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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 10 — May. 20, 2013
  • pp: 11965–11972

The study of optical band edge property of bismuth oxide nanowires α-Bi2O3

Ching-Hwa Ho, Ching-Hsiang Chan, Ying-Sheng Huang, Li-Chia Tien, and Liang-Chiun Chao  »View Author Affiliations

Optics Express, Vol. 21, Issue 10, pp. 11965-11972 (2013)

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The α-phase Bi2O3 (α-Bi2O3) is a crucial and potential visible-light photocatalyst material needless of intentional doping on accommodating band gap. The understanding on fundamental optical property of α-Bi2O3 is important for its extended applications. In this study, bismuth oxide nanowires with diameters from tens to hundreds nm have been grown by vapor transport method driven with vapor-liquid-solid mechanism on Si substrate. High-resolution transmission electron microscopy and Raman measurement confirm α phase of monoclinic structure for the as-grown nanowires. The axial direction for the as-grown nanowires was along < 1 ¯ 22 >. The band-edge structure of α-Bi2O3 has been probed experimentally by thermoreflectance (TR) spectroscopy. The direct band gap was determined accurately to be 2.91 eV at 300 K. Temperature-dependent TR measurements of 30-300 K were carried out to evaluate temperature-energy shift and line-width broadening effect for the band edge of α-Bi2O3 thin-film nanowires. Photoluminescence (PL) experiments at 30 and 300 K were carried out to identify band-edge emission as well as defect luminescence for the α-Bi2O3 nanowires. On the basis of experimental analyses of TR and PL, optical characteristics of direct band edge of α-Bi2O3 nanowires have thus been realized.

© 2013 OSA

OCIS Codes
(160.4760) Materials : Optical properties
(160.6000) Materials : Semiconductor materials
(300.6380) Spectroscopy : Spectroscopy, modulation
(300.6470) Spectroscopy : Spectroscopy, semiconductors

ToC Category:

Original Manuscript: February 20, 2013
Revised Manuscript: April 23, 2013
Manuscript Accepted: May 4, 2013
Published: May 8, 2013

Ching-Hwa Ho, Ching-Hsiang Chan, Ying-Sheng Huang, Li-Chia Tien, and Liang-Chiun Chao, "The study of optical band edge property of bismuth oxide nanowires α-Bi2O3," Opt. Express 21, 11965-11972 (2013)

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