外加条件及两种电子传输对量子点红外探测器噪声的影响

Influence of the Preset Condition and the Two Electrons Transport on the Noise of the Quantum Dot Infrared Photodetectors

基于外加电场对电子漂移速度的影响,考虑激发能对微米尺度和纳米尺度电子传输的依赖,通过计算仿真研究了外加条件及两种电子传输对量子点红外探测器噪声的影响.结果表明:在2545kV/cm外加电场下,噪声模型和实验数据吻合;噪声随着外加电场和温度的增加而增加,当温度小于80K时噪声增加迅速,而当温度大于80K时噪声增加缓慢,并且温度越低噪声随外加电场变化越明显;噪声不随微米尺度电子传输激发能的变化而变化,随着纳米尺度电子传输激发能的增加而减小,随着纳米尺度电子传输激发能变化速度的增加而增加.该研究可为量子点红外探测器的优化设计和性能提高提供理论参考.

The influence of preset condition and the two electrons transport on the noise of the quantum dot infrared photodetectors was calculated and simulated,which was based on the noise model including the influence of the electric field on the drift velocity of electrons,moreover,with account taken of the dependence of the activation energy on the microscale and the nanoscale electron transport.The results show that the noise model has a good agreement with the experimental data at 2545kV/cm electric field.The noise increases with the electric field and temperature,the noise increases rapidly below 80 K,but it increases slowly above 80 K,and when the temperature is lower,the change of the noise is more obvious with the change of the electric field.The noise does not change along with the change of the activation energy under the microscale electron transport,decreases with increasing the activation energy under the nanoscale electron transport,and increases with increasing the change rate of the activation energy under the nanoscale electron transport.The research can guide the design and improve the performance of the quantum dot infrared photodetectors.