Investigation of phase transition of Ge2 Sb2 Te5 and N-incorporated Ge2 Sb2 Te5 films using x-ray absorption spectroscopy

Youngkuk Kim, M. H. Jang, K. Jeong, M. H. Cho, K. H. Do, D. H. Ko, H. C. Sohn, Min Gyu Kim

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

For this study, the phase-change materials Ge2 Sb2 Te5 and N-doped Ge2 Sb2 Te5 films were investigated using x-ray absorption near-edge structure and extended x-ray absorption fine structure. During the phase transition, change in electronic structure is observed by the shift of the absorption edge energy, i.e., structural coordination of Ge-Te changes from tetrahedral to octahedral coordination, of which the interatomic distances are 3.12 and 2.83 Å, respectively. In addition, nitrogen incorporation into the film led to a p-p orbital hybridization and a different crystallization behavior. The hybridization caused by the formation of a Ge-N bond was related to suppression of the phase transition.

Original languageEnglish
Article number061910
JournalApplied Physics Letters
Volume92
Issue number6
DOIs
Publication statusPublished - 2008 Feb 22

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x ray absorption
x ray spectroscopy
absorption spectroscopy
phase change materials
fine structure
retarding
crystallization
electronic structure
nitrogen
orbitals
shift
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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title = "Investigation of phase transition of Ge2 Sb2 Te5 and N-incorporated Ge2 Sb2 Te5 films using x-ray absorption spectroscopy",
abstract = "For this study, the phase-change materials Ge2 Sb2 Te5 and N-doped Ge2 Sb2 Te5 films were investigated using x-ray absorption near-edge structure and extended x-ray absorption fine structure. During the phase transition, change in electronic structure is observed by the shift of the absorption edge energy, i.e., structural coordination of Ge-Te changes from tetrahedral to octahedral coordination, of which the interatomic distances are 3.12 and 2.83 {\AA}, respectively. In addition, nitrogen incorporation into the film led to a p-p orbital hybridization and a different crystallization behavior. The hybridization caused by the formation of a Ge-N bond was related to suppression of the phase transition.",
author = "Youngkuk Kim and Jang, {M. H.} and K. Jeong and Cho, {M. H.} and Do, {K. H.} and Ko, {D. H.} and Sohn, {H. C.} and Kim, {Min Gyu}",
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language = "English",
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Investigation of phase transition of Ge2 Sb2 Te5 and N-incorporated Ge2 Sb2 Te5 films using x-ray absorption spectroscopy. / Kim, Youngkuk; Jang, M. H.; Jeong, K.; Cho, M. H.; Do, K. H.; Ko, D. H.; Sohn, H. C.; Kim, Min Gyu.

In: Applied Physics Letters, Vol. 92, No. 6, 061910, 22.02.2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Investigation of phase transition of Ge2 Sb2 Te5 and N-incorporated Ge2 Sb2 Te5 films using x-ray absorption spectroscopy

AU - Kim, Youngkuk

AU - Jang, M. H.

AU - Jeong, K.

AU - Cho, M. H.

AU - Do, K. H.

AU - Ko, D. H.

AU - Sohn, H. C.

AU - Kim, Min Gyu

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Y1 - 2008/2/22

N2 - For this study, the phase-change materials Ge2 Sb2 Te5 and N-doped Ge2 Sb2 Te5 films were investigated using x-ray absorption near-edge structure and extended x-ray absorption fine structure. During the phase transition, change in electronic structure is observed by the shift of the absorption edge energy, i.e., structural coordination of Ge-Te changes from tetrahedral to octahedral coordination, of which the interatomic distances are 3.12 and 2.83 Å, respectively. In addition, nitrogen incorporation into the film led to a p-p orbital hybridization and a different crystallization behavior. The hybridization caused by the formation of a Ge-N bond was related to suppression of the phase transition.

AB - For this study, the phase-change materials Ge2 Sb2 Te5 and N-doped Ge2 Sb2 Te5 films were investigated using x-ray absorption near-edge structure and extended x-ray absorption fine structure. During the phase transition, change in electronic structure is observed by the shift of the absorption edge energy, i.e., structural coordination of Ge-Te changes from tetrahedral to octahedral coordination, of which the interatomic distances are 3.12 and 2.83 Å, respectively. In addition, nitrogen incorporation into the film led to a p-p orbital hybridization and a different crystallization behavior. The hybridization caused by the formation of a Ge-N bond was related to suppression of the phase transition.

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