Investigation of heavily nitrogen-doped n+ 4H-SiC crystals grown by physical vapor transport

Noboru Ohtani, Masakazu Katsuno, Masashi Nakabayashi, Tatsuo Fujimoto, Hiroshi Tsuge, Hirokatsu Yashiro, Takashi Aigo, Hosei Hirano, Taizo Hoshino, Kohei Tatsumi

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Abstract

Heavily nitrogen-doped n+ 4H-SiC single crystals were grown by the physical vapor transport (PVT) method. The nitrogen incorporation kinetics in a heavily doped regime was studied in terms of growth temperature dependence, and it was revealed that the growth temperature substantially influenced the amount of nitrogen incorporated into the crystals and their surface step structures on the (0 0 0 1̄)C facet plane. The structural quality of heavily nitrogen-doped 4H-SiC crystals was examined by X-ray rocking curve measurements and defect selective etching by molten KOH at around 500 °C. The crystals contained an extremely low density of 3C-SiC inclusions and stacking faults and showed a comparable crystalline quality to conventionally doped 4H-SiC substrates. Furthermore the structural stability of the heavily nitrogen-doped 4H-SiC substrates during high-temperature treatments has been investigated. The substrates with a large {0 0 0 1} surface roughness showed a resistivity increase after annealing at 1100 °C for 2 h, which was confirmed to be caused by the formation and expansion of double Shockley-type basal plane stacking faults in the substrates. The occurrence of the stacking faults largely depended on the surface preparation conditions of substrates, which indicate that the primary nucleation sites of stacking faults exist in the near-surface regions of substrates.

Original languageEnglish
Pages (from-to)1475-1481
Number of pages7
JournalJournal of Crystal Growth
Volume311
Issue number6
DOIs
Publication statusPublished - 2009 Mar 1

Keywords

  • A1. Defects
  • A1. Doping
  • A1. Surface structure
  • A2. Growth from vapor
  • B2. Semiconducting silicon compounds

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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    Ohtani, N., Katsuno, M., Nakabayashi, M., Fujimoto, T., Tsuge, H., Yashiro, H., Aigo, T., Hirano, H., Hoshino, T., & Tatsumi, K. (2009). Investigation of heavily nitrogen-doped n+ 4H-SiC crystals grown by physical vapor transport. Journal of Crystal Growth, 311(6), 1475-1481. https://doi.org/10.1016/j.jcrysgro.2009.01.119