Leaky electronic states for photovoltaic photodetectors based on asymmetric superlattices

Penello, Germano Maioli; Pereira, Pedro Henrique; Pires, M. P.; Sivco, Deborah L.; Gmachl, Claire F.; Souza, P. L.

doi:10.1063/1.5006464

Cited by 14 publications

(17 citation statements)

References 26 publications

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“…In the case of the SLIPs presented so far, higher operating temperatures were not possible to be reached with the symmetric SLIPs due to their photoconductive operation mode. Asymmetric superlattice structures were then investigated to reach this goal …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Wavelengths shorter than 1.7 μm, in the near infrared, can be easily reached with band to band transitions using the InGaAlAs alloy with different compositions, while longer wavelengths require intraband transitions in quantum wells, which are, in principle, intrinsically limited by the band offsets of the heterostructures which is around 500 meV, corresponding to wavelengths longer than 2.5 μm. In order to meet these two challenges, specially designed superlattice structures proposed by our group were presented …”

Section: Introductionmentioning

confidence: 99%

“…Much work has been carried out in quantum cascade photodetectors (QCDs) which do not require bias . A simpler alternative is the use of asymmetric superlattices with the quantum well with a different thickness being placed out of the center . The asymmetric structure leads to wavefunctions in the continuum which are localized in one direction, like a perfect Bragg mirror, and extended in the other, establishing a preferential current flow direction and, consequently, abolishing the need of an applied bias for operation.…”

Section: Introductionmentioning

confidence: 99%

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Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

et al. 2019

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Herein, two challenges are addressed, which quantum well infrared photodetectors (QWIPs), based on III-V semiconductors, face, namely: photodetection within the so-called "forbidden gap", between 1.7 and 2.5 microns, and room temperature operation using thermal sources. First, to reach this forbidden wavelength range, a QWIP which consists of a superlattice structure with a central quantum well (QW) with a different thickness is presented. The different QW in the symmetric structure, which plays the role of a defect in the otherwise periodic structure, gives rise to localized states in the continuum. The proposed InGaAs/InAlAs superlattice QWIP detects radiation around 2.1 microns, beyond the materials bandoffset. Additionally, the wavefunction parity anomaly is explored to increase the oscillator strength of the optical transitions involving higher order states. Second, with the purpose of achieving room temperature operation, an asymmetric InGaAs/InAlAs superlattice, in which the QW with a different thickness is not in the center, is used to detect infrared radiation around 4 microns at 300 K. This structure operates in the photovoltaic mode because it gives rise to states in the continuum which are localized in one direction and extended in the other, leading to a preferential direction for current flow.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

et al. 2019

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Broadband Response and a Transformation between Dual‐ and Single‐Wavelength Detection in Coupled Doped‐Well Quantum Cascade Detector

Chen

et al. 2023

Adv Elect Materials

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As a third‐generation infrared detector, the quantum cascade detector (QCD) exhibits an accurately adjustable wavelength, low noise, and ultrafast response characteristics. By introducing an additional doping layer, QCD also shows excellent application prospects in the broadband response. Herein, a coupled doped‐well QCD with an array structure located at very long‐wave infrared (VLWIR, ≈15 µm) is prepared. Based on the energy levels interaction and carrier distribution, the regulatory mechanism of the applied bias on the response characteristics is explored. At zero bias, the detector exhibits dual‐wavelength detection owing to the splitting of the energy levels, then transforms into single‐wavelength detection with the bias increasing. Simultaneously, the QCD device exhibits a broadband response (≈13–16 µm) from 15 to 300 K and an excellent detectivity of 1.52 × 1012 cm Hz1/2 W−1 at 15 K. A high R0A (>106 Ω cm2) and robust detectivity (>109 cm Hz1/2 W−1) are obtained at room temperature. The results of the response characteristics presented in this work provide a strategy for the flexible application of QCD in infrared detection.

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Quantifying milk proteins using infrared photodetection for portable equipment

Szwarcman

Penello

Kawabata

et al. 2021

Journal of Food Engineering

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Leaky electronic states for photovoltaic photodetectors based on asymmetric superlattices

Cited by 14 publications

References 26 publications

Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

Broadband Response and a Transformation between Dual‐ and Single‐Wavelength Detection in Coupled Doped‐Well Quantum Cascade Detector

Quantifying milk proteins using infrared photodetection for portable equipment

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