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

被引：44

作者：

Farva, Umme ^{[1
]}

Park, Chinho ^{[1
]}

机构：

[1] Yeungnam Univ, Sch Display & Chem Engn, Gyongsan 712749, South Korea

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2010年 / 94卷 / 02期

关键词：

Cadmium selenide; Nanocrystal; Thermal annealing; X-ray diffraction (XRD); Photoluminescence (PL) spectroscopy; QUANTUM DOTS; PHASE-TRANSFORMATION; THIN-FILMS; NANOCRYSTALS; MONODISPERSE; PHOTOLUMINESCENCE; MORPHOLOGY; OXIDE; SE;

D O I：

10.1016/j.solmat.2009.10.003

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

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.

引用

页码：303 / 309

页数：7

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