Confinement and shape effects on the optical spectra of small CdSe nanocrystals

被引:60
作者
Albe, V [1 ]
Jouanin, C [1 ]
Bertho, D [1 ]
机构
[1] Univ Montpellier 2, Etud Semicond Grp, F-34095 Montpellier 05, France
来源
PHYSICAL REVIEW B | 1998年 / 58卷 / 08期
关键词
D O I
10.1103/PhysRevB.58.4713
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A tight-binding model is used to investigate confinement and shape effects on the optical absorption spectrum of CdSe nanocrystals up to 5 nm diam. The effects of size dispersion are studied and we show that to simulate the spectrum of a collection of nanocrystals it is not always sufficient to broaden inhomogeneously the mean diameter cluster spectrum. Our results are compared with calculations based on other methods and show good agreement with experimental data. We have also calculated the absorption spectra of CdSe crystallites with different morphologies: spherical clusters and oblate and prolate elliptic nanocrystals. We have performed a comparison of the energies and absorption bands as a function of the morphological changes and we present a detailed study of the modifications in the features of the optical spectra.
引用
收藏
页码:4713 / 4720
页数:8
相关论文
共 38 条
[31]   LINEAR AND NONLINEAR OPTICAL-PROPERTIES OF CDSE MICROCRYSTALLITES IN GLASSES [J].
TOKIZAKI, T ;
AKIYAMA, H ;
TAKAYA, M ;
NAKAMURA, A .
JOURNAL OF CRYSTAL GROWTH, 1992, 117 (1-4) :603-607
[32]   A SEMI-EMPIRICAL TIGHT-BINDING THEORY OF THE ELECTRONIC-STRUCTURE OF SEMICONDUCTORS [J].
VOGL, P ;
HJALMARSON, HP ;
DOW, JD .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1983, 44 (05) :365-378
[33]   VISIBLE PHOTOLUMINESCENCE FROM POROUS SILICON - A QUANTUM CONFINEMENT EFFECT MAINLY DUE TO HOLES [J].
VOOS, M ;
UZAN, P ;
DELALANDE, C ;
BASTARD, G ;
HALIMAOUI, A .
APPLIED PHYSICS LETTERS, 1992, 61 (10) :1213-1215
[34]   Pseudopotential calculations of nanoscale CdSe quantum dots [J].
Wang, LW ;
Zunger, A .
PHYSICAL REVIEW B, 1996, 53 (15) :9579-9582
[35]   ELECTRONIC-STRUCTURE PSEUDOPOTENTIAL CALCULATIONS OF LARGE (APPROXIMATE-TO-1000 ATOMS) SI QUANTUM DOTS [J].
WANG, LW ;
ZUNGER, A .
JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (08) :2158-2165
[36]   NANOMETER-SIZED SEMICONDUCTOR CLUSTERS - MATERIALS SYNTHESIS, QUANTUM SIZE EFFECTS, AND PHOTOPHYSICAL PROPERTIES [J].
WANG, Y ;
HERRON, N .
JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (02) :525-532
[37]   CLEAVAGE FACES OF WURTZITE CDS AND CDSE - SURFACE RELAXATION AND ELECTRONIC-STRUCTURE [J].
WANG, YR ;
DUKE, CB .
PHYSICAL REVIEW B, 1988, 37 (11) :6417-6424
[38]  
1986, CRC HDB CHEM PHYSICS