CAJ | 학술논문

主要研究了太赫兹量子阱探测器读出电路中的暗电流抑制模块。首先从理论上分析了太赫兹量子阱探测器产生暗电流和光电流的原理。由于太赫兹量子阱探测器中电子输运行为非常复杂，难以通过理论推导建立精确等效电路模型的解析表达式。通过对太赫兹量子阱探测器的电流电压实验数据进行拟合，提出压控电流源等效电路模型。利用此模型设计读出电路信号源及暗电流抑制模块，结合读出电路进行仿真验证电路模型的准确性。发现与传统暗电流抑制电路相比，压控电流源电路模型能够在器件工作偏压变化时对其暗电流进行精确抑制，提高读出电路性能，因此更适合作为太赫兹量子阱探测器读出电路的暗电流抑制模块。
주요연구료태혁자양자정탐측기독출전로중적암전류억제모괴。수선종이론상분석료태혁자양자정탐측기산생암전류화광전류적원리。유우태혁자양자정탐측기중전자수운행위비상복잡，난이통과이론추도건립정학등효전로모형적해석표체식。통과대태혁자양자정탐측기적전류전압실험수거진행의합，제출압공전류원등효전로모형。이용차모형설계독출전로신호원급암전류억제모괴，결합독출전로진행방진험증전로모형적준학성。발현여전통암전류억제전로상비，압공전류원전로모형능구재기건공작편압변화시대기암전류진행정학억제，제고독출전로성능，인차경괄합작위태혁자양자정탐측기독출전로적암전류억제모괴。
The dark current suppression circuit and the equivalent circuit model of the terahertz quantum-well photode-tectors (QWPs)are introduced. The transport mechanisms of dark current and photocurrent are analyzed theoretical-ly. Because the transport model of terahertz QWPs is very complex,the analytical expression for the current-voltage relations used in the circuit model of terahertz QWPs cannot be obtained precisely. By fitting the experimental dark current-voltage and photocurrent-voltage data,the effective voltage controlled current source (VCCS)circuit model of terahertz QWPs is established. The effective circuit model is used to design the dark current suppression module and the signal source in readout circuit. The numerical simulation results show that the effective circuit model of terahertz QWPs works well. Compared with the traditional dark current suppression module,the VCCS circuit model can accu-rately suppress the dark current when the voltage of the terahertz QWPs changes. It’s more suitable for the dark cur-rent suppression module of the terahertz QWPs in the readout circuit.