量子阱态和载流子散射时间对SCH激光器光电特性不连续性的作用
The role of quantum-well states and carrier scattering times on discontinuities in opto-electrical characteristics of SCH lasers
摘要：
利用Synopsys公司的Sentaurus TCAD中的漂移扩散计算机模拟模型，研究了基于$AlGaAs$的分离限制异质结激光器的电学、I-V和光学特性。我们研究了量子阱有源区的宽度和深度在激光阈值以下和以上的作用。器件的性质取决于两个，绑定量子阱状态的数量和最高绑定状态的接近传导或价带偏移。在一定的量子阱宽度或高度下，可能不存在激光作用，阈值电流是这些参数的不连续函数。这种影响在低温下更为明显。在某些条件下，在温度依赖性中也发现了特性的不连续性。载流子在量子阱上的散射时间对不连续性的振幅起着决定性的作用。
英文摘要：
Drift-diffusion computer simulations model available in Synopsys' Sentaurus TCAD is used to study electrical, I-V, and optical, I-L, characteristics of separate-confinement heterostructure laser based on $AlGaAs$. We investigate the role of the width and depth of Quantum Well (QW) active region, below and above the lasing threshold. The device properties depend on both, the number of bound QW states and on closeness of the highest bound states to conduction or valence band offset. The lasing action may not exist at certain widths or hights of QW, and the threshold current is a discontinuous function of these parameters. The effects are more pronounced at low temperatures. Discontinuities in characteristics are found, at certain conditions, in temperature dependencies as well. The carriers scattering time on QW is shown to have the crucial role on amplitude of discontinuities.
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