论文研究-A method for the solution of the electrostatic properties o...
需积分: 0 119 浏览量
2019-08-14
17:18:44
上传
评论
收藏 207KB PDF 举报
http://www.paper.edu.cn
- 1 -
中国科技论文在线
A method for the solution of the electrostatic properties of
metal-(n)AlGaN-GaN two dimensional electron gas
#
ZHANG Jinfeng, HAO Yue
(School of Microelectronics, Xidian University, Xi'an 710071) 5
Foundations: New Teacher Foundation for Doctoral Program of Ministry of Education of China (Grant No.
200807011012)
Brief author introduction：ZHANG Jinfeng, (1977-), female, associate professor, and her main research interests
focus on the GaN-based electronic materials and devices and（Al)GaN short wavelength laser materials and
devices. E-mail: jfzhang@xidian.edu.cn
Abstract: To help explore the electrostatic properties of AlGaN-GaN two dimensional electron gas
(2DEG), we present a simple and efficient method to determine the fermi level EF and solve 2DEG
distribution and conduction band edge simultaneously, whose essence is to fix EF by two 2DEG sheet
density vs. EF relations respectively deduced from Schrödinger and Poisson equations. This method is
applicable to the situation that depletion approximation holds and background doping charge can be
10
omitted, and the polarization effects of nitrides can be combined.
Keywords: AlGaN-GaN heterostructures; two dimensional electron gas; fermi level; sheet density
0 Introduction
Though AlGaN-GaN Modulation doped Field Transistors (MODFET’s) have been 15
intensively investigated, whose basic structure, i.e., AlGaN-GaN heterostructures have many
puzzling properties. The performance of such microwave power devices are determined by sheet
density Ns and mobilityμof the Two Dimensional Gas (2DEG) naturally formed in AlGaN-GaN
heterostructures, and some self-consistent one dimensional Schrödinger-Poisson solvers have been
developed to explore 2DEG charge control theory at quasi-static state [1][2][3]. However, about 20
how to determine an important quantity, i.e., the fermi level E
F
, almost nothing is mentioned. A
quite simple and efficient method to determine E
F
and calculate 2DEG distribution n
2D
(z) and
conduction band edge Ec(z) simultaneously is presented.
1 Basic principles and our method
1.1 Basic charge control theory and the problems 25
2DEG is an effect that electrons accumulated in quantum well of conduction band edge at the
interfaces between AlGaN and GaN, and its charge control theory can be formulated by equations
below [1][2][3]. The quantities appeared are defined in Table 1 for concise description.
Within effective mass approximation, Schrödinger equation has been put as
[]
0)()(
2
)(
2
*
2
2
=−+ zzEcE
m
z
dz
d
iii
ψψ
=
, (1) 30
where Ec(z) satisfies
)()()( zEczqVzEc
Δ
+
−=
. Electron density each subband is then
obtained by
⎥
⎦
⎤
⎢
⎣
⎡
−
+=
+
=
∫
∞
−
)exp(1ln
1
1
2
*
/)(2
*
Tk
EETkm
dE
e
m
n
B
iF
B
E
TkEE
i
i
BF
==
ππ
.
So Ns and 2DEG distribution n
2D
(z) satisfy respectively
∑
=
i
i
nNs
, (2) 35
∑
=
i
iiiD
zznzn )()()(
*
2
ψψ
, (3)
资源评论
普通网友
- 粉丝: 484
- 资源: 1万+
最新资源
- Python闭包：深入理解与应用场景解析.zip
- Win64OpenSSL-3-3-0.exe
- 课高分程设计-基于C++实现的民航飞行与地图简易管理系统-南京航空航天大学
- 航天器遥测数据故障检测系统python源码+文档说明+数据库(课程设计)
- 北京航空航天大学操作系统课设+ppt+实验报告
- 基于Vue+Echarts实现风力发电机中传感器的数据展示监控可视化系统+源代码+文档说明(高分课程设计)
- 基于单片机的风力发电机转速控制源码
- 基于C++实现的风力发电气动平衡监测系统+源代码+测量数据(高分课程设计)
- 毕业设计- 基于STM32F103C8T6 单片机，物联网技术的太阳能发电装置+源代码+文档说明+架构图+界面截图
- 基于 LSTM（长短期记忆）（即改进的循环神经网络）预测风力发电厂中风力涡轮机产生的功率+源代码+文档说明
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
