An ultra-thin compliant sapphire membrane for the growth of less strained, less defective GaN

作者：Moon Daeyoung; Jang Jeonghwan; Choi Daehan; Shin In Su; Lee Donghyun; Bae Dukkyu; Park Yongjo^*; Yoon Euijoon^*

来源：Journal of Crystal Growth, 2016, 441: 52-57.

DOI：10.1016/j.jcrysgro.2016.02.001

• Defects
• Substrates
• Single crystal growth
• Metalorganic chemical vapor deposition
• Solid phase epitaxy
• Semiconducting III-V materials

An ultra-thin (26 nm) sapphire (Al2O3) membrane was used as a compliant substrate for the growth of high quality GaN. The density of misfit dislocations per unit length at the interface between the GaN layer and the sapphire membrane was reduced by 28% compared to GaN on the conventional sapphire substrate. Threading dislocation density in GaN on the sapphire membrane was measured to be 2.4 x 10(8)/cm(2), which is lower than that for GaN on the conventional sapphire substrate (3.2 x 10(8)/cm(2)). XRD and micro-Raman results verifed that the residual stress in GaN on the sapphire membrane was as low as 0.02 GPa due to stress absorption by the ultra-thin compliant sapphire membrane.

• 出版日期2016-5-1