Sahoo et al. (2009) Phonon confinement and substitutional disorder in Cd1-xZnxS Nanocrystals

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Phonon confinement and substitutional disorder in Cd1-xZnxS Nanocrystals

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CONTRIBUTORS:

	Author:	Sahoo, Satyaprakash (Indira Gandhi Centre for Atomic Research)
	Author:	Dhara, S. (Indira Gandhi Centre for Atomic Research)
	Author:	Shivasubramanian, V.
	Author:	Kalavathi, S.
	Author:	Arora, A. K.

JOURNAL:

J. Raman Spectroscopy 2008 DOI: 10.1002/jrs.2232., 40(8), 1050 - 1054.

YEAR:

2009

PUB TYPE:

Journal Article

SUBJECT(S):

Phonon confinement, Substitutional disorder, CdZnS, Nanocrystals, Ternary semiconductor

DISCIPLINE:

Physics

HTTP:

http://www3.interscience.wiley.com/journal/3420/home?CRETRY=1&SRETRY=0

LANGUAGE:

English

PUB ID:

103-446-895 (Last edited on 2009/08/22 09:44:35 GMT-6)

SPONSOR(S):

ABSTRACT:
1-LO optical phonons in free-standing mixed Cd1-xZnxS nanocrystals, synthesized using chemical precipitation, are investigated using Raman spectroscopy. As expected for the nanocrystals, the 1-LO modes are found to appear at slightly lower frequencies than those in the bulk mixed crystals and exhibit one mode behavior. On the other hand, the line broadening is found to be much more than that can be accounted on the basis of phonon confinement. From the detailed line shape analysis it turns out that the substitutional disorder in the mixed crystals contributes much more to the line broadening than the phonon confinement. The linewidth arising from these mechanisms are also extracted from the analysis.

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