Oxygen in Ge crystals grown by the B₂O₃ encapsulated Czochralski method

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• 作者：Ichiro Yonenaga^a ; ^{yonenaga@imr.tohoku.ac.jp} ; Toshinori Taishi^b ; Hideaki Ise^a ; Yu Murao^a ; Kaihei Inoue^a ; Takayuki Ohsawa^a ; Yuki Tokumoto^a ; Yutaka Ohno^a ; Yoshio Hashimoto^c
• 关键词：Germanium ; Oxygen ; Local vibration ; Optical properties ; Thermal donor ; Infrared
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：1 August, 2012
• 卷：407
• 期：15
• 页码：2932-2934
• 文件大小：311 K

摘要

Local vibrations of oxygen in Ge crystals grown by the Czochralski method adopting liquid-B₂O₃ encapsulation and GeO₂ powder doping were investigated by Fourier-transform infrared spectroscopy. Strong absorption peaks at 855 cm^鈭?, originating in local vibration of interstitially dissolved oxygen O_i as Ge-O_i-Ge quasi-molecules, developed depending on the doped amount of GeO₂. Similarly, an absorption peak related to the combined vibration of Ge-O_i-Ge was found at 1264 cm^鈭? and the conversion factor from the peak intensity to the oxygen concentration was evaluated to be 1.15脳10¹⁹ cm^鈭?. By prolonged annealing at 350 掳C an absorption peak developed at 780 cm^鈭?, 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.