Nano Archive

Thermally Induced Nano-Structural and Optical Changes of nc-Si:H Deposited by Hot-Wire CVD

Arendse, C. J. and Malgas, G. F. and Muller, T. F. G. and Knoesen, D. and Oliphant, C. J. and Motaung, D. E. and Halindintwali, S. and Mwakikunga, B. W. (2009) Thermally Induced Nano-Structural and Optical Changes of nc-Si:H Deposited by Hot-Wire CVD. Nanoscale Research Letters, 4 (4). pp. 307-312.

[img]
Preview
PDF
315Kb

Official URL: http://www.springerlink.com/content/k534003642433g...

Abstract

We report on the thermally induced changes of the nano-structural and optical properties of hydrogenated nanocrystalline silicon in the temperature range 200–700 °C. The as-deposited sample has a high crystalline volume fraction of 53% with an average crystallite size of ~3.9 nm, where 66% of the total hydrogen is bonded as ≡Si–H monohydrides on the nano-crystallite surface. A growth in the native crystallite size and crystalline volume fraction occurs at annealing temperatures ≥400 °C, where hydrogen is initially removed from the crystallite grain boundaries followed by its removal from the amorphous network. The nucleation of smaller nano-crystallites at higher temperatures accounts for the enhanced porous structure and the increase in the optical band gap and average gap.

Item Type:Article
Uncontrolled Keywords:Hot-wire CVD - Quantum size effects - Nano-crystallite - Optical band gap
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Physical Science > Quantum phenomena
ID Code:4150
Deposited By:Lesley Tobin
Deposited On:12 Nov 2009 15:51
Last Modified:12 Nov 2009 15:51

Repository Staff Only: item control page