A new structure for reducing the channel temperature of GaN HEMT

LI Jia; CHEN Wan-jun; SUN Rui-ze; XIN Ya-jie

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A new structure for reducing the channel temperature of GaN HEMT

更新时间：2026-09-04

- A new structure for reducing the channel temperature of GaN HEMT
- Vol. 37, Issue 8, Pages: 27-31(2020)
- 作者机构：
  
  电子科技大学电子科学与工程学院,四川,成都,610054
- 作者简介：
- 基金信息：
- DOI：
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- Published：2020
- 稿件说明：
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李佳, 陈万军, 孙瑞泽, 信亚杰. 一种降低GaN HEMT沟道温度的新结构[J]. 微电子学与计算机, 2020, 37(8): 27-31.

LI Jia, CHEN Wan-jun, SUN Rui-ze, et al. A new structure for reducing the channel temperature of GaN HEMT[J]. 2020, 37(8): 27-31.
李佳, 陈万军, 孙瑞泽, 信亚杰. 一种降低GaN HEMT沟道温度的新结构[J]. 微电子学与计算机, 2020, 37(8): 27-31. DOI：

LI Jia, CHEN Wan-jun, SUN Rui-ze, et al. A new structure for reducing the channel temperature of GaN HEMT[J]. 2020, 37(8): 27-31. DOI：

摘要

针对氮化镓高电子迁移率晶体管(GaN HEMT)沟道温度过高导致器件性能下降的问题，提出一种降低GaN HEMT沟道温度的新结构，通过优化沟道电场来降低沟道温度.该结构采用混合势垒层设计，将栅极下方的势垒层分为两层，上层采用AlN，下层采用重掺杂的AlGaN；此外，该结构还使用场板；为了更好的散热，该结构采用热导率更高的AlN代替传统的SiN作为器件的钝化层.场板和混合势垒层有利于改善沟道电场，降低器件沟道温度.仿真结果表明，相比于传统结构，新结构的沟道温度分布更加均匀，温度峰值下降47 K.此外，新结构的击穿电压提高50%，输出特性也得到了改善.

Abstract

When the channel temperature of GaN high electron mobility transistor (GaN HEMT) is too high

the performance of the device is degraded. To solve this problem

a new structure is proposed

the channel temperature is reduced by optimizing the electric field. The barrier layer under the new structure gate is called the mixed barrier layer

which consists of two layers

the upper layer is AlN and the lower layer is heavily doped AlGaN. In addition

the field plate is also introduced to change the channel electric field. For better heat dissipation

the passivation layer material of the new structure is AlN instead of SiN

because it has a higher thermal conductivity. Compared with the traditional structure

the channel temperature distribution of the new structure is more uniform

and the channel temperature peak drops by 47K. In addition

the breakdown voltage of the new structure is increased by 50%

and the output characteristics are also improved.

关键词

Keywords

references

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