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(英)量子阱红外探测器峰值探测波长的精确设计与实验验证

Keywords: 量子阱红外探测器,GaAs/AlGaAs,峰值波长,光谱响应,能带非抛物线性

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Abstract:

采用单能带电子有效质量近似(EMA)和波包函数近似(EFA)模型,考虑了能带非抛物线性等高阶因素,并利用投试法求解薛定谔方程,计算了准确设计峰值探测波长的GaAs/AlGaAs量子阱探测器结构参数.基于计算结果,用分子束外延(MBE)方法生长了设计峰值波长为8μm的GaAs/AlGaAs多量子阱材料,进而制备了单元器件,并测试了I-V曲线、光谱响应和探测率.I-V曲线的良好对称性显示了材料生长与器件制备工艺的质量,光谱响应曲线表明器件实际的峰值探测波长为7.96~7.98μm,与设计预期值吻合.

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