EPR, ESE and pulsed ENDOR study of the nitrogen donor pairs on quasi-cubic lattice sites in 6H SiC

D-band EPR, X-band FS ESE and pulsed ENDOR studies of the additional nitrogen (N) related centers observed in highly compensated n-type 6H-SiC wafers are presented. The D-band EPR and X-band FS ESE spectrum consists of the ¹⁴N hyperfine (hf) triplet lines of the N donors incorporated at the two quasi-cubic (N_c1, N_c2) sites with the intensity ratio of I_Nc1/I_Nc2=0.7 and three additional triplet lines. X-band pulsed ENDOR spectra have shown intense ¹⁴N ENDOR signals of N_c1, N_c2 centers and new ¹⁴N lines due to the N related centers N₁, N₂, N₃ with the isotropic hf splitting: 21.04, 26.43, 29.77 MHz, respectively. It was found that the g-tensors of the N₂ and N₃ triplet lines coincide with those of N on quasi-cubic N_c2 site. The g-tensor of the third N₁ triplet lines corresponds to the average value of the N_c1 and N_c2 spectrum: . It was suggested that N₁ center with A_iso=21.04 MHz is due to the spin coupling between N on two quasi-cubic N_c1 and N_c2 sites while two others are tentatively attributed to the N pairs formed between N atoms on one quasi-cubic N_c2 site.

Source:Physica B: Condensed Matter

If you need more information about EPR, ESE and pulsed ENDOR study of the nitrogen donor pairs on quasi-cubic lattice sites in 6H SiC, please visit our website:http://www.qualitymaterial.net, send us email at powerwaymaterial@gmail.com.