Preparation of GaN-based cross-sectional TEM specimens by laser lift-off.
Laser lift-off (LLO) technology is successfully used to prepare GaN-based TEM cross-sectional specimens. Detailed procedures of the method to prepare the specimens are demonstrated. Large thin areas suitable for TEM analysis were obtained. TEM images of the resulting GaN interface are studied, and the changes in structural quality are confined to approximately the first 250 nm of the epilayer. Clear TEM images of the whole epilayer and the InGaN quantum wells and the HRTEM images of the superlattice layer are demonstrated, showing that LLO is a quick and ideal method to study the crystal structure of the epilayer, especially if only the upper layers are of interest.
Zilan
Li
L
State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China. zealan@water.pku.edu.cn
Xiaodong
Hu
H
Ke
Chen
C
Ruijuan
Nie
N
Xuhui
Luo
L
Xiaoping
Zhang
Z
Tongjun
Yu
Y
Bei
Zhang
Z
Song
Chen
C
Zhijian
Yang
Y
Zhizhong
Chen
C
Guoyi
Zhang
Z