Size-dependent structure of CdSe nanoclusters formed after ion implantation in MgO

被引：10
|
作者：
van Huis, MA
van Veen, A
Schut, H
Eijt, SWH
Kooi, BJ
De Hosson, JTM
机构：
[1] Univ Groningen, Dept Appl Phys, Ctr Mat Sci, NL-9747 AG Delft, Netherlands
[2] Univ Groningen, Netherlands Inst Met Res, NL-9747 AG Delft, Netherlands
来源：
ACTA MATERIALIA | 2005年 / 53卷 / 05期
关键词：
phase transformations; precipitation; high-resolution electron microscopy; positron annihilation; compound semiconductors;
D O I：
10.1016/j.actamat.2004.11.023
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The band gap as well as the optical and structural properties of semiconductor CdSe nanoclusters change as a function of the nanocluster size. Embedded CdSe nanoclusters in MgO were created by means of sequential Cd and Se ion implantation followed by thermal annealing. Changes during annealing were monitored using optical absorption and positron annihilation spectroscopy. High-resolution TEM on cross-sections after annealing at a temperature of 1300 K showed that clusters with a size below 5 nm have the high-pressure rock-salt structure and are in a cube-on-cube orientation relation with MgO, whereas clusters larger than 5 nm adopt the stable wurtzite crystal structure and were observed in two different orientation relations with MgO. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1305 / 1311
页数：7
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