Measurement of the concentration of 2D electrons in δ-doped InGaAs/GaAs pseudomorphic transistor structures using the photoluminescence spectroscopy
Concentration of 2D electrons n s is measured in the modulation-doped PHEMT structures with the aid of two photoluminescence (PL) methods using halfwidth of the 1e-1hh band and the energy difference E F - E 1 e in the experimental PL spectra. The applicability of the methods is analyzed, and a metho...
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Veröffentlicht in: | Journal of communications technology & electronics 2013-03, Vol.58 (3), p.243-249 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Concentration of 2D electrons
n
s
is measured in the modulation-doped PHEMT structures with the aid of two photoluminescence (PL) methods using halfwidth of the 1e-1hh band and the energy difference
E
F
-
E
1
e
in the experimental PL spectra. The applicability of the methods is analyzed, and a method for the determination of energy
E
F
from the temperature dependence of the intensity ratio of the 2e-1hh and 1e-1hh bands is proposed. It is demonstrated that concentrations
n
s
are in good agreement with the results of the Hall-effect measurements at relatively low concentrations (
n
s
≤ 2.5 × 10
12
) when the parallel conduction along the δ layer is absent. At stronger doping, the PL methods yield more accurate concentrations
n
s
. |
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ISSN: | 1064-2269 1555-6557 |
DOI: | 10.1134/S1064226913030133 |