中国物理B ›› 2015, Vol. 24 ›› Issue (9): 96802-096802.doi: 10.1088/1674-1056/24/9/096802

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Growth condition optimization and mobility enhancement throughprolonging the GaN nuclei coalescence process of AlGaN/AlN/GaN structure

何晓光a, 赵德刚a, 江德生a, 朱建军a, 陈平a, 刘宗顺a, 乐伶聪a, 杨静a, 李晓静a, 张书明b, 杨辉b   

  1. a State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    b Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215125, China
  • 收稿日期:2014-12-05 修回日期:2015-03-31 出版日期:2015-09-05 发布日期:2015-09-05
  • 基金资助:

    Project support by the National Natural Science Foundation of China (Grant Nos. 61474110, 61377020, 61376089, 61223005, and 61176126), the National Science Fund for Distinguished Young Scholars, China (Grant No. 60925017), the One Hundred Person Project of the Chinese Academy of Sciences, and the Basic Research Project of Jiangsu Province, China (Grant No. BK20130362).

Growth condition optimization and mobility enhancement throughprolonging the GaN nuclei coalescence process of AlGaN/AlN/GaN structure

He Xiao-Guang (何晓光)a, Zhao De-Gang (赵德刚)a, Jiang De-Sheng (江德生)a, Zhu Jian-Jun (朱建军)a, Chen Ping (陈平)a, Liu Zong-Shun (刘宗顺)a, Le Ling-Cong (乐伶聪)a, Yang Jing (杨静)a, Li Xiao-Jing (李晓静)a, Zhang Shu-Ming (张书明)b, Yang Hui (杨辉)b   

  1. a State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    b Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215125, China
  • Received:2014-12-05 Revised:2015-03-31 Online:2015-09-05 Published:2015-09-05
  • Contact: Zhao De-Gang E-mail:dgzhao@red.semi.ac.cn
  • Supported by:

    Project support by the National Natural Science Foundation of China (Grant Nos. 61474110, 61377020, 61376089, 61223005, and 61176126), the National Science Fund for Distinguished Young Scholars, China (Grant No. 60925017), the One Hundred Person Project of the Chinese Academy of Sciences, and the Basic Research Project of Jiangsu Province, China (Grant No. BK20130362).

摘要:

AlGaN/AlN/GaN structures are grown by metalorganic vapor phase epitaxy on sapphire substrates. Influences of AlN interlayer thickness, AlGaN barrier thickness, and Al composition on the two-dimensional electron gas (2DEG) performance are investigated. Lowering the V/III ratio and enhancing the reactor pressure at the initial stage of the high-temperature GaN layer growth will prolong the GaN nuclei coalescence process and effectively improve the crystalline quality and the interface morphology, diminishing the interface roughness scattering and improving 2DEG mobility. AlGaN/AlN/GaN structure with 2DEG sheet density of 1.19× 1013 cm-2, electron mobility of 2101 cm2·V-1·s-1, and square resistance of 249 Ω is obtained.

关键词: high electron mobility transistor, two-dimensional electron gas, GaN

Abstract:

AlGaN/AlN/GaN structures are grown by metalorganic vapor phase epitaxy on sapphire substrates. Influences of AlN interlayer thickness, AlGaN barrier thickness, and Al composition on the two-dimensional electron gas (2DEG) performance are investigated. Lowering the V/III ratio and enhancing the reactor pressure at the initial stage of the high-temperature GaN layer growth will prolong the GaN nuclei coalescence process and effectively improve the crystalline quality and the interface morphology, diminishing the interface roughness scattering and improving 2DEG mobility. AlGaN/AlN/GaN structure with 2DEG sheet density of 1.19× 1013 cm-2, electron mobility of 2101 cm2·V-1·s-1, and square resistance of 249 Ω is obtained.

Key words: high electron mobility transistor, two-dimensional electron gas, GaN

中图分类号:  (Semiconductors)

  • 68.35.bg
68.35.Ct (Interface structure and roughness) 72.10.-d (Theory of electronic transport; scattering mechanisms)