Photoreflectance Spectroscopy Characterization of Ge/Si0.16Ge0.84 Multiple Quantum Wells on Ge Virtual Substrate

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Hsu, Hung-Pin ; Yang, Pong-Hong ; Huang, Jeng-Kuang ; Wu, Po-Hung ; Huang, Ying-Sheng ; Li, Cheng ; Huang, Shi-Hao ; Tiong, Kwong-Kau (2013)
  • Publisher: Hindawi Publishing Corporation
  • Journal: Advances in Condensed Matter Physics (issn: 1687-8108, eissn: 1687-8124)
  • Related identifiers: doi: 10.1155/2013/298190
  • Subject: Physics | QC1-999 | Article Subject

We report a detailed characterization of a Ge/Si0.16Ge0.84 multiple quantum well (MQW) structure on Ge-on-Si virtual substrate (VS) grown by ultrahigh vacuum chemical vapor deposition by using temperature-dependent photoreflectance (PR) in the temperature range from 10 to 300 K. The PR spectra revealed a wide range of optical transitions from the MQW region as well as transitions corresponding to the light-hole and heavy-hole splitting energies of Ge-on-Si VS. A detailed comparison of PR spectral line shape fits and theoretical calculation led to the identification of various quantum-confined interband transitions. The temperature-dependent PR spectra of Ge/Si0.16Ge0.84 MQW were analyzed using Varshni and Bose-Einstein expressions. The parameters that describe the temperature variations of various quantum-confined interband transition energies were evaluated and discussed.
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