Optical properties of ZnO:Al epilayers:: Observation of room-temperature many-body absorption-edge singularity -: art. no. 121201

被引:58
作者
Makino, T [1 ]
Tamura, K
Chia, CH
Segawa, Y
Kawasaki, M
Ohtomo, A
Koinuma, H
机构
[1] RIKEN, Inst Phys & Chem Res, Photodynam Res Ctr, Sendai, Miyagi 9800845, Japan
[2] Univ Grenoble 1, Spectrometrie Phys Lab, CNRS, UMR 5588, F-38402 St Martin Dheres, France
[3] Tokyo Inst Technol, Dept Innovat & Engineered Mat, Yokohama, Kanagawa 2268502, Japan
[4] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808577, Japan
[5] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[6] Tokyo Inst Technol, Frontier Collaborat Res Ctr, Yokohama, Kanagawa 2268503, Japan
关键词
D O I
10.1103/PhysRevB.65.121201
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied the evolution of optical absorption spectra in eight samples of n type ZnO:Al as a function of excess electron concentration up to 6.7x10(20) cm(-3) at 300 K. The spectral assignment is examined by taking the many-body effect due to the presence of high-density electron gas into account. We propose that absorption-edge singularity induced by many-body Coulomb effect is observed for the concentration up to 4.8x10(19) cm(-3) at room temperature. Such edge singularity has been so far observed at temperatures less than 50 K in other semiconductors. The strong Coulomb interaction between electrons and holes inherent to ZnO may be related to the persistence of the edge singularity up to room-temperature.
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页码:1 / 4
页数:4
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