Voltage-tunable multiple quantum well photodetector vertically integrated with voltage-tunable multiple quantum well filter

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Abstract
We present a n‐i[multiple quantum well (MQW)]‐p‐i(MQW)‐n device wherein the bottom MQW functions as a voltage‐tunable photodetector and the top MQW functions as a voltage‐tunable filter, allowing enhanced detectivity at the exciton wavelength compared to photon energies below or above the band gap. Thus this device more closely approximates a true single wavelength, voltage‐tunable photodetector. We achieve about 2–1 selectivity over a tuning range of 14 nm with 12 V operation.

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