Radiation-enhanced dislocation glide in 4H-SiC at low temperatures

• Published in: Journal of alloys and compounds Vol. 837; p. 155470
• Main Authors: Yakimov, E.E., Yakimov, E.B.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05.10.2020; Elsevier BV
• Subjects: 4H-SiC; Cathodoluminescence; Electron beam irradiation; Electron beams; Electron irradiation; Gliding; Low temperature; Partial dislocation glide; Stacking fault; Stacking faults; Stacking fault; Electron beam irradiation; 4H-SiC; Cathodoluminescence; Partial dislocation glide
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.155470

The expansion of single-layer Shockley-type stacking faults (SSFs) in 4H-SiC under low energy electron beam irradiation has been studied in the temperature range from 80 to 300 K. It is shown that the SSF expansion can be observed even at 80 K. The activation energy for gliding of the Si-core 30° partial dislocations, which drive the SSF expansion under electron beam irradiation with current in the range from 20 to 100 nA, does not exceed 6 meV. The dislocation velocity is found to linearly increase with beam current at all temperatures used in the experiment. The observed enhancement of dislocation velocity is assumed to be determined by the recombination enhanced dislocation glide mechanism. The energy redirected by the nonradiative dislocation related recombination sites to overcome the Peierls barrier is estimated to be larger than 1.3 eV. •Stacking faults expansion in 4H-SiC under electron beam irradiation has been studied in the 80-300 K temperature range.•Electron beam irradiation can stimulate Si-core partial dislocation glide in 4H-SiC even at 80 K.•The activation energy for recombination enhanced dislocation glide does not exceed 6 meV.