Determination of the interface parameter in terahertz quantum-cascade laser structures based on transmission electron microscopy

被引：17
|
作者：
Lue, X. [1 ]
Luna, E. [1 ]
Schrottke, L. [1 ]
Biermann, K. [1 ]
Grahn, H. T. [1 ]
机构：
[1] Forsch Verbund Berlin eV, Leibniz Inst, Paul Drude Inst Festkorperelekt, Hausvogteipl 5-7, D-10117 Berlin, Germany
来源：
APPLIED PHYSICS LETTERS | 2018年 / 113卷 / 17期
关键词：
CONTINUOUS-WAVE OPERATION; ROOM-TEMPERATURE; SCATTERING;
D O I：
10.1063/1.5042326
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have determined the interface profiles of GaAs/Al0.25Ga0.75As and GaAs/AlAs terahertz quantum-cascade laser structures using transmission electron microscopy (TEM). The experimental composition profiles are directly extracted from the analysis of the diffracted intensity distribution of g(002) dark-field TEM images. Simulated composition profiles, which have been obtained using a Fourier-transform-based model, are in remarkably good agreement with the experimental results so that the determined interface parameter can be used for designing terahertz quantum-cascade lasers. Due to the interface grading, these actual profiles reveal a significantly lower aluminum content of the Al0.25Ga0.75As and AlAs barriers than the nominal values. Published by AIP Publishing.
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页数：5
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