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Numerical analysis of the compositional graded quaternary barrier AlGaN-based ultraviolet-C light-emitting diode

Shahzeb Malik Muhammad Usman Masroor Hussain Munaza Munsif Sibghatullah Khan Saad Rasheed Shazma Ali
Opto-Electronics Review | 2021 | 29 | 3 | 80-84 | DOI: 10.24425/opelre.2021.135831
Keywords ultraviolet light-emitting diodes efficiency quantum wells
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Abstract

The compositional graded quaternary barriers (GQBs) instead of ternary/conventional quantum barriers (QBs) have been used to numerically enhance the efficiency of AlGaN-based ultraviolet light-emitting diode (LED). The performance of LED with GQBs is examined through carrier concentrations, energy band diagrams, radiative recombination, electron and hole flux, internal quantum efficiency (IQE), and emission spectrum. As a function of the operating current density, a considerable reduction in efficiency droop is observed in the device with composition-graded quaternary barriers as compared to the conventional structure. The efficiency droop in case of a conventional LED is ~77% which decreased to ~33% in case of the proposed structure. Moreover, the concentration of electrons and holes across the active region in case of the proposed structure is increased to ~156% and ~44%, respectively.
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Authors and Affiliations

Shahzeb Malik
1
Muhammad Usman
1
ORCID: ORCID
Masroor Hussain
2
Munaza Munsif
1
Sibghatullah Khan
1
Saad Rasheed
1
Shazma Ali
1
  1. Faculty of Engineering Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, 23460, Khyber Pakhtunkhwa, Pakistan
  2. Faculty of Computer Sciences and Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, 23460, Khyber Pakhtunkhwa, Pakistan

Magnetospectroscopy of double HgTe/CdHgTe QWs with inverted band structure in high magnetic fields up to 30 T

L.S. Bovkun A.V. Ikonnikov V.Ya. Aleshkin K.V. Maremyanin N.N. Mikhailov S.A. Dvoretskii S.S. Krishtopenko F. Teppe B.A. Piot M. Potemski M. Orlita V.I. Gavrilenko
Opto-Electronics Review | 2019 | vol. 27 | No 2 | 213-218
Keywords HgTe/CdHgTe heterostructures Double quantum wells Far-IR magnetospectroscopy Landau levels
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Abstract

Magnetoabsorption in far and mid IR ranges in double HgTe/CdHgTe quantum wells with inverted band structure has been studied in high magnetic fields up to 30 T. Numerous intraband and interband transitions have been revealed in the spectra and interpreted within axial 8 × 8 k·p model. Splitting of dominant magnetoabsorption lines resulting from optical transitions from hole-like zero-mode Landau level has been discovered and discussed in terms of a built-in electric field and collective phenomena.

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Authors and Affiliations

L.S. Bovkun
A.V. Ikonnikov
V.Ya. Aleshkin
K.V. Maremyanin
N.N. Mikhailov
S.A. Dvoretskii
S.S. Krishtopenko
F. Teppe
B.A. Piot
M. Potemski
M. Orlita
V.I. Gavrilenko

Magnetospectroscopy of CdTe/Cd 1-xMg xTe modulation-doped quantum wells in THz and visible range

Jerzy Łusakowski Maciej Zaremba Adam Siemaszko Krzysztof Karpierz Zbigniew Adamus Tomasz Wojtowicz
Opto-Electronics Review | 2023 | 31 | 2 | e144597 | DOI: 10.24425/opelre.2023.144597
Keywords terahertz spectroscopy optically detected cyclotron resonance modulation-doped CdTe quantum wells
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Abstract

Transport, photoluminescence, THz transmission, and optically detected cyclotron resonance studies were carried out on samples with a single modulation-doped CdTe/Cd 1-xMg xTe quantum well. THz experiments were performed at liquid helium temperatures for photon energies between about 0.5 meV and 3.5 meV. An effective mass of electron was determined to be (0.1020±0.0003)m 0. Observed photoluminescence and optically detected cyclotron resonance spectra cannot be explained within the simple model of Landau quantization of parabolic bands.
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Authors and Affiliations

Jerzy Łusakowski
1
ORCID: ORCID
Maciej Zaremba
1
Adam Siemaszko
1
Krzysztof Karpierz
1
Zbigniew Adamus
2 3
ORCID: ORCID
Tomasz Wojtowicz
4
ORCID: ORCID
  1. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  2. Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  3. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  4. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland

Terahertz response of CdTe/Cd 1-xMg xTe modulation-doped multiple quantum wells

Jerzy Łusakowski Andrzej Frączak Mikołaj Grymuza Eryk Imos Adam Siemaszko Wiktoria Solarska Aniela Woyciechowska Maciej Zaremba Rafał Zdunek Krzysztof Karpierz Zbigniew Adamus Tomasz Słupiński Tomasz Wojtowicz
Opto-Electronics Review | 2023 | 31 | 2 | e144600 | DOI: 10.24425/opelre.2023.144600
Keywords terahertz spectroscopy Shubnikov-de Haas oscillations modulation-doped multiple CdTe-based quantum wells
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Abstract

Terahertz (THz) transmission, photoresistance, and electrical conductivity experiments were carried out at 4.2 K on a sample with modulation-doped CdTe/Cd 1-xMg xTe multiple quantum wells. The measurements were carried out as a function of a magnetic field B up to 9 T and a radiation frequency between 0.1 and 0.66 THz. A broad minimum in the transmission curve was observed at magnetic fields corresponding to the cyclotron resonance at given THz frequency which was followed at larger fields by an oscillatory signal, periodic in B −1. Shubnikov-de Haas oscillations were observed in magnetoconductivity and in photoresistance. Each of these experimental signals revealed the same electron concentration equal to (1.01 ± 0.03) ∙1012 cm −2. THz spectroscopy results are compared with data obtained on a single quantum well and are discussed from the point of view of using such multiple quantum wells as THz optical elements.
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Authors and Affiliations

Jerzy Łusakowski
1 2
ORCID: ORCID
Andrzej Frączak
1
Mikołaj Grymuza
1
Eryk Imos
1
Adam Siemaszko
1
Wiktoria Solarska
1
Aniela Woyciechowska
1
Maciej Zaremba
1
Rafał Zdunek
1
Krzysztof Karpierz
1
Zbigniew Adamus
3 4
ORCID: ORCID
Tomasz Słupiński
3 4
ORCID: ORCID
Tomasz Wojtowicz
3
ORCID: ORCID
  1. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  2. CENTERA Laboratories, Institute of High-Pressure Physics, Polish Academy of Sciences, Sokołowska 29, 01-142 Warsaw, Poland
  3. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  4. Institute of Physics,Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland

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