Determination of the relative permittivity of the AlGaN barrier layer in strained AlGaN/GaN heterostructures
Zhao Jian-Zhi(赵建芝)a), Lin Zhao-Jun(林兆军)a)†, Timothy D Corriganb), Zhang Yu(张宇)a), Lü Yuan-Jie(吕元杰)a), Lu Wu(鲁武)c), Wang Zhan-Guo(王占国)d), and Chen Hong(陈弘)e)
a School of Physics, Shandong University, Jinan 250100, China; b Department of Physics, University of Maryland, College Park, MD 20740, USA; c Department of Electrical Engineering, The Ohio State University, Columbus, Ohio 43210, USA; d Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China ; e Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Abstract Using the measured capacitance--voltage curves and the photocurrent spectrum obtained from the Ni Schottky contact on a strained Al0.3Ga0.7N/GaN heterostructure, the value of the relative permittivity of the AlGaN barrier layer was analysed and calculated by self-consistently solving Schr?dinger's and Poisson's equations. It is shown that the calculated values of the relative permittivity are different from those formerly reported, and reverse biasing the Ni Schottky contact has an influence on the value of the relative permittivity. As the reverse bias increases from 0 V to --3 V, the value of the relative permittivity decreases from 7.184 to 7.093.
Received: 21 December 2008
Revised: 11 April 2009
Accepted manuscript online:
(III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)
Fund: Project
supported by the National Natural Science Foundation of China (Grant
No 10774090) and the National Basic Research Program of
China (Grant No 2007CB936602).
Cite this article:
Zhao Jian-Zhi(赵建芝), Lin Zhao-Jun(林兆军), Timothy D Corrigan, Zhang Yu(张宇), Lü Yuan-Jie(吕元杰), Lu Wu(鲁武), Wang Zhan-Guo(王占国), and Chen Hong(陈弘) Determination of the relative permittivity of the AlGaN barrier layer in strained AlGaN/GaN heterostructures 2009 Chin. Phys. B 18 3980
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
