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Modeling and analysis of photoconductive detectors based on Hg_(1-x)Cd_x Te for free space optical communication

机译：基于Hg_（1-x）Cd_x Te的自由空间光通信光电导探测器的建模与分析

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摘要

In this paper we report a theoretical analysis of a long wavelength photoconductive detector for characterizing and optimizing the device in respect of voltage responsivity, quantum efficiency, detectivity and noise equivalent power. The model has been applied to examine the potential of an n-type Hg_(0.77)Cd_(0.23)Te photoconductive detector for possible application in free space optical communication system operating at the atmospheric window near 9.6 μ m. In the present analysis we have taken into account all the major recombination mechanisms (e.g., Radiative, Auger, and Shockley-Read-Hall types) including the effect of surface recombination at the interfaces that shape the characteristics of photo-conductor. The results obtained on the basis of our analysis reveal that in the absence of surface recombination the device exhibits a peak quantum efficiency of 90%, a maximum detectivity of 10~8 MHz~(1/2)/W at 77 K, a 3 dB bandwidth of 117.86MHz and noise voltage of 5.4 × 10~(-6) V/Hz~(1/2). The sweep-out effect has been found to degrade the detectivity nearly by a factor of 10 at the same temperature and wavelength of operation. The estimated noise equivalent power of the photodetector is of the order of 10~(-9) W at 9.6 μm wavelength.
机译：在本文中，我们报告了一种长波长光电导检测器的理论分析，用于在电压响应率，量子效率，检测率和噪声等效功率方面表征和优化该器件。该模型已用于检查n型Hg_（0.77）Cd_（0.23）Te光电导检测器的电势，可用于在9.6μm的大气窗口附近工作的自由空间光通信系统中。在当前的分析中，我们考虑了所有主要的重组机制（例如，辐射型，俄歇型和肖克利-雷德霍尔类型），包括在影响光电导体特性的界面处的表面重组效应。根据我们的分析结果，结果表明，在没有表面重组的情况下，该器件的峰值量子效率为90％，在77 K时，最大探测率为10〜8 MHz〜（1/2）/ W。 dB带宽为117.86MHz，噪声电压为5.4×10〜（-6）V / Hz〜（1/2）。已经发现，在相同的工作温度和波长下，清除效应会使检测率降低近10倍。光电探测器的估计噪声等效功率在9.6μm波长下约为10〜（-9）W。

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