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量子阱参数如势阱宽度、势垒高度和阱中的掺杂浓度决定了阱中的能级分布及光学吸收,它和量子阱红外探测器(QWIP)的响应波长、暗电流、响应率、探测率等特性参数密切相关。为了使设计的QWIP达到预期的各种性能指标,对其各参量进行了精心设计。运用量子阱的第一激发态与势垒的高度接近时产生共振效应,进行了量子阱的优化设计,得出垒高和阱宽的关系。另外,根据器件光谱响应的要求,利用传输矩阵法计算出相应的量子阱参数。此设计方法在GaAs/AlGaAs长波-长波双色QWIP中得到了较好的验证。
Quantum well parameters such as the well width, the barrier height, and the doping concentration in the well determine the energy level distribution and optical absorption in the well, which is related to the QWIP response wavelength, dark current, response, Detection rate and other characteristic parameters are closely related. In order to make the design of QWIP achieve the expected various performance indicators, its parameters were carefully designed. When the first excited state of the quantum well and the height of the potential barrier are close to each other, a resonance effect is generated. The optimized design of the quantum well is performed to obtain the relationship between the height of the well and the width of the well. In addition, according to the requirements of the spectral response of the device, the corresponding quantum well parameters are calculated by using the transfer matrix method. This design method is well validated in GaAs / AlGaAs longwave-long wavelength two-color QWIP.