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Magnesium Concentration Dependence of Room-Temperature Absorption-Edge Singularity in Alloyed MgZnO Epilayers.
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- Makino Takayuki
- Photodynamics Research Center, RIKEN (Institute of Physical and Chemical Research), Aramaki-aza-Aoba 519-1399, Aoba-ku, Sendai 980-0845
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- Segawa Yusaburo
- Photodynamics Research Center, RIKEN (Institute of Physical and Chemical Research), Aramaki-aza-Aoba 519-1399, Aoba-ku, Sendai 980-0845
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Description
Recently, the absorption-edge singularity model accounting for the interaction between excess electrons and photocreated holes has been applied to room-temperature optical spectra in n-type ZnO epilayers [T. Makino et al.: Phys. Rev. B 65 (2002) 121201(R)]. This model predicts that the onset of the spectrum should exhibit a power-law singularity of the form [(E-E1)-α] with the threshold energy of E1 located near the fundamental gap. The results of our fitting using this model are in fairly good agreement with available experimental data obtained for MgZnO thin films, which were reported by Kang et al. [Solid State Commun. 115 (2000) 127]. The power exponent α, which is related to the magnitude of screening between photocreated carriers relative to that provided by excess electrons, was enhanced with the incorporation of Mg and had a maximum at the Mg concentration of 8%. The possible reasons for this enhancement are discussed.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 71 (12), 2855-2858, 2002
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679160531968
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- NII Article ID
- 110001954154
- 210000103987
- 130004538011
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- NII Book ID
- AA00704814
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- BIBCODE
- 2002JPSJ...71.2855M
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 6393537
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL Search
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed