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在Si和GaAs上的InAs量子点激光器的逐渐降解
Eamonn T Hughes1, Chen Shang1, Jennifer Selvidge1,2
1Materials Department, University of California Santa Barbara, Santa Barbara, California, USA. jbowers@ucsb.edu.
Nanoscale
|January 22, 2024
概括
量子点激光在上因点缺陷而降解,而不仅仅是位移. 修改制造和生长条件可以提高集成光子学激光器的可靠性.
科学领域:
- 综合光子学 综合光子学
- 半导体激光器 半导体激光器
- 材料科学 是一种材料科学.
背景情况:
- 上的量子点 (QD) 激光器对于集成光子学至关重要.
- 基于的可靠QD激光器仍然是一个重大挑战.
- 了解降解机制是改善设备寿命的关键.
研究的目的:
- 为了研究QD激光在上的长期降解.
- 为了比较QD激光器的降解与不合适的脱位捕获层.
- 确定基QD激光器降解的主要原因.
主要方法:
- 在上老化QD激光器 (带有和没有捕获层) 12000小时.
- 在原生GaAs上老化QD激光器8400小时作为参考.
- 使用电光成像和电子显微镜来分析老化的激光.
主要成果:
- 在上使用的非捕获层QD激光器显示严重降解.
- 带有捕获层的QD激光器和GaAs上的QD激光器表现出更温和的降解.
- 在所有老QD激光器中观察到纳米尺度的脱位环.
- 确定点缺陷生成和迁移是主要降解源,导致非辐射重组和脱位循环形成.
结论:
- 点缺陷,而不是位移,是上的QD激光降解的主要原因.
- 建议采用浅蚀刻脊架制造和增长后化来提高激光的可靠性.
- 在生长过程中最大限度地减少点缺陷密度对于光子学中稳定的QD激光性能至关重要.
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