中国物理B ›› 2019, Vol. 28 ›› Issue (12): 128103-128103.doi: 10.1088/1674-1056/ab53cd

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Multiple enlarged growth of single crystal diamond by MPCVD with PCD-rimless top surface

Ze-Yang Ren(任泽阳), Jun Liu(刘俊), Kai Su(苏凯), Jin-Feng Zhang(张金风), Jin-Cheng Zhang(张进成), Sheng-Rui Xu(许晟瑞), Yue Hao(郝跃)   

  1. State Key Discipline Laboratory of Wide Band-Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an 710071, China
  • 收稿日期:2019-05-27 修回日期:2019-09-18 出版日期:2019-12-05 发布日期:2019-12-05
  • 通讯作者: Jin-Feng Zhang E-mail:jfzhang@xidian.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFB0406504 and 2016YFB0400105) and the National Postdoctoral Program for Innovative Talents, China (Grant No. BX20190263).

Multiple enlarged growth of single crystal diamond by MPCVD with PCD-rimless top surface

Ze-Yang Ren(任泽阳), Jun Liu(刘俊), Kai Su(苏凯), Jin-Feng Zhang(张金风), Jin-Cheng Zhang(张进成), Sheng-Rui Xu(许晟瑞), Yue Hao(郝跃)   

  1. State Key Discipline Laboratory of Wide Band-Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an 710071, China
  • Received:2019-05-27 Revised:2019-09-18 Online:2019-12-05 Published:2019-12-05
  • Contact: Jin-Feng Zhang E-mail:jfzhang@xidian.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFB0406504 and 2016YFB0400105) and the National Postdoctoral Program for Innovative Talents, China (Grant No. BX20190263).

摘要: We report the simultaneous enlarged growth of seven single crystal diamond (SCD) plates free from polycrystalline diamond (PCD) rim by using a microwave plasma chemical vapor deposition (MPCVD) system. Optical microscope and atomic force microscope (AFM) show the typical step-bunching SCD morphology at the center, edge, and corner of the samples. The most aggressively expanding sample shows a top surface area three times of that of the substrate. The effective surface expanding is attributed to the utilization of the diamond substrates with (001) side surfaces, the spacial isolation of them to allow the sample surface expanding, and the adoption of the reported pocket holder. Nearly constant temperature of the diamond surfaces is maintained during growth by only decreasing the sample height, and thus all the other growth parameters can be kept unchanged to achieve high quality SCDs. The SCDs have little stress as shown by the Raman spectra. The full width at half maximum (FWHM) data of both the Raman characteristic peak and (004) x-ray rocking curve of the samples are at the same level as those of the standard CVD SCD from Element Six Ltd. The nonuniformity of the sample thickness or growth rate is observed, and photoluminescence spectra show that the nitrogen impurity increases with increasing growth rate. It is found that the reduction of the methane ratio in the sources gas flow from 5% to 3% leads to decrease of the vertical growth rate and increase of the lateral growth rate. This is beneficial to expand the top surface and improve the thickness uniformity of the samples. At last, the convenience of the growth method transferring to massive production has also been demonstrated by the successful simultaneous enlarged growth of 14 SCD samples.

关键词: diamond, chemical vapour deposition, crystal growth, expanded top surface, polycrystalline diamond rimless

Abstract: We report the simultaneous enlarged growth of seven single crystal diamond (SCD) plates free from polycrystalline diamond (PCD) rim by using a microwave plasma chemical vapor deposition (MPCVD) system. Optical microscope and atomic force microscope (AFM) show the typical step-bunching SCD morphology at the center, edge, and corner of the samples. The most aggressively expanding sample shows a top surface area three times of that of the substrate. The effective surface expanding is attributed to the utilization of the diamond substrates with (001) side surfaces, the spacial isolation of them to allow the sample surface expanding, and the adoption of the reported pocket holder. Nearly constant temperature of the diamond surfaces is maintained during growth by only decreasing the sample height, and thus all the other growth parameters can be kept unchanged to achieve high quality SCDs. The SCDs have little stress as shown by the Raman spectra. The full width at half maximum (FWHM) data of both the Raman characteristic peak and (004) x-ray rocking curve of the samples are at the same level as those of the standard CVD SCD from Element Six Ltd. The nonuniformity of the sample thickness or growth rate is observed, and photoluminescence spectra show that the nitrogen impurity increases with increasing growth rate. It is found that the reduction of the methane ratio in the sources gas flow from 5% to 3% leads to decrease of the vertical growth rate and increase of the lateral growth rate. This is beneficial to expand the top surface and improve the thickness uniformity of the samples. At last, the convenience of the growth method transferring to massive production has also been demonstrated by the successful simultaneous enlarged growth of 14 SCD samples.

Key words: diamond, chemical vapour deposition, crystal growth, expanded top surface, polycrystalline diamond rimless

中图分类号:  (Diamond)

  • 81.05.ug
81.15.Gh (Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)) 68.55.Ln (Defects and impurities: doping, implantation, distribution, concentration, etc.)