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arXiv 2012.13369physics.app-phphysics.optics
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硅光子学应用中GaInSb量子阱激光器的热性能

Thermal performance of GaInSb quantum well lasers for silicon photonics applications

Christopher R. Fitch, Graham W. Read, Igor P. Marko, Dominic A. Duffy, Laurent Cerutti, Jean-Baptiste Rodriguez, Eric Tournié, Stephen J. Sweeney

摘要:

实现硅光子学的关键部件是在接近1.55 $μ$ m的重要通信波段中工作的集成激光器。一种方法是通过使用可以直接在硅上生长的基于GaSb的合金。在这项研究中,硅兼容应变镓$_{0.8}$在$_{0.2}$锑/铝$_{0.35}$镓$_{0.65}$作为$_{0.03}$锑$_{0.97}$复合量子阱(CQW)激光器生长在GaSb衬底上发射在1.55 $μ$米已开发和研究其热性能。变温和高压技术被用来研究器件设计对性能的影响。这些测量结果表明,器件的温度依赖性主要由载流子泄漏到Al $_{0.35}$ Ga $_{0.65}$ As $_{0.03}$ Sb $_{0.97}$势垒层的X最小值占室温下阈值电流的43%。通过改进CQW设计可以改善器件性能,而通过优化阻挡层成分可以改善载流子限制。这项研究提供了有价值的设计见解,单片集成的砷化镓基激光器在硅上。

英文摘要:

A key component for the realization of silicon-photonics are integrated lasers operating in the important communications band near 1.55 $μ$m. One approach is through the use of GaSb-based alloys which may be grown directly on silicon. In this study, silicon-compatible strained Ga$_{0.8}$In$_{0.2}$Sb/Al$_{0.35}$Ga$_{0.65}$As$_{0.03}$Sb$_{0.97}$ composite quantum well (CQW) lasers grown on GaSb substrates emitting at 1.55 $μ$m have been developed and investigated in terms of their thermal performance. Variable temperature and high-pressure techniques were used to investigate the influence of device design on performance. These measurements show that the temperature dependence of the devices is dominated by carrier leakage to the X minima of the Al$_{0.35}$Ga$_{0.65}$As$_{0.03}$Sb$_{0.97}$ barrier layers accounting for up to 43% of the threshold current at room temperature. Improvement in device performance may be possible through refinements in the CQW design, while carrier confinement may be improved by optimization of the barrier layer composition. This investigation provides valuable design insights for the monolithic integration of GaSb-based lasers on silicon.

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