Influence of thermal annealing on the structural and optical properties of CdSe nanoparticles

Title
Influence of thermal annealing on the structural and optical properties of CdSe nanoparticles
Author(s)
박진호움메 파르바[움메 파르바]
Keywords
HYBRID SOLAR-CELLS; QUANTUM DOTS; PHASE-TRANSFORMATION; THIN-FILMS; NANOCRYSTALS; SURFACE; MONODISPERSE; PHOTOLUMINESCENCE; STABILIZATION; PERFORMANCE
Issue Date
201002
Publisher
ELSEVIER SCIENCE BV
Citation
SOLAR ENERGY MATERIALS AND SOLAR CELLS, v.94, no.2, pp.303 - 309
Abstract
CdSe nanocrystals of similar to 3-4 nm size have been synthesized by hot-injection method. The influence of thermal annealing in air- or N(2)-atomosphere oil the morphology and optoelectronic properties of synthesized CdSe nanoparticles has been elucidated. The CdSe nanoparticles showed phase transformation upon annealing in air at 350 degrees C from nanocrystalline sphalerite cubic (Zinc Blende, beta-CdSe) structure to hexagonal (Wurtzite, alpha-CdSe) Structure with a binding energy (Cd 3d(5/2) peak) shift of 0.70 eV. Remarkable differences in the morphology and optoelectronic properties between air- and N(2)- annealed CdSe nanoparticles were clearly observed. The intensity of PL emission increased substantially after annealing in air or N(2)-atmosphere at 250 and 350 degrees C, respectively, indicating the improvement of crystallinity and surface passivation characteristics of the CdSe nanocrystals. (C) 2009 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/22901http://dx.doi.org/10.1016/j.solmat.2009.10.003
ISSN
0927-0248
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공과대학 > 화학공학부 > Articles
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