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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51566

Title: Optical characterization of a strain compensated GaAs0.64Sb0.36/GaAs0.79P0.21 quantum well structure grown by metal organic vapor phase epitaxy
Authors: C.T. Huang
J.D. Wu
C.F. Liu
Y.S. Huang
C.T. Wan
Y.K. Su
K.K. Tiong
Contributors: 國立臺灣海洋大學:電機工程學系
Date: 2012-06
Issue Date: 2018-12-07T05:49:29Z
Publisher: Materials Chemistry and Physics
Abstract: Abstract: Optical characterization of a strained GaAs0.64Sb0.36/GaAs and a strain-compensated GaAs0.64Sb0.36/GaAs0.79P0.21 triple quantum well (TQW) structures grown by metal organic vapor phase epitaxy has been carried out by using photoreflectance (PR), surface photovoltage spectroscopy (SPS) and photoluminescence (PL) techniques. For the GaAs0.64Sb0.36/GaAs TQW, only a very weak PR feature was observed in the vicinity of fundamental transition. A large blueshift of the peak position of PL feature of the sample at low temperature with increasing of excitation power density has been attributed to a weakly type-II heterojunction formed between GaAs0.64Sb0.36 and GaAs. The PR and surface photovoltage spectra of GaAs0.64Sb0.36/GaAs0.79P0.21 TQW display a series of features originated from interband transitions which is a typical characteristic of type-I QW structure. In order to identify the interband transitions, a calculation was performed based on the envelope function approximation using the conduction band-offset Qc and strain compensation factor γ as adjustable parameters. Good agreement between experimental results and theoretical calculation is achieved by taking Qc = 0.30 ± 0.05 and γ = 0.60 ± 0.05. The results indicate that the energy band of the strain-compensated QW structure is significantly influenced by replacing GaAs barrier by GaAs0.79P0.21 layers, which changes the weakly type-II to a type-I structure. The strain-compensated GaAs0.64Sb0.36/GaAs0.79P0.21 TQW has a larger overlap integral and hence a higher transition probability, providing a possibility for fabricating high efficiency near infrared laser diodes.
Relation: 134(2–3) pp.797–802
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51566
Appears in Collections:[電機工程學系] 期刊論文

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