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Improvement of the quality of GaN epilayer by combining a SiNx interlayer and changed GaN growth mode
Authors:Dechao Yang  Hongwei Liang  Yu Qiu  Shiwei Song  Yang Liu  Rensheng Shen  Yingmin Luo  Guotong Du
Affiliation:1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130023, China
2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, China
3. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai, 200050, China
Abstract:GaN epilayers with porous SiNx interlayer and changed growth modes were grown by metal–organic chemical vapor deposition on c-plane sapphire substrates. Comparing with GaN epilayer grown by ordinary method, the crystalline qualities were significantly improved. The improvement was attributed to the reduction of the density of threading dislocations causing by over-growth process combining with delayed coalescence of individual GaN islands. The influence of the deposition and annealing of nucleation layer on the GaN regrowth was also discussed.
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