Performance Trade Offs in the Quantum Well Infra-Red Detector

1992 ◽  
pp. 31-42 ◽  
Author(s):  
M. J. Kane ◽  
S. Millidge ◽  
M. T. Emeny ◽  
D. Lee ◽  
D. R. P. Guy ◽  
...  
Keyword(s):  
Quantum Well ◽  
Trade Offs ◽  
Infra Red

scholarly journals Coarse-grained tight-binding models

2021 ◽  
Author(s):  
Tianxiang Liu ◽  
Li Mao ◽  
Mats-Erik Pistol ◽  
Craig Pryor
Keyword(s):  
Quantum Well ◽  
Computing Time ◽  
Numerical Test ◽  
Tight Binding ◽  
Computation Time ◽  
Coarse Grained ◽  
Weakly Bound ◽  
Trade Offs ◽  
Full Calculation ◽  
Binding Models

Abstract Calculating the electronic structure of systems involving very different length scales presents a challenge. Empirical atomistic descriptions such as pseudopotentials or tight-binding models allow one to calculate the effects of atomic placements, but the computational burden increases rapidly with the size of the system, limiting the ability to treat weakly bound extended electronic states. Here we propose a new method to connect atomistic and quasi-continuous models, thus speeding up tight-binding calculations for large systems. We divide a structure into blocks consisting of several unit cells which we diagonalize individually. We then construct a tight-binding Hamiltonian for the full structure using a truncated basis for the blocks, ignoring states having large energy eigenvalues and retaining states with an energy close to the band edge energies. A numerical test using a GaAs/AlAs quantum well shows the computation time can be decreased to less than 5% of the full calculation with errors of less than 1%. We give data for the trade-offs between computing time and loss of accuracy. We also tested calculations of the density of states for a GaAs/AlAs quantum well and find a ten times speedup without much loss in accuracy.

Quantum well infra-red photodetector response controlled by very low power visible source

1992 ◽  
Vol 28 (21) ◽  
pp. 1980 ◽  
Author(s):  
V. Berger ◽  
N. Vodjdani
Keyword(s):  
Quantum Well ◽  
Low Power ◽  
Infra Red

Optical characterisation of quantum well infra-red detector structures

1999 ◽  
Vol 146 (2) ◽  
pp. 89-92 ◽  
Author(s):  
A. Guzmán ◽  
J. M. G. Tijero ◽  
L. J. Gómez ◽  
J. Hernando ◽  
J. J. Sánchez ◽  
...  
Keyword(s):  
Quantum Well ◽  
Infra Red

DENSITY OF STATES AND CHARGE DISTRIBUTION IN LIGHTLY DOPED AND COMPENSATED QUANTUM WELL

1989 ◽  
Vol 03 (11) ◽  
pp. 815-819
Author(s):  
E.A. DE ANDRADA E SILVA ◽  
I.C. DA CUNHA LIMA
Keyword(s):  
Quantum Well ◽  
Charge Distribution ◽  
Density Of States ◽  
Impurity Band ◽  
Band Model ◽  
Two Dimensional ◽  
Bohr Radius ◽  
Coulomb Gap ◽  
Bulk Semiconductors ◽  
Infra Red

In this letter we use a Semi-Classical Impurity Band Model and obtain by Monte Carlo simulation the density of states (DOS) and the impurity charge distribution inside a quantum well (QW) of Ga 1−x Al x As/GaAs . We show the existence of a Coulomb gap as has been observed in bulk semiconductors. The DOS is not very sensitive to the QW width close to the Coulomb gap, at least in the range from 1 to 4 times the Bohr radius, and shows a behavior D(E)∝|E−EF| which indicates a two-dimensional signature. We show that the neutral donors concentrate in the center of the well according to a distribution whose width and decay rate depend on the compensation and impurity concentration respectively. Those effects are expected to be observed by infra-red absorption experiments and useful in device diagnosis.

Normal incidence multiple spectra type-II AlAs/AlGaAs quantum well infra-red detector

1992 ◽  
Vol 28 (15) ◽  
pp. 1468 ◽  
Author(s):  
L.S. Yu ◽  
S.S. Li ◽  
P. Ho
Keyword(s):  
Quantum Well ◽  
Normal Incidence ◽  
Type Ii ◽  
Infra Red

Two-colour quantum well infra-red photodetector with peak sensitivities at 3.9 and 8.1 µm

1994 ◽  
Vol 30 (16) ◽  
pp. 1352-1353 ◽  
Author(s):  
K.L. Tsai ◽  
C.P. Lee ◽  
J.S. Tsang ◽  
H.R. Chen
Keyword(s):  
Quantum Well ◽  
Infra Red

Long wavelength broadband normal incidence AlAs/AlGaAs X-valley quantum well infra-red phototector

1993 ◽  
Vol 29 (2) ◽  
pp. 213 ◽  
Author(s):  
Y. Zhang ◽  
N. Baruch ◽  
W.I. Wang
Keyword(s):  
Quantum Well ◽  
Normal Incidence ◽  
Long Wavelength ◽  
Infra Red
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