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Spectral response, dark current, and noise analyses in resonant tunneling quantum dot infrared photodetectors

机译:共振隧穿量子点红外光电探测器中的光谱响应,暗电流和噪声分析

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摘要

Reduction of dark current at high-temperature operation is a great challenge in conventional quantum dot infrared photodetectors, as the rate of thermal excitations resulting in the dark current increases exponentially with temperature. A resonant tunneling barrier is the best candidate for suppression of dark current, enhancement in signal-to-noise ratio, and selective extraction of different wavelength response. In this paper, we use a physical model developed by the authors recently to design a proper resonant tunneling barrier for quantum infrared photodetectors and to study and analyze the spectral response of these devices. The calculated transmission coefficient of electrons by this model and its dependency on bias voltage are in agreement with experimental results. Furthermore, based on the calculated transmission coefficient, the dark current of a quantum dot infrared photodetector with a resonant tunneling barrier is calculated and compared with the experimental data. The validity of our model is proven through this comparison. Theoretical dark current by our model shows better agreement with the experimental data and is more accurate than the previously developed model. Moreover, noise in the device is calculated. Finally, the effect of different parameters, such as temperature, size of quantum dots, and bias voltage, on the performance of the device is simulated and studied. (C) 2016 Optical Society of America
机译:在常规量子点红外光电探测器中,降低高温操作下的暗电流是一个巨大的挑战,因为导致暗电流的热激发速率随温度呈指数增长。共振隧穿势垒是抑制暗电流,增强信噪比以及选择性提取不同波长响应的最佳候选者。在本文中,我们使用作者最近开发的物理模型为量子红外光电探测器设计合适的共振隧穿势垒,并研究和分析这些器件的光谱响应。通过该模型计算出的电子传输系数及其对偏置电压的依赖性与实验结果吻合。此外,基于计算出的透射系数,计算出具有共振隧穿势垒的量子点红外光电探测器的暗电流,并将其与实验数据进行比较。通过这种比较证明了我们模型的有效性。我们模型的理论暗电流显示出与实验数据更好的一致性,并且比以前开发的模型更准确。此外,计算设备中的噪声。最后,模拟并研究了温度,量子点大小和偏置电压等不同参数对器件性能的影响。 (C)2016美国眼镜学会

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