中国物理B ›› 2011, Vol. 20 ›› Issue (1): 17203-017203.doi: 10.1088/1674-1056/20/1/017203
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毛维1, 郝跃1, 张进成1, 刘红侠1, 毕志伟1, 许晟瑞1, 薛军帅1, 马晓华1, 王冲1, 杨林安1, 张金风1, 匡贤伟1, 杨翠2
Mao Wei(毛维)a)† , Yang Cui(杨翠) b), Hao Yao(郝跃)a), Zhang Jin-Cheng(张进成)a), Liu Hong-Xia(刘红侠) a), Bi Zhi-Wei(毕志伟)a), Xu Sheng-Rui(许晟瑞)a), Xue Jun-Shuai(薛军帅)a), Ma Xiao-Hua(马晓华)a), Wang Chong(王冲)a), Yang Lin-An(杨林安)a), Zhang Jin-Feng(张金风)a), and Kuang Xian-Wei(匡贤伟)a)
摘要: We present an AlInN/AlN/GaN MOS–HEMT with a 3 nm ultra-thin atomic layer deposition (ALD) Al2O3 dielectric layer and a 0.3 μm field-plate (FP)-MOS--HEMT. Compared with a conventional AlInN/AlN/GaN HEMT (HEMT) with the same dimensions, a FP-MOS--HEMT with a 0.6 μm gate length exhibits an improved maximum drain current of 1141 mA/mm, an improved peak extrinsic transconductance of 325 mS/mm and effective suppression of gate leakage in both the reverse direction (by about one order of magnitude) and the forward direction (by more than two orders of magnitude). Moreover, the peak extrinsic transconductance of the FP-MOS--HEMT is slightly larger than that of the HEMT, indicating an exciting improvement of transconductance performance. The sharp transition from depletion to accumulation in the capacitance--voltage (C--V) curve of the FP-MOS--HEMT demonstrates a high-quality interface of Al2O3/AlInN. In addition, a large off-state breakdown voltage of 133 V, a high field-plate efficiency of 170 V/μ m and a negligible double-pulse current collapse is achieved in the FP-MOS--HEMT. This is attributed to the adoption of an ultra-thin Al2O3 gate dielectric and also of a field-plate on the dielectric of an appropriate thickness. The results show a great potential application of the ultra-thin ALD-Al2O3 FP-MOS--HEMT to deliver high currents and power densities in high power microwave technologies.
中图分类号: (III-V and II-VI semiconductors)