Novel studies in telluride-based phase change materials

Today, telluride-based phase change materials (PCM) are well-suited for data storage applications owing to the large optical and electrical contrasts between phases. Hence, it is important to understand the origin for such fast crystallization as well as explore new materials which better suits appl...

Full description

Saved in:
Bibliographic Details
Main Author: Ho, Hui Wen
Other Authors: Song Wendong
Format: Theses and Dissertations
Language:English
Published: 2015
Subjects:
Online Access:https://hdl.handle.net/10356/64791
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-64791
record_format dspace
spelling sg-ntu-dr.10356-647912023-02-28T23:34:54Z Novel studies in telluride-based phase change materials Ho, Hui Wen Song Wendong Wang Lan School of Physical and Mathematical Sciences DRNTU::Science::Chemistry Today, telluride-based phase change materials (PCM) are well-suited for data storage applications owing to the large optical and electrical contrasts between phases. Hence, it is important to understand the origin for such fast crystallization as well as explore new materials which better suits application. This thesis first presents a unique property of PCM- redshift in the absorption peak of the crystalline phase relative to its amorphous phase, due to increase in electron delocalization I resonant bonding in the crystalline phase. This phenomenon is explained using the first principle calculations. In addition, the redshift increases with Ge concentration along the GeTe-Sb2 Te3 pseudo-binary line has similar trend as the carrier concentration along the line. These correlations will be addressed in this thesis. Second part of thesis introduces an anomalous PCM, Fe-Te. Its optical and electrical PC properties are anomalous to conventional PCM. This anomalous phenomenon is understood by the derived activation energy, the absorption blueshift and valence band characteristics. DOCTOR OF PHILOSOPHY (SPMS) 2015-06-04T04:03:13Z 2015-06-04T04:03:13Z 2014 2014 Thesis Ho, H. W. (2014). Novel studies in telluride-based phase change materials. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/64791 10.32657/10356/64791 en 128 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Chemistry
spellingShingle DRNTU::Science::Chemistry
Ho, Hui Wen
Novel studies in telluride-based phase change materials
description Today, telluride-based phase change materials (PCM) are well-suited for data storage applications owing to the large optical and electrical contrasts between phases. Hence, it is important to understand the origin for such fast crystallization as well as explore new materials which better suits application. This thesis first presents a unique property of PCM- redshift in the absorption peak of the crystalline phase relative to its amorphous phase, due to increase in electron delocalization I resonant bonding in the crystalline phase. This phenomenon is explained using the first principle calculations. In addition, the redshift increases with Ge concentration along the GeTe-Sb2 Te3 pseudo-binary line has similar trend as the carrier concentration along the line. These correlations will be addressed in this thesis. Second part of thesis introduces an anomalous PCM, Fe-Te. Its optical and electrical PC properties are anomalous to conventional PCM. This anomalous phenomenon is understood by the derived activation energy, the absorption blueshift and valence band characteristics.
author2 Song Wendong
author_facet Song Wendong
Ho, Hui Wen
format Theses and Dissertations
author Ho, Hui Wen
author_sort Ho, Hui Wen
title Novel studies in telluride-based phase change materials
title_short Novel studies in telluride-based phase change materials
title_full Novel studies in telluride-based phase change materials
title_fullStr Novel studies in telluride-based phase change materials
title_full_unstemmed Novel studies in telluride-based phase change materials
title_sort novel studies in telluride-based phase change materials
publishDate 2015
url https://hdl.handle.net/10356/64791
_version_ 1759853636000677888