Excitonic properties of ordered and disordered SiGe nanocrystals

被引：2
|
作者：
de Oliveira, E. L. [2 ]
Albuquerque, E. L. [2 ]
de Sousa, J. S. [1 ]
Farias, G. A. [1 ]
机构：
[1] Univ Fed Ceara, Dept Fis, BR-60455900 Fortaleza, Ceara, Brazil
[2] Univ Fed Rio Grande do Norte, Dept Fis, BR-59072900 Natal, RN, Brazil
来源：
MICROELECTRONICS JOURNAL | 2009年 / 40卷 / 4-5期
关键词：
Core-shell quantum dots; Alloyed nanostructures; Quantum confinement; PHOTOLUMINESCENCE;
D O I：
10.1016/j.mejo.2008.11.040
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The excitonic properties of ordered and disordered Si/Ge nanocrystals (NCs) are investigated by means of ab initio calculations. In the former group, we investigate Si(core)/Ge(shell) and Ge(core)/Si(shell) NCs, while alloyed Si1-xGex NCs are studied in the latter focusing on the role of the molar fraction x. Concerning ordered NCs, we show that Ge/Si (Si/Ge) NCs exhibit type II confinement in the conduction (valence) band. As for disordered NCs, we show that optical gaps and radiative recombination lifetimes decrease with x. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：762 / 765
页数：4
相关论文
共 50 条
  • [21] Transport properties of ordered and disordered CoAl and CoTi alloy films
    Kim, KW
    Kudryavtsev, YV
    Rhee, JY
    Lee, YP
    EUROPEAN MAGNETIC MATERIALS AND APPLICATIONS, 2001, 373-3 : 597 - 600
  • [22] MICROSCOPIC PROPERTIES OF ORDERED AND DISORDERED ZNSE-GE INTERFACES
    QUARESIMA, C
    PATELLA, F
    SETTE, F
    CAPASSO, C
    SAVOIA, A
    PERFETTI, P
    MARGARITONDO, G
    JOURNAL DE PHYSIQUE, 1984, 45 (NC-5): : 395 - 399
  • [23] Magnetic properties of ordered and disordered spinel-phase ferrimagnets
    Willard, MA
    Nakamura, Y
    Laughlin, DE
    McHenry, ME
    JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1999, 82 (12) : 3342 - 3346
  • [24] Physical properties of the ordered and disordered Ni2MnGa
    Kim, KW
    Kudryavtsev, YV
    Rhee, JY
    Lee, YP
    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2004, 272 : 1176 - 1177
  • [25] Stability and structural properties of vacancy-ordered and -disordered ZrCx
    Davey, Theresa
    Suzuki, Ken
    Miura, Hideo
    Chen, Ying
    RSC ADVANCES, 2021, 11 (52) : 32573 - 32589
  • [26] Ordered, disordered, collapsed
    Alexandra Navrotsky
    Nature Materials, 2003, 2 : 571 - 572
  • [27] Preparation and excitonic properties of high quality organic-inorganic nanocomposite CdSe nanocrystals
    Hashizume, K
    Suzuki, H
    Vacha, M
    Tani, T
    PROCEEDINGS OF THE 2000 INTERNATIONAL CONFERENCE ON EXCITONIC PROCESSES IN CONDENSED MATTER, 2001, : 209 - 212
  • [28] Preparation and excitonic properties of high quality organic-inorganic nanocomposite CdSe nanocrystals
    Hashizume, K
    Suzuki, H
    Vacha, M
    Tani, T
    INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 2001, 15 (28-30): : 3777 - 3780
  • [29] Excitonic luminescence spectra of hexagonal CuBr nanocrystals
    A. I. Ekimov
    I. A. Kudryavtsev
    O. G. Lyublinskaya
    Physics of the Solid State, 1997, 39 : 1479 - 1480
  • [30] The fine structure of excitonic levels in CdSe nanocrystals
    S. V. Gupalov
    E. L. Ivchenko
    Physics of the Solid State, 2000, 42 : 2030 - 2038
12345