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Title: Phase instability and defect induced evolution of optical properties in Cd rich-CdS nanoparticles

Although semiconductor nanostructures exhibit improved physical properties, their structural instability is be a problem for technological applications. This paper reports a temperature-induced low energy phase transformation that occurs in CdS nanoparticles which is ascribed to thermally generated stacking-faults. The phase transformation is found to change the nature of lattice strain in the samples. The formation of this defect-induced lattice strain and its influence on the physical properties of the samples are investigated. The modified optical absorption and emission properties of the samples are thoroughly studied. Using resonance Raman spectroscopy, the evolution of electron-phonon (e-p) coupling strength with structural changes is studied. An explanation to the contradictory nature of e-p coupling strength observed in the nano-regime is given.
Authors:
;  [1]
  1. Department of Physics, S B College, Changanassery, Kerala 686101 (India)
Publication Date:
OSTI Identifier:
22273492
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CADMIUM; CADMIUM SULFIDES; ELECTRON-PHONON COUPLING; NANOSTRUCTURES; OPTICAL PROPERTIES; PHASE TRANSFORMATIONS; RAMAN SPECTROSCOPY; SEMICONDUCTOR MATERIALS; STACKING FAULTS; STRAINS