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Fundamental Absorption of Semiconductor Quantum Dots
PDF ISBN: 9781510623019 | Print ISBN: 9781510623026
This Spotlight describes the process of fundamental absorption in a variety of quantum dot (QD) geometries, such as spherical, cylindrical, ellipsoidal, lens-shaped, conical, and spherical layered, including in the presence of external fields. Other topics include the effect of exciton effects on the interband absorption coefficients and the application of QD ensembles in QD-LED devices. The mathematics involved is presented with as much detail as possible, and readers need only be familiar with semiconductor physics and quantum mechanics.
This Spotlight describes the mechanism of fundamental absorption in different
types of quantum dots (QDs). The detailed discussion of the absorption mechanism
in the spherical QD is presented for three regimes of size quantization
(strong, weak, and intermediate). The same calculations are done for the cylindrical,
ellipsoidal, conical, and spherical nanolayered QDs, taking into account the
specific forms of the mentioned structures. Absorption of long-wave radiation
by electron gas localized in a lens-shaped QD is considered as an example of
the multiparticle optical effect. The dependence of the threshold frequencies on
the geometrical sizes is plotted for each type of QD. Selection rules for interband
transitions between quantum levels are revealed. The effects of external magnetic
and electric fields on the absorption spectra and selection rules are presented.
The problem of the application of ensembles of QDs in QD-light-emitting-diode
devices is discussed.