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Theoretical and experimental operating wavelength of GaAs/Al0.25Ga0.75As IR photodetectors
Published online by Cambridge University Press: 31 January 2009
Abstract
IR photodetectors based on GaAs/Al0.25Ga0.75As multiquantum wells
(QWIP) grown by molecular beam epitaxy (MBE) are studied. The envelop
function formalism is used to determine the theoretical intersubband
transition energies. The electronic states are calculated in both parabolic
and non parabolic cases. IR spectroscopy transmission is used as the
experimental technique to evaluate the optical absorption. The measures are
made at 77 K for incidence at both 45° and Brewster angles geometries.
The last experimental results compare well with the theoretical ones and
correspond to 10–12 $\mu $m operating wavelength.
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- © EDP Sciences, 2009
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