Effects of Step-graded AlxGa1-xN Buffer on Properties of GaN Films

LI Bao-zhu; HUANG Zhen; DENG Gao-qiang; DONG Xin; ZHANG Yuan-tao; ZHANG Bao-lin; Du Guo-to

doi:10.3788/fgxb20173806.0780

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Effects of Step-graded Al_xGa_{1-xN Buffer on Properties of GaN Films}

更新时间：2020-08-12

- Effects of Step-graded Al_xGa_{1-xN Buffer on Properties of GaN Films}
- Chinese Journal of Luminescence Vol. 38, Issue 6, Pages: 780-785(2017)
- 作者机构：
  
  集成光电子国家重点联合实验室吉林大学电子科学与工程学院,吉林长春,130012
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20173806.0780
  CLC： TP394.1;TN484.4
- Received：30 December 2016，
  
  Revised：22 February 2017，
  
  Published：05 June 2017
- 稿件说明：
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李宝珠, 黄振, 邓高强等. 梯度铝镓氮缓冲层对氮化镓外延层性质的影响[J]. 发光学报, 2017,38(6): 780-785

LI Bao-zhu, HUANG Zhen, DENG Gao-qiang etc. Effects of Step-graded AlxGa1-xN Buffer on Properties of GaN Films[J]. Chinese Journal of Luminescence, 2017,38(6): 780-785
李宝珠, 黄振, 邓高强等. 梯度铝镓氮缓冲层对氮化镓外延层性质的影响[J]. 发光学报, 2017,38(6): 780-785 DOI： 10.3788/fgxb20173806.0780.

LI Bao-zhu, HUANG Zhen, DENG Gao-qiang etc. Effects of Step-graded AlxGa1-xN Buffer on Properties of GaN Films[J]. Chinese Journal of Luminescence, 2017,38(6): 780-785 DOI： 10.3788/fgxb20173806.0780.

摘要

采用金属有机物化学气相沉积系统在硅面碳化硅衬底的（0001）面上生长氮化铝缓冲层，并通过改变3层梯度铝镓氮（Al

N：

=0.8，0.5，0.2）缓冲层的生长温度和氨气流量，制备出了高质量的氮化镓外延层。分别采用X射线衍射、原子力显微镜、光致发光谱和拉曼光谱对氮化镓外延层进行表征。实验结果表明，随着氮化镓外延层中张应力的降低，样品的晶体质量、表面形貌和光学质量都有显著提高。在最优的梯度铝镓氮缓冲层的生长条件下，氮化镓外延层中的应力值最小，氮化镓（0002）和（1012）面的摇摆曲线半峰宽分别为191 arcsec和243 arcsec，薄膜螺位错密度和刃位错密度分别为710

-2

和3.110

-2

，样品表面粗糙度为0.381 nm。这说明梯度铝镓氮缓冲层可以改变氮化镓外延层的应力状态，显著提高氮化镓外延层的晶体质量。

Abstract

High-quality GaN films were grown on Si-plane 6H-SiC (0001) substrates with AlN buffer and step-graded AlGaN (Al

=0.8

0.5

0.2) buffer with different growth temperature and NH

flux by metal-organic chemical vapor deposition (MOCVD). The properties of GaN films were examined by X-ray diffraction

atomic force microscopy

room temperature photoluminescence spectra and Raman spectra. Experimental results show that the lower tensile stress in the GaN films

the higher the crystallinity

surface morphologies and optical properties of the GaN films. Under the optimum conditions of AlGaN buffer

the stress value of GaN films is reduced to its minimum. The

-rocking curves full-width at half-maximum (FWHM) of the (0002) and (1012) planes are ameliorated to 191 and 243 arcsec

respectively. The densities of screw and edge dislocations decrease to the best values of 710

and 3.110

-2

. The root-mean-squared roughness value is 0.381 nm. It shows that the step-graded AlGaN buffer can change stress state in GaN films effectively and improve the crystallinity of GaN films significantly.

关键词

Keywords

references

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