[1] [1] Bhattacharyya S R, Majumder S. Functional Materials Letters, 2010, 3 (2): 111.

[2] [2] Zhou J C, Li L, Rong L Y, et al. International Journal of Modern Physics B, 2011, 25(20): 2741.

[3] [3] Pearton S J, Lim W T, Wright J S, et al. Journal of Electronic Materials, 2008, 37(9): 1426.

[4] [4] Mahajan J R. International Journal of Modern Physics B, 2011, 25(31): 4294.

[8] [8] Yoshino K, Oyama S, Yoneta M. J Mater Sci: Mater Electron, 2008, 19: 203.

[9] [9] Vashaei Z, Minegishi T, Suzuk i H, et al. J. Appl. Phys., 2005, 98: 4911.

[10] [10] Cho J Y, Kim I K, Jung I O, et al. J. Electroceram, 2009, 23: 442.

[11] [11] Nakamura A, Yamamoto K, Ishihara J, et al. Jpn. J. Appl. Phys., 2005, 44: 7267.

[12] [12] Ji Z, Song Y, Xiang Y, et al. J. Cryst. Growth, 2004, 265: 537.

[13] [13] Huang Q L, Fang L, Ruan H B, et al. Surface Review and Letters, 2011, 18(5): 189.