中国物理B ›› 2015, Vol. 24 ›› Issue (12): 127306-127306.doi: 10.1088/1674-1056/24/12/127306
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
张鹏a, 赵胜雷b, 薛军帅b, 祝杰杰a, 马晓华a, 张进成b, 郝跃b
Zhang Peng (张鹏)a, Zhao Sheng-Lei (赵胜雷)b, Xue Jun-Shuai (薛军帅)b, Zhu Jie-Jie (祝杰杰)a, Ma Xiao-Hua (马晓华)a, Zhang Jin-Cheng (张进成)b, Hao Yue (郝跃)b
摘要: In this paper the trapping effects in Al2O3/In0.17Al0.83N/GaN MOS-HEMT (here, HEMT stands for high electron mobility transistor) are investigated by frequency-dependent capacitance and conductance analysis. The trap states are found at both the Al2O3/InAlN and InAlN/GaN interface. Trap states in InAlN/GaN heterostructure are determined to have mixed de-trapping mechanisms, emission, and tunneling. Part of the electrons captured in the trap states are likely to tunnel into the two-dimensional electron gas (2DEG) channel under serious band bending and stronger electric field peak caused by high Al content in the InAlN barrier, which explains the opposite voltage dependence of time constant and relation between the time constant and energy of the trap states.
中图分类号: (III-V semiconductors)