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Point Defects in Semiconductors I

53,49 €*

Sofort verfügbar, Lieferzeit: 1-3 Tage

Produktnummer: 18278c4e450842478c8fee830aaed406b0
Autor: Lannoo, M.
Themengebiete: Gitterfehler Halbleiter band structure band theory crystal crystallographic defect crystal structure diffusion electron electron correlations
Veröffentlichungsdatum: 10.01.2012
EAN: 9783642815768
Sprache: Englisch
Seitenzahl: 265
Produktart: Kartoniert / Broschiert
Verlag: Springer Berlin
Untertitel: Theoretical Aspects
Produktinformationen "Point Defects in Semiconductors I"
From its early beginning before the war, the field of semiconductors has developped as a classical example where the standard approximations of 'band theory' can be safely used to study its interesting electronic properties. Thus in these covalent crystals, the electronic structure is only weakly coupled with the atomic vibrations; one-electron Bloch functions can be used and their energy bands can be accurately computed in the neighborhood of the energy gap between the valence and conduction bands; nand p doping can be obtained by introducing substitutional impurities which only introduce shallow donors and acceptors and can be studied by an effective-mass weak-scattering description. Yet, even at the beginning, it was known from luminescence studies that these simple concepts failed to describe the various 'deep levels' introduced near the middle of the energy gap by strong localized imperfections. These imperfections not only include some interstitial and many substitutional atoms, but also 'broken bonds' associated with surfaces and interfaces, dis location cores and 'vacancies', i.e., vacant iattice sites in the crystal. In all these cases, the electronic structure can be strongly correlated with the details of the atomic structure and the atomic motion. Because these 'deep levels' are strongly localised, electron-electron correlations can also playa significant role, and any weak perturbation treatment from the perfect crystal structure obviously fails. Thus, approximate 'strong coupling' techniques must often be used, in line' with a more chemical de scription of bonding.
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