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Tuning and tailoring of broadband quantum-well infrared photodetector responsivity spectrum
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Image of FIG. 1.
FIG. 1.

Bias dependence spectral responsivity of a broadband QWIP structure which is created by replacing single-QWs in the narrow-band structure by few period superlattices.

Image of FIG. 2.
FIG. 2.

Schematic conduction band diagram of a “stack design” broadband QWIP which consists of two stacks of MQW structures designed to respond at two different wavelengths ( and ) within the required broad wavelength band. and , and , and and pairs represent different number of wells, well-doping densities, and barrier thickness in each MQW structure.

Image of FIG. 3.
FIG. 3.

Bias voltage dependence spectral responsivity of three different “stack design” QWIPs. (a) Due to unequal impedance of the two stacks, detector SB1 shows spectral tunability with the bias voltage. As shown in (b) and (c), SB2, and SB3 are designed to produce nearly unchanged spectra within the operating bias voltage range.

Image of FIG. 4.
FIG. 4.

Schematic conduction band diagram of the “intermix design” of a broadband QWIP consisting of multiple periods of alternatively placed, dissimilar QWs.

Image of FIG. 5.
FIG. 5.

Bias voltage dependence of the spectral responsivity of an “intermix design” broadband QWIP.


Generic image for table
Table I.

Design parameters of three different “stack design” broadband QWIPs.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tuning and tailoring of broadband quantum-well infrared photodetector responsivity spectrum