新型双异质结高电子迁移率晶体管的电流崩塌效应研究

余晨辉; 罗向东; 周文政; 罗庆洲; 刘培生

南通大学江苏省专用集成电路设计重点实验室,南通,226019

广西大学物理科学与工程技术学院,南宁,530004

南京信息工程大学遥感学院,南京,210044

Investigation on the current collapse effect of AIGaN/GaN/InGaN/GaN double- heterojunction HEMTs

摘要: 针对传统单结GaN基高电子迁移率晶体管器件性能受电流崩塌效应和自加热效应限制的困境，对新型A1GaN／GaN／InGaN／GaN双异质结高电子迁移率晶体管的直流性质展开了系统研究．采用基于热电子效应和自加热效应的流体动力模型，研究了器件在不同偏压下电流崩塌和负微分电导效应与GaN沟道层厚度的相关．研究发现具有高势垒双异质的沟道层能更好地将电子限制在沟道中，显著减小高电场下热电子从沟道层向GaN缓冲层的穿透能力．提高GaN沟道层厚度可以有效抑制电流崩塌和和负微分输出电导，进而提高器件在高场作用下的性能．所得结果为进一步优化双异质结高电子迁移率晶体管结构提供了新思路，可促进新型GaN高电子迁移率晶体管器件在高功率、高频和高温等无线通讯领域内的广泛应用．

关键词:

Abstract: A series of A1GaN/GaN/InGaN/GaN double-heterojunction high-electron-mobility-transistors (DH-HEMT) is fabricated with GaN channel layer thicknesses from 6 nm to 20 nm by two-dimensional (2D) numerical simulations. A new idea for optimizating of DH-HEMT structure is proposed. The hot electron effect and self-heating effect are investigated by using hydrodynamic model. Current collapse and negative differential conductance are observed to be directly relevant to GaN channel layer thickness. DH-HEMT with thicker GaN channel layer can confine electrons better in channel, which significantly diminishes the penetration ability of hot electrons from channel layer to buffer layer under high voltage. Increasing the thickness of GaN channel layer appropriately can effectively restrict current collapse and negative differential conductance, and consequently improve device performance under high voltage condition.

新型双异质结高电子迁移率晶体管的电流崩塌效应研究

南通大学江苏省专用集成电路设计重点实验室,南通,226019

广西大学物理科学与工程技术学院,南宁,530004

南京信息工程大学遥感学院,南京,210044

关键词:

Investigation on the current collapse effect of AIGaN/GaN/InGaN/GaN double- heterojunction HEMTs

南通大学江苏省专用集成电路设计重点实验室,南通,226019

广西大学物理科学与工程技术学院,南宁,530004

南京信息工程大学遥感学院,南京,210044

Keywords:

全文HTML

参考文献 (0)