Please use this identifier to cite or link to this item:
Title: Correlation between optical absorption redshift and carrier density in phase change materials
Authors: Ho, H. W.
Song, W. D.
Bai, K.
Branicio, P. S.
Tan, Teck L.
Ji, R.
Law, L. T.
Ng, C. M.
Lan, Wang.
Keywords: DRNTU::Science::Physics::Optics and light
Issue Date: 2013
Source: Ho, H. W., Song, W. D., Bai, K., Branicio, P. S., Tan, T. L., Ji, R., et al. (2013). Correlation between optical absorption redshift and carrier density in phase change materials. Journal of applied physics, 114(12), 123504-.
Series/Report no.: Journal of applied physics
Abstract: Here, we report an optical absorption redshift map for GeTe-Sb2Te3 pseudo-binary alloys. We found that, with phase change from amorphous to crystalline, the observed redshift increases with Ge concentration along pseudo-line of compositions, which directly reflects the enhanced electron delocalization/resonant bonding and increased carrier concentrations in the respective crystal compounds. The measured valence band maximum shift towards the Fermi energy from amorphous to crystalline phase supports the observed similar trend in redshift and carrier density. We show that the correlation between optical redshift and carrier density, attributed to the resonant bonding, can be rationalized by calculating the valence electron concentration, the ionicity, and hybridization.
ISSN: 0021-8979
DOI: 10.1063/1.4822311
Rights: © 2013 AIP Publishing LLC. This paper was published in Journal of Applied Physics and is made available as an electronic reprint (preprint) with permission of AIP Publishing LLC. The paper can be found at the following official DOI: [].  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

Files in This Item:
File Description SizeFormat 
Correlation between optical absorption redshift and carrier density in phase change.pdf722.76 kBAdobe PDFThumbnail

Google ScholarTM



Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.