Non-equilibrium Green's function calculation of AlGaAs-well-based and GaSb-based terahertz quantum cascade laser structures

被引：10

作者：

Yasuda, H. ^{[1
]}

Hosako, I. ^{[1
]}

机构：

[1] Natl Inst Informat & Commun Technol, Koganei, Tokyo 1848795, Japan

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 11期

关键词：

GA1-XALXAS ALLOYS; SEMICONDUCTOR; SCATTERING;

D O I：

10.1063/1.4916235

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate the performance of terahertz quantum cascade lasers (THz-QCLs) based on AlxGa1-xAs/AlyGa1-yAs and GaSb/AlGaSb material systems to realize higher-temperature operation. Calculations with the non-equilibrium Green's function method reveal that the AlGaAs-well-based THz-QCLs do not show improved performance, mainly because of alloy scattering in the ternary compound semiconductor. The GaSb-based THz-QCLs offer clear advantages over GaAs-based THz-QCLs. Weaker longitudinal optical phonon-electron interaction in GaSb produces higher peaks in the spectral functions of the lasing levels, which enables more electrons to be accumulated in the upper lasing level. (C) 2015 AIP Publishing LLC.

引用

页数：4

共 24 条

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