Nanostructures, surface characterization and optical properties of chemically synthesized CdTe quantum dots
Journal Title: IOSR Journal of Applied Physics (IOSR-JAP) - Year 2018, Vol 10, Issue 6
Abstract
Molar concentrations of chemical ingredients in synthesis of nanocrystals were found significant roles in the structural, surface morphology and visible range optical properties of CdTe quantum dots thin films. XRD, FESEM and UV spectrum analysis revealed that the average particle sizes approach 6-11nm quantum dots with increasing molar concentrations. The study of X-ray line profiles proved that peak intensity was increased with increasing of Cd+2 and Te2- ions in the films. The phase structure of the films were found to possess cubic zinc blend structure with (100), (110), (200), (220) and (321) reflection planes at x = 0.1, 0.2, 0.4 and 0.6M and additional planes were also observed at x = 0.8M. In all the films, (200) reflection plane showed most prominent which facilitated estimation of nanoparticle sizes. The sized dependent nanoparticles showed maximum absorption blue shift near 325nm wavelength in ultraviolet regime ascribed as first excitonic transition. This may be attributed with decreasing particle sizes indicating increasing band gap.
Authors and Affiliations
M. Rasmani Devi1 ,, S. Jogita Devi 2, K. Kunjabali Singh3
Keywords
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- EP ID EP432002
- DOI 10.9790/4861-1006022431
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