Correlation between optical absorption redshift and carrier density in phase change materials
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 delocalizati...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2014
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| Online Access: | https://hdl.handle.net/10356/94425 http://hdl.handle.net/10220/18376 |
| _version_ | 1824456138071998464 |
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| author | Ho, H. W. Song, W. D. Bai, K. Branicio, P. S. Tan, Teck L. Ji, R. Law, L. T. Ng, C. M. Lan, Wang. |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Ho, H. W. Song, W. D. Bai, K. Branicio, P. S. Tan, Teck L. Ji, R. Law, L. T. Ng, C. M. Lan, Wang. |
| author_sort | Ho, H. W. |
| collection | NTU |
| description | 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. |
| first_indexed | 2025-02-19T03:49:20Z |
| format | Journal Article |
| id | ntu-10356/94425 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:49:20Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/944252023-02-28T19:39:17Z Correlation between optical absorption redshift and carrier density in phase change materials Ho, H. W. Song, W. D. Bai, K. Branicio, P. S. Tan, Teck L. Ji, R. Law, L. T. Ng, C. M. Lan, Wang. School of Physical and Mathematical Sciences DRNTU::Science::Physics::Optics and light 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. ASTAR (Agency for Sci., Tech. and Research, S’pore) Published version 2014-01-03T02:38:27Z 2019-12-06T18:55:48Z 2014-01-03T02:38:27Z 2019-12-06T18:55:48Z 2013 2013 Journal Article 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-. 0021-8979 https://hdl.handle.net/10356/94425 http://hdl.handle.net/10220/18376 10.1063/1.4822311 en Journal of applied physics © 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: [http://dx.doi.org/10.1063/1.4822311]. 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. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Optics and light Ho, H. W. Song, W. D. Bai, K. Branicio, P. S. Tan, Teck L. Ji, R. Law, L. T. Ng, C. M. Lan, Wang. Correlation between optical absorption redshift and carrier density in phase change materials |
| title | Correlation between optical absorption redshift and carrier density in phase change materials |
| title_full | Correlation between optical absorption redshift and carrier density in phase change materials |
| title_fullStr | Correlation between optical absorption redshift and carrier density in phase change materials |
| title_full_unstemmed | Correlation between optical absorption redshift and carrier density in phase change materials |
| title_short | Correlation between optical absorption redshift and carrier density in phase change materials |
| title_sort | correlation between optical absorption redshift and carrier density in phase change materials |
| topic | DRNTU::Science::Physics::Optics and light |
| url | https://hdl.handle.net/10356/94425 http://hdl.handle.net/10220/18376 |
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