Measurement of nitrogen atom flux and growth of β-si 3 N 4 on Si(111) by RF-discharge
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1 Measurement of nitrogen atom flux and growth of β-si 3 N 4 on Si(111) by RF-discharge Tadashi Ohachi, Nobuhiko Yamabe, and Motoi Wada Atom nitrogen flux created by the inductive coupling rf discharge was measured by the self ionization of N atoms on negatively biased electrode. The reaction between N atom of the Surface reaction of Si and N atoms produces β-si 3 N 4. The number of steps was controlled by the thickness of SiO 2 layer. The surface morphology of β-si 3 N 4 was affected by the kind of nitrogen species. When only (N+N*) were used for nitridation in the condition of flux 0.02ML/s, it was found that several island structures which were detached from upper terrace were formed. The island size of β-si 3 N 4 became bigger without detachment from upper terrace when N 2 * were used. MBE, RF-discharge, Nitridation, β-si 3 N 4, AlN, β ( Research center for interface phenomena Recip) GaN AlN InN (molecular beam epitaxy : MBE) MBE 1 ) ) 2008 Si β-si3n4 Si β-si3n4 Al *Department of Electrical Engineering, Doshisha University, Kyoto Telephone: , FAX: , tohachi@eml.doshisha.ac.jp
2 AlN 3 ) Si Si Si GaN Si MBE Fig. Fig. Fig. 2 ) Fig. Fig. 1. Schematic of N*+N flux exposure directly (a) and indirectly by leaked flux (b) or reflected from a wall(c). Fig. Fig. 2. Schematic of self ionization from N*+N at negatively biased electrode: only N*+N a were detected at the electrode if N + 2 were eliminated.
3 IRF-501IF Mass flow RF K Fig. (a) Probe I-V characteristic for the electrode1. (b) Probe I-V characteristic for the electrode 2. Fig. 3. Atom electrodes 1 and 2 exposed indirect nitrogen atoms N+N* reflected from a wall. Fig. 3 6cmx12cm 2cm 1.38sccm 70Pa 500W HB I-V 4(a) 4(b) 4(c) (a) (b) +1000V -1000V Fig. 1000V (c) Enlarged I-V characteristics for the electrode 1, 2 and double 1 and 2 electrodes. Fig. 4. Langumuir probe characteristic for atom current measurement. Fig. 5. Eliminator potential dependence for atom currents at 108V ( 9V x 12).
4 80W LB + N 2 + e - Fig. 4 Fig. 5 N+N* N 2 + LB 5sccm 100W 300W Fig. 6 N W 100/20x10-9 =5 G 300W 100/60x10-9 =1.67 G GaN GaN Fig Fig. 6. I-V characteristics between 1 and 2 electrodes in Fig. 3 under LB discharges by 100W and 300W with 5sccm. Fig. 7. Growth rate of GaN as a function of Atom current. GaN N+N* VG80H 5.5x10-4 ML/s/nA ML Si 3 Si Si Si(111) Si(001) Si(111) Si Si(111) 1x1 T c 827 4), 830 5), 856 6), 860 7), 867 8), 868 9), ) 6) T c 856 (7x7)-(1x1) ML ,2ML (1ML=7.8x10 14 cm -2 ) )
5 7x7 1x1 1x ML, 0.14 ML, ML 12 Si(001) Si Si(001) 2 1 1x2 Si(111) 12 3) Si Al AlN AlN AlGaN GaN Si 13 Si 14) 90 HNO 3 HF 90 HNO 3 HF NH 4 OH:H 2 O 2 :H 2 O (1:1:4) HF HCl:H 2 O 2 :H 2 O (1:1:4) nm SiO ) 10-6Pa MBE 1x1 856 SiO 2 Si SiO 2 Si Si+SiO 2 2SiO Fig. 8 Fig. 8(a) Si(111) 7x7 Si AFM Si SiO 2 a 500nm 9.41 [nm] nm 1.00 x 1.00 µm c 3.39 [nm] nm 1.00 x 1.00 µm Fig. 8(b) sec 880 Si AFM 5nm Fig.8(c) HCl:H 2 O 2 :H 2 O (1:1:4) (d) HNO 3 SiO 2 Si AFM HCl (<5nm) HNO 3 Si/SiO 2 Si/SiO 2 b [nm] nm 1.00 x 1.00 µm d 2.53 [nm] nm 1.00 x 1.00 µm Fig. 8. AFM images of Si(111) surfaces after high temperature SiO 2 desorption. (a) Surface voids formed by slow heating rate up to 850 below (7x7)-(1x1) transition temperature, (b) Semicoclean treatement (c) HCl oxidation, and (d) HNO 3 oxidation.
6 Si 7x7 β-si 3 N 4 8x8 Fig. 9 Si(111) Fig.9(c) 2nm Si NH 19 20) 3 NO 21) N 22) 2 N 232,24) N 25) MBE Si(111) Fig.1 RF PBN (Radio Frequency : RF) HB LB 2) HB N* N N 2 * N + 2 e - LB N 2 * N + 2 e - N + 2 HB (c) Fig. 9. Surface reaction of N atoms and Si surface. (a) RHEED pattern of 7x7 Si(111), (b) 8x8 RHEED pattern o fβ-si3n4, (c) Step pattern on a clean Si surface. The banching step hight measured as about 2 nm. Fig. 10. Uniform nitraidation of 3 in Si (111) wafer using indirect exposure of N+N* flux.
7 HB Si β-si 3 N 4 Fig. 10 AFM Si(111) LEED 6-8,28) S i(111) 7x7 (a) (b) (c) Fig. 11. Surface morphology of b-si 3 N 4 observed by AFM : (a) Nitridation under 7x7 surface reconstraction, ( b) RHEED 8x8 patter for (a). (C) nitridation under 1x1
8 1x1 Si(111) DAS 29) Fig.10(a) 7x7 β-si 3 N 4 AFM 7x7 RHEED (8x8 ) Fig. 11(b) Fig. 11(c) 1x1 AFM β-si 3 N 4 : pp.29 (2006) pp.29 (2007) (2009). 4) W. Telieps, and E. Bauer, Surf, Sci. 162, (1985). 5) N. Osakabe, Y. Yanishiro, K. Yagi and G. Honjo, Surf, Sci. 109, (1981). 6) C.-W. Hu, H. Hibino, T. Ogino, and I.S.T. Tsong, Surface Sci. 487, (2001) 7) N. Aizawa and Y. Homma, Surf, Sci. 340, (1995). 8) P. A. Bennet anf d M.W. Webb, Surf, Sci (1981). 9) K. Miki, Y. Morita, H. Tokumoto, T. Sato, M. Iwatsuki, M. Suzuki and T. Fukuda, Ultramicroscopy (1992) 10) C. L. Wu, J. C. Wang, M. H. Chan, T. T. Chen, and S, Gwo, Appl. Phys. Lett. 83, 4530 (2003). 11 Y. Fukuya and Y. Sugita, Phys, Rev. Lett. 85, (2000). 12 M. Tabe and T. Yamamoto, Surf. Scie. 376, (1997). 13) Y. Homma, N. Aizaw and T. Ogino, Jpn. J. Appl.Pyhs. 35 L (1996). 14) A. Ishizaka, Y. Shiraki, J. Electron. Soc., 133, 666(1986). 15) Asuha, S. Imai, M. Takahashi and H. Kobayashi, Appl. Phys. Lett (2004). 16)) Asuha, S.S. Im, M. Tanaka, S. Imai, M. Takahashi, and H. Kobayashi Surf. Sci (2006). 17) W.B. Kim, Asuha, T. Matsumoto and H. Kobayashi, Appl. Phys. Lett. 93, (2008). 18) S. Imai, S. Mizuhima, Asuha, W.B. Kim, and H. Kobayashi, Appl. Surf. Sci (2008). 19) S. Vezian, A. Le Louarn, J. Massies, J. Crystal. Growth. 303, 419 (2007). 20) E. Bauer, Y. Wei, T. Müller, A. Pavlovska, I. S. T. Tsong, Phys. Rev. B 51, (1995). 21) M. Nishijima, H. Kobayashi, K. Edamoto, M. Onchi, Surf. Sci. 137, (1984) ) Y. Morita and H. Tokumoto, Surf. Sci. 443, (1999) L ) A. G. Schrott and S. C. Fain Jr., Surf. Sci. 111, (1981) ) J. S. Ha, K.-H. Park, W. S. Yun, E.-H. Lee, and S.-J. Park, Appl. Phys. A 66, S495 (1998). 25) S. Gangopadhyay, T. Schmit and J. Falta, e-j. Surf. Sci. Nanotech. 4, (2006) 26) K. Esamoto, S. Tanaka, M. Onchi, and M. Nishijima, Sur. Sci. 167, (1986). 27) H.C. Wang, R.F.Lin, X. Wang, Sur. Sci. 188, (1987). 28) M. Hoshino, Y. Shigeta, K. Ogawa and Y. Homma, 365, (1996). 29) K. Takayanagi, Y. Tanishiro, M. Takahashi, and S. Takahashi, J. Vac. Sci. Technol. A3, 1502 (1985).
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