Optical characterization of CdS nanocrystals in Al2O3 matrices fabricated by ion-beam synthesis

被引：54

作者：

Matsuura, D

Kanemitsu, Y ^{[1
]}

Kushida, T

White, CW

Budai, JD

Meldrum, A

机构：

[1] Nara Inst Sci & Technol, Grad Sch Mat Sci, Nara 6300101, Japan

[2] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA

[3] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

来源：

APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 15期

关键词：

D O I：

10.1063/1.1316777

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have studied optical properties of CdS nanocrystals formed by sequential Cd+ and S+ ion implantation into Al2O3 matrices. Two bands related to free excitons in the wurtzite CdS are clearly observed in the absorption spectrum at low temperatures. Efficient photoluminescence (PL) appears near the absorption edge. At high temperatures, the band edge PL band consists of two components. One is the free-exciton emission with a short lifetime (several hundreds of picoseconds), while the other is the bound exciton emission at shallow localized states with a long lifetime (several nanoseconds). The temperature dependence of the band gap energy has been determined for wurtzite CdS nanocrystals. Spectroscopic analysis shows that high-quality compound semiconductor nanocrystals are fabricated by the ion-beam synthesis technique. (C) 2000 American Institute of Physics. [S0003-6951(00)03241-1].

引用

页码：2289 / 2291

页数：3

共 14 条

[1] Semiconductor clusters, nanocrystals, and quantum dots [J].