Effect of Multilayer Ti/Al Electrode Structure on AlGaN/GaN HEMT Ohmic Contact Characteristics

YU Ning; WANG Hong-hang; LIU Fei-fei; DU Zhi-juan; WANG Yue-hua; SONG Hui-hui; ZHU Yan-xu; SUN Jie

doi:10.3788/fgxb20163702.0219

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Effect of Multilayer Ti/Al Electrode Structure on AlGaN/GaN HEMT Ohmic Contact Characteristics

更新时间：2020-08-12

- Effect of Multilayer Ti/Al Electrode Structure on AlGaN/GaN HEMT Ohmic Contact Characteristics
- Chinese Journal of Luminescence Vol. 37, Issue 2, Pages: 219-223(2016)
- 作者机构：
  
  1. 北京工业大学电控学院光电子技术实验室北京,100124
  2. 电子科技大学中山学院电子薄膜与集成器件国家重点实验室中山分实验室,广东中山,528402
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20163702.0219
  CLC： TN386.3
- Received：26 October 2015，
  
  Revised：14 November 2015，
  
  Published：10 February 2016
- 稿件说明：
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于宁, 王红航, 刘飞飞等. 多层Ti/Al电极结构对GaN/AlGaN HEMT欧姆接触特性的影响[J]. 发光学报, 2016,37(2): 219-223

YU Ning, WANG Hong-hang, LIU Fei-fei etc. Effect of Multilayer Ti/Al Electrode Structure on AlGaN/GaN HEMT Ohmic Contact Characteristics[J]. Chinese Journal of Luminescence, 2016,37(2): 219-223
于宁, 王红航, 刘飞飞等. 多层Ti/Al电极结构对GaN/AlGaN HEMT欧姆接触特性的影响[J]. 发光学报, 2016,37(2): 219-223 DOI： 10.3788/fgxb20163702.0219.

YU Ning, WANG Hong-hang, LIU Fei-fei etc. Effect of Multilayer Ti/Al Electrode Structure on AlGaN/GaN HEMT Ohmic Contact Characteristics[J]. Chinese Journal of Luminescence, 2016,37(2): 219-223 DOI： 10.3788/fgxb20163702.0219.

摘要

研究了多层Ti/Al结构电极对GaN/AlGaN HEMT欧姆接触特性及表面形态的影响。采用传输线模型对各结构电极的比接触电阻率进行了测量

采用扫描电子显微镜对电极表面形态进行扫描。实验结果显示

在同样的退火条件下

随着Ti/Al层数的增加

比接触电阻率逐渐减小

表面形态趋于光滑;降低Ti/Al层的厚度会加剧Au向内扩散而增加比接触电阻率

但能稍微改善表面形态;Ti比例过高会影响TiN的形成导致比接触电阻率增加

但能明显改善表面形态。

Abstract

The effect of multilayer Ti/Al structure electrode on AlGaN/GaN HEMT Ohmic contact characteristics and the surface morphology were investigated. The specific contact resistance of all kinds of electrode structure was measured by transmission line model (TLM). The scanning electron microscope (SEM) was used to measure the electrode surface morphology. The experiment results show that the special contact resistance tend to decrease and the surface morphology tend to be smooth with the increasing of the number of Ti/Al layers in the same annealing conditions. The reducing of the thickness of Ti/Al layer can increase the specific contact resistance because of Au in-diffusion

but can slightly improve the surface morphology. High Ti ratio can reduce the formation of TiN

and lead to the increasing of specific contact resistance

but can greatly improve the surface morphology.

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Keywords

references

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