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电子波干涉法是一种新的量子阱探测器能带结构计算方法,该方法是基于电子波在量子阱界面的反射和干涉效应提出的。利用电子波干涉法,设计了一种新型的宽带量子阱红外探测器。对这种探测器的能带结构进行了计算,分析了这种新型探测器的响应带宽和暗电流特性。理论计算表明:电子在干涉形成的分离能级间跃迁可形成多个响应带,这些响应带之间相互交叠可实现宽带响应;器件的暗电流在微安量级且随温度的变化不大。共振隧穿电流随温度的变化较小,是暗电流的主要组成部分;而热离子激发电流随温度的变化较大,但对暗电流的影响不大。
Electron wave interference method is a new method for calculating the energy band structure of quantum well detectors. The method is based on the reflection and interference effects of the electron waves at the quantum well interface. A new type of wideband quantum well infrared detector is designed by using the method of electronic wave interference. The band structure of this detector was calculated and the response bandwidth and dark current characteristics of this new detector were analyzed. Theoretical calculations show that the electron can form multiple response bands during the transition between the separation levels formed by the interferences, and the response bands overlap each other to achieve a broadband response. The dark current of the device is in the order of microamperes with little change in temperature . Resonant tunneling current with small changes in temperature is the main component of dark current; while the thermal ion excitation current changes with temperature larger, but the impact on the dark current is not.