[2] [2] Bakin V V, Pakhnevich A A, Zhuravlev A G. Journal of Surface Science and Nanotechnology, 2007, 5: 80.

[3] [3] Iwaya M, Takeuchi T, Yamaguchi S. Jpn. J. Appl. Phys., 1998, 37: L316.

[4] [4] Nakcmura S, Mukai T, Senoh M. Jpn. J. Appl. Phys., 1992, 31: L139.

[5] [5] ZOU Ji-jun, CHANG Ben-kang. Optical Engineering, 2006, 45(5): 054001-1.

[6] [6] Machuca F, Liu Zhi, Sun Yun. Journal of Vac. Sci. Technol. A, 2002, 20(5): 1784.

[7] [7] Tereshchenko O E, Shaǐbler G E, Yaroshevich A S. Physics of the Solid State, 2004, 46(10): 1949.

[8] [8] King S W, Barnak J P, Bremser M D. J. Appl. Phys., 1998, 84(9): 5248.

[10] [10] Zhi Yang, Benkang Chang, Jijun Zou. Applied Optics, 2007, 46(28): 7035.

[11] [11] Yijun Zhang, Benkang Chang, Zhi Yang. Applied Optics, 2009, 48(9): 1715.

[12] [12] Mnatsakanov T T, Levinshtein M E, Pomortseva L I. Solid-State Electronics, 2003, 47(2): 111.

[13] [13] Burt M G, Inkson J G. Journal of Physics D: Applied Physics, 1976, 9: 43.