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¡° It would take until 1986 before GaN with high crystal quality and good optical properties could be produced with the MOVPE technique [26]. The breakthrough was the result of a long series of experiments and observations.¡±
¡°Shuji Nakamura at Nichia Chemical Corporation, a small chemical company in Japan, later developed a similar method where AlN was replaced with a thin layer of GaN grown at low temperature [28].¡±

26. H. Amano, N. Sawaki, I. Akasaki & Y. Toyoda, Appl. Phys. Lett. 48, 353 (1986).
28. S. Nakamura, Jpn. J. Appl. Phys. 30, L1705 (1991); S. Nakamura, M. Senoh, & T. Mukai, Jpn. J. Appl. Phys. 30, L1998 (1991).
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¡° ¡­.[26], The breakthrough was the result of a long series of experiments and observations. A thin layer (30 nm) of polycrystalline AlN was first nucleated on a substrate of sapphire at low temperature (500 ¡ãC) and then heated up to the growth temperature of GaN (1000 ¡ãC) . During the heating process, the layer develops a texture of small crystallites with a preferred orientation on which GaN can be grown. The density of dislocations of the growing GaN crystal is first high, but decreases rapidly after a few m growth. A high quality surface could be obtained, which was very important to grow thin multilayer structures in the following steps of the LED development. In this way, high quality device-grade GaN was obtained for the first time (see Fig. 2a [27]) .Shuji Nakamura at Nichia Chemical Corporation, a small chemical company in Japan, later developed a similar method where AlN was replaced with a thin layer of GaN grown at low temperature [28].¡±
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27. K. Hiramatsu et al., J. Crystal Growth 115, 628 (1991).
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