1. T. Taguchi, Proc. SPIE 7422, 74220B (2009)
2. H.K. Cho, J.Y. Lee, J.H. Song, P.W. Yu, G.M. Yang, C.S. Kim, J. Appl. Phys. 91, 1104 (2002)
3. Z.L. Fang, D.Q. Lin, J.Y. Kang, J.F. Kong, W.Z. Shen, Nanotechnology 20, 235401 (2009)
4. H. Morkoç, Handbook of Nitride Semiconductors and Devices, vol. 1 (Wiley-VCH, Berlin, 2008), Chap. 2
5. C.F. Huang, T.Y. Tang, J.J. Huang, W.Y. Shiao, C.C. Yang, C.W. Hsu, L.C. Chen, Appl. Phys. Lett. 89, 051913 (2006)