Optical characterization of single-crystal diamond grown by DC arc plasma jet CVD
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第12期
论文作者：Li-fu Hei Yun Zhao Jun-jun Wei Jin-long Liu Cheng-ming Li Fan-xiu Lü
文章页码：1424 - 1430
摘 要：Optical centers of single-crystal diamond grown by DC arc plasma jet chemical vapor deposition（CVD） were examined using a low-temperature photoluminescence（PL） technique. The results show that most of the nitrogen-vacancy（NV） complexes are present as NV-centers, although some H2 and H3 centers and B-aggregates are also present in the single-crystal diamond because of nitrogen aggregation resulting from high N2 incorporation and the high mobility of vacancies under growth temperatures of 950–1000°C. Furthermore, emissions of radiation-induced defects were also detected at 389, 467.5, 550, and 588.6 nm in the PL spectra. The reason for the formation of these radiation-induced defects is not clear. Although a Ni-based alloy was used during the diamond growth, Ni-related emissions were not detected in the PL spectra. In addition, the silicon-vacancy（Si-V）-related emission line at 737 nm, which has been observed in the spectra of many previously reported microwave plasma chemical vapor deposition（MPCVD） synthetic diamonds, was absent in the PL spectra of the single-crystal diamond prepared in this work. The high density of NV-centers, along with the absence of Ni-related defects and Si-V centers, makes the single-crystal diamond grown by DC arc plasma jet CVD a promising material for applications in quantum computing.
Li-fu Hei，Yun Zhao，Jun-jun Wei，Jin-long Liu，Cheng-ming Li，Fan-xiu Lü
Institute for Advanced Materials and Technology,University of Science and Technology Beijing
摘 要：Optical centers of single-crystal diamond grown by DC arc plasma jet chemical vapor deposition（CVD） were examined using a low-temperature photoluminescence（PL） technique. The results show that most of the nitrogen-vacancy（NV） complexes are present as NV-centers, although some H2 and H3 centers and B-aggregates are also present in the single-crystal diamond because of nitrogen aggregation resulting from high N2 incorporation and the high mobility of vacancies under growth temperatures of 950–1000°C. Furthermore, emissions of radiation-induced defects were also detected at 389, 467.5, 550, and 588.6 nm in the PL spectra. The reason for the formation of these radiation-induced defects is not clear. Although a Ni-based alloy was used during the diamond growth, Ni-related emissions were not detected in the PL spectra. In addition, the silicon-vacancy（Si-V）-related emission line at 737 nm, which has been observed in the spectra of many previously reported microwave plasma chemical vapor deposition（MPCVD） synthetic diamonds, was absent in the PL spectra of the single-crystal diamond prepared in this work. The high density of NV-centers, along with the absence of Ni-related defects and Si-V centers, makes the single-crystal diamond grown by DC arc plasma jet CVD a promising material for applications in quantum computing.
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