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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 21860–21874

Comparison of emission characteristics between the CdZnO/ZnO quantum wells on ZnO and GaN templates

Shao-Ying Ting, Yu-Feng Yao, Wei-Lun Chung, Wen-Ming Chang, Chih-Yen Chen, Hao-Tsung Chen, Che-Hao Liao, Horng-Shyang Chen, Chieh Hsieh, and C. C. Yang  »View Author Affiliations


Optics Express, Vol. 20, Issue 20, pp. 21860-21874 (2012)
http://dx.doi.org/10.1364/OE.20.021860


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Abstract

CdZnO/ZnO quantum well (QW) samples are grown on GaN and ZnO templates with plasma-assisted molecular beam epitaxy under different conditions of substrate temperature, Cd effusion cell temperature, and O2 flow rate for emission characteristics comparison. It is found that the Cd incorporation on the ZnO template is generally lower, when compared with that on the GaN template, such that the O2 flow rate needs to be reduced for stoichiometric CdZnO/ZnO QW growth on the ZnO template. Besides the wurtzite (wt) CdZnO structure, the rock-salt (rs) CdZnO structure exists in the CdZnO well layers when the total Cd content is high. The rs structure may dominate over the wt structure in photoluminescence intensity when the total Cd content is high. In either group of samples on the GaN and ZnO templates, the emission efficiency first increases and then decreases with increasing total Cd content. The low emission efficiency at low (high) Cd content is attributed to the weaker quantum confinement (the poorer crystal quality) of the QWs. The emission efficiencies of the QW samples on the GaN template are generally higher than those on the ZnO template. The carrier localization behavior in a CdZnO/ZnO QW, grown on either GaN or ZnO template, is significantly weaker than that in an InGaN/GaN QW. The strength of the quantum-confined Stark effect generally increases with increasing Cd content in either group of samples on the GaN and ZnO templates.

© 2012 OSA

OCIS Codes
(160.6000) Materials : Semiconductor materials
(300.6470) Spectroscopy : Spectroscopy, semiconductors

ToC Category:
Materials

History
Original Manuscript: July 12, 2012
Manuscript Accepted: September 3, 2012
Published: September 10, 2012

Citation
Shao-Ying Ting, Yu-Feng Yao, Wei-Lun Chung, Wen-Ming Chang, Chih-Yen Chen, Hao-Tsung Chen, Che-Hao Liao, Horng-Shyang Chen, Chieh Hsieh, and C. C. Yang, "Comparison of emission characteristics between the CdZnO/ZnO quantum wells on ZnO and GaN templates," Opt. Express 20, 21860-21874 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-20-21860


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