Oxygen in Ge crystals grown by the B 2O 3 encapsulated Czochralski method

Ichiro Yonenaga, Toshinori Taishi, Hideaki Ise, Yu Murao, Kaihei Inoue, Takayuki Ohsawa, Yuki Tokumoto, Yutaka Ohno, Yoshio Hashimoto

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Local vibrations of oxygen in Ge crystals grown by the Czochralski method adopting liquid-B 2O 3 encapsulation and GeO 2 powder doping were investigated by Fourier-transform infrared spectroscopy. Strong absorption peaks at 855 cm -1, originating in local vibration of interstitially dissolved oxygen O i as Ge-O i-Ge quasi-molecules, developed depending on the doped amount of GeO 2. Similarly, an absorption peak related to the combined vibration of Ge-O i-Ge was found at 1264 cm -1 and the conversion factor from the peak intensity to the oxygen concentration was evaluated to be 1.15×10 19 cm -2. By prolonged annealing at 350 °C an absorption peak developed at 780 cm -1, indicating formation of oxygen-related thermal donors. From the variations of carrier density and oxygen concentration, one donor was found to possess about 15 O i atoms.

Original languageEnglish
Pages (from-to)2932-2934
Number of pages3
JournalPhysica B: Condensed Matter
Issue number15
Publication statusPublished - 2012 Aug 1


  • Germanium
  • Infrared
  • Local vibration
  • Optical properties
  • Oxygen
  • Thermal donor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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