Theoretical analysis of AlGaN/GaN resonant tunnelling diodes with step heterojunctions spacer and sub-quantum well

33rd International Conference on the Physics of Semiconductors

Liu, Y.^1 ; Gao, B.^1 ; Gong, M.^1

Key Laboratory for Microelectronics, College of Physical Science and Technology, Sichuan University, Chengdu Sichuan

610064, China^1

关键词: Analysis and simulation;    Device performance;    High frequency HF;    High power applications;    Negative differential resistance characteristics;    Negative differential resistances;    Peak current density;    Peak to valley current ratio;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/864/1/012022/pdf
DOI  :  10.1088/1742-6596/864/1/012022

来源: IOP

【 摘 要 】

In this paper, we proposed to use step heterojunctions emitter spacer (SHES) and InGaN sub-quantum well in AlGaN/GaN/AlGaN double barrier resonant tunnelling diodes (RTDs). Theoretical analysis of RTD with SHES and InGaN sub-quantum well was presented, which indicated that the negative differential resistance (NDR) characteristic was improved. And the simulation results, peak current density JP=82.67 mA/μm2, the peak-to-valley current ratio PVCR=3.38, and intrinsic negative differential resistance RN=-0.147Ω at room temperature, verified the improvement of NDR characteristic brought about by SHES and InGaN sub-quantum well. Both the theoretical analysis and simulation results showed that the device performance, especially the average oscillator output power presented great improvement and reached 2.77mW/μm2magnitude. And the resistive cut-off frequency would benefit a lot from the relatively small RNas well. Our works provide an important alternative to the current approaches in designing new structure GaN based RTD for practical high frequency and high power applications.