structural and optoelectrical properties of the deposited CdS thin films were examined. The CdS nanostructures were grown on bare glass and ZnO/glass substrates with different reagent molar concentrations. The results indicated an improvement in the homogeneity and uniformity of the grown CdS nanostructures on ZnO seed layer which can be due to the low lattice mismatch between ZnO and CdS structures. The CdS/ZnO samples were optimized by changing the molar concentration of reagents. A three–dimensional intersecting vertical nanosheet morphology with hexagonal structure was obtained when modified chemical concentration of 0.5 M was applied. The XRD pattern of CdS nanosheets indicated the hexagonal phase of CdS which were strongly orientated along (002) plane. The elevated intensity of dominant peak related to this sample confirmed the improved crystal quality of this CdS nanostructure comparing to the other samples. The UV–Vis spectrum demonstrated a high absorption coefficient for CdS intersecting nanosheets which might be due to the high specific surface area and light trapping behavior of this sample. The photoluminescence study also showed an improvement in optical properties of optimized CdS nanostructures. In order to study the optoelectrical properties of CdS nanostructures, metal–semiconductor–metal photodetectors were fabricated with different CdS samples and their current–voltage characteristics were analyzed. The results indicated an enhancement in photosensitivity, responsivity, and speed of photodetectors based on optimized CdS nanostructures. |
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| Keywords: | Sensors Optical properties Electrical properties Spectroscopy |
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