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Systematic study of different transitions in high operating temperature quantum dots in a well photodetectors

机译:井光电探测器中高工作温度量子点中不同跃迁的系统研究

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We report a systematic study of different transitions in quantum dots-in-a-well infrared photodetectors in order to optimize the signal to noise ratio of the detector. Bound to continuum transitions offer very high extraction probability for photoexcited electrons but poor absorption coefficient, while the bound to bound transitions have higher absorption but poorer extraction probability. Bound to quasibound transitions are optimum for intermediate values of electric fields with superior signal to noise ratio. The bound to quasibound device has the detectivity of 4×1011 cm Hz1/2 W-1 (3V, f/2 system) at 77 K and 7.4×108 cm Hz1/2 W-1 at 200 K, which is highest reported detectivity at 200 K for detector with long wave cutoff wavelength.
机译:我们报告了井中量子点红外光电探测器中不同跃迁的系统研究,以优化探测器的信噪比。束缚到连续跃迁为光激发电子提供了非常高的提取概率,但是吸收系数很低,而束缚到跃迁的跃迁具有更高的吸收率,但是提取率却很差。对于具有优异信噪比的电场中间值,束缚到准束缚过渡是最佳的。准结合器件的结合在77 K时具有4×1011 cm Hz1 / 2 W-1(3V,f / 2系统)的检测率在200 K时具有7.4×108 cm Hz1 / 2 W-1的检测率对于长波截止波长的探测器,在200 K下。

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