Growth of Nb2O5 quantum dots by physical vapor deposition

被引：13

作者：

Dhawan, Sahil ^{[1
]}

Dhawan, Tanuj ^{[2
]}

Vedeshwar, Agnikumar G. ^{[1
]}

机构：

[1] Univ Delhi, Dept Phys & Astrophys, Thin Film Lab, Delhi 110007, India

[2] Univ Delhi, Hans Raj Coll, Dept Phys & Elect, Delhi 110007, India

来源：

MATERIALS LETTERS | 2014年 / 126卷

关键词：

Physical vapor deposition; Quantum dots; Nb2O5; UV-visible and electron microscopy; NIOBIUM; NANOPARTICLES; TA2O5;

D O I：

10.1016/j.matlet.2014.03.107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The crystalline quantum dots of Nb2O5 in the range 1-20 nm have been grown by vacuum thermal evaporation using the bottom-up approach of early nucleation and growth stage. The dot sizes were controlled by growth time for an optimized constant molecular flux rate of growth. The dots were characterized by TEM and UV/Vis absorption spectroscopy. The variation of optical band gap of dots scaling with inverse square of their size demonstrates the quantum confinement effect in the dots. The reduced mass of electron-hole pair (exciton) was determined to be 0.532 m(e) from this behavior. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：32 / 35

页数：4

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