Semiconducting Nano-Materials: Characterization Techniques
Journal Title: International Journal of Physics, Chemistry and Mathematical Fundamentals (www.ijpcmf.com) - Year 2012, Vol 1, Issue 2
Abstract
The effect of particle size of the II - VI semiconductor nanocrystals on the PL spectrum has been investigated theoretically and experimentally. Blue shift in the PL spectrum has been observed with decreasing size of the nanocrystals. The effective mass approximation, the quantum confinement effect, Coulomb charge interactions, the surface charge polarization etc. have been taken into account apart from the usual band gap energy to arrive at a theoretical model. The theoretical model is consistent with the experimental results. The broadening of the PL spectrum with reducing size may be attributed to the band edge luminescence and the particle size distribution while the peak are assigned to the recombination of holes at the deep defects and electrons at the shallow traps. In monodisperse nanocrystals no broadening in the PL spectrum was observed while in the case of the polydispersed nanocrystals there was broadening in the PL spectrum with reducing size of the crystals.
Authors and Affiliations
Chabbila , Dr. S. B. L. Tripathi , Rajesh Sharma , Dr. Ashwani Sharma
Keywords
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