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

被引：45

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

共 33 条

[1] Perspectives on the physical chemistry of semiconductor nanocrystals [J].

Alivisatos, AP .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (31) :13226-13239

[2] Semiconductor nanocrystals as fluorescent biological labels [J].

Bruchez, M ;

Moronne, M ;

Gin, P ;

Weiss, S ;

Alivisatos, AP .

SCIENCE, 1998, 281 (5385) :2013-2016

[3] ELECTRONIC WAVE-FUNCTIONS IN SEMICONDUCTOR CLUSTERS - EXPERIMENT AND THEORY [J].

BRUS, L .

JOURNAL OF PHYSICAL CHEMISTRY, 1986, 90 (12) :2555-2560

[4] CHANGES IN SURFACE CRYSTALLINITY AND MORPHOLOGY OF CDS AND CDSE PHOTOELECTRODES UPON USE IN POLYSULFIDE ELECTROLYTE [J].

CAHEN, D ;

VAINAS, B ;

VANDENBERG, JM .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1981, 128 (07) :1484-1488

[5] Peptide-labeled near-infrared quantum dots for imaging tumor vasculature in living subjects [J].

Cai, WB ;

Shin, DW ;

Chen, K ;

Gheysens, O ;

Cao, QZ ;

Wang, SX ;

Gambhir, SS ;

Chen, XY .

NANO LETTERS, 2006, 6 (04) :669-676

[6] Tuning the properties of CdSe nanoparticles in reverse micelles [J].

Chandrasekharan, N ;

Kamat, PV .

RESEARCH ON CHEMICAL INTERMEDIATES, 2002, 28 (7-9) :847-856

[7] Synthesis of size-controlled CdSe quantum dots and characterization of CdSe-conjugated polymer blends for hybrid solar cells [J].

Choi, SH ;

Song, HJ ;

Park, IK ;

Yum, JH ;

Kim, SS ;

Lee, SH ;

Sung, YE .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2006, 179 (1-2) :135-141

[8] Electroluminescence from single monolayers of nanocrystals in molecular organic devices [J].

Coe, S ;

Woo, WK ;

Bawendi, M ;

Bulovic, V .

NATURE, 2002, 420 (6917) :800-803

[9] Physicochemical evaluation of the hot-injection method, a synthesis route for monodisperse nanocrystals [J].

Donegá, CD ;

Liljeroth, P ;

Vanmaekelbergh, D .

SMALL, 2005, 1 (12) :1152-1162

[10] High-performance thin-film transistors using semiconductor nanowires and nanoribbons [J].

Duan, XF ;

Niu, CM ;

Sahi, V ;

Chen, J ;

Parce, JW ;

Empedocles, S ;

Goldman, JL .

NATURE, 2003, 425 (6955) :274-278

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