AlGaN日盲紫外雪崩光电探测器暗电流研究  

Research on dark current of AlGaN solar-blind ultraviolet avalanche photodetectors

作　　者：葛张峰 余晨辉[1] 陈鸣 李林 许金通[2] Ge Zhangfeng;Yu Chenhui;Chen Ming;Li Lin;Xu Jintong(Jiangsu Key Laboratory of ASIC Design,Nantong University,Nantong 226019,China;Key Laboratory of Infrared Imaging Materials and Detectors,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China)

机构地区：[1]南通大学江苏省专用集成电路设计重点实验室,江苏南通226019 [2]中国科学院上海技术物理研究所红外成像材料与器件重点实验室,上海200083

出　　处：《红外与激光工程》2018年第9期181-187,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金(11574166);国家留学基金(201708320105);江苏省高校自然科学研究重大项目(14KJA510005)

摘　　要：为了提高AlGaN日盲紫外雪崩探测器的信噪比,降低暗电流,研制高性能日盲紫外探测器,针对AlGaN日盲紫外雪崩探测器暗电流机制进行了深入研究。首先对传统p-i-n-i-n结构雪崩探测器进行了初步研究,分别设计了GaN和AlGaN的两种雪崩探测器模型,分析了其不同暗电流特性,得到的模拟暗电流特性曲线与实验吻合。在此基础上,针对日盲紫外波段高Al组分AlGaN雪崩探测器,重点分析研究了不同异质界面的负极化电荷、p型有效掺杂以及温度等因素对暗电流的影响。在AlGaN日盲紫外雪崩探测器研究中得到的近零偏工作暗电流为2.5×10-13A,在反向138V左右发生雪崩击穿,雪崩开启电流为18.3nA左右,击穿电压温度系数约为0.05V/K,与实验及文献测试结果吻合。In order to improve the S/N ratio,reduce the dark current and develop the solar-blind photodetectors with high performance,the dark currents of the AlGaN solar-blind ultraviolet avalanche photodetectors were studied.Firstly,the conventional p-i-n-i-n avalanche photodetectors were examined using two newly designed models of avalanche photodetectors in GaN and AlGaN.Different characteristics of dark current were analyzed and the simulation of the dark current matched the experimental data well.Based on this,the effects of the negative polarization charge at different heterogeneous interfaces,the p-type effective doping and temperature on the dark current in high Al content AlGaN solar-blind avalanche photodetectors were investigated in detail.Results show that the dark current of the AlGaN solar-blind ultraviolet avalanche photodetector is about 2.5×10-13 A near zero bias,the avalanche breakdown occurs at about 138 V in reverse and the open current is about 18.3 nA,temperature coefficient for the breakdown voltage is about 0.05 V/K,which are all consistent with the experiments and the literature results well.

关 键 词：ALGAN 日盲紫外雪崩探测器 暗电流 负极化效应 

分 类 号：TN23[电子电信—物理电子学]