Table of Contents
Journal of Nanoparticles
Volume 2015, Article ID 105685, 6 pages
http://dx.doi.org/10.1155/2015/105685
Research Article

Width of Nucleation Region of Si Nanocrystal Grains Prepared by Pulsed Laser Ablation with Different Laser Fluence

1College of Physics Science and Technology, Hebei University, Baoding 071002, China
2Key Laboratory of Photo-Electricity Information Materials of Hebei Province, Baoding 071002, China

Received 28 November 2014; Accepted 13 March 2015

Academic Editor: Vincent Gomes

Copyright © 2015 Zechao Deng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Si nanocrystal grains were prepared by pulsed laser ablation with different laser fluence in Ar gas of 10 Pa at room temperature. The as-formed grains in the space deposited on the substrates and distributed in a certain range apart from target. According to the depositing position and radius of grains, the nucleation locations of grains in the space were roughly calculated. The results indicated that the width of nucleation region broadened with increasing of ion densities diagnosed by Langmuir probe, which increased with laser fluence from 2 J/cm2 to 6 J/cm2; that is, width of nucleation region broadened with addition of laser fluence. At the same time, the width broadened with the terminal formation position moving backward and the initial formation position of grains moving toward ablated spot. The experimental results were explained reasonably by nucleation thermokinetic theory.