Show simple item record
dc.contributor.author |
Janíček, Petr |
|
dc.contributor.author |
Drašar, Čestmír |
|
dc.contributor.author |
Krejčová, Anna |
|
dc.contributor.author |
Lošťák, Petr |
|
dc.contributor.author |
Navrátil, Jiří |
|
dc.date.accessioned |
2012-03-15T11:13:49Z |
|
dc.date.available |
2012-03-15T11:13:49Z |
|
dc.date.issued |
2010 |
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dc.identifier |
Univerzitní knihovna (studovna) |
|
dc.identifier.isbn |
978-80-7395-386-7 (Online) |
|
dc.identifier.isbn |
978-80-7395-368-3 (Print) |
|
dc.identifier.issn |
1211-5541 |
|
dc.identifier.uri |
http://hdl.handle.net/10195/42632 |
|
dc.description.abstract |
Bi2–xTlxSe3 single crystals with the Tl content of cTl = 0 to 5.2×1024 atoms m–3 prepared from the elements of 5N purity by means of a modified Bridgman method were characterized by the measurements of infrared reflectance and
transmittance. The values of the plasma resonance frequency Tp, optical relaxation time J, and high-frequency permittivity g4 were determined by fitting the reflectance spectra using plasma-resonance formula. It was found that the
substitution of Tl atoms for Bi atoms in the Bi2Se3 crystal lattice leads to a decrease in the wp values implying a decrease in the free carrier concentration. This effect is explained within a model of the point defects in the crystal lattice of Bi2–xTlxSe3. The dependences of the absorption coefficient K on the energy of incident photons were determined from the transmittance spectra. The optical 76 Janíček P. et al./Sci. Pap. Univ. Pardubice Ser. A 16 (2010) 75–85
width of the energy gap decreases with the increasing Tl content. The values of the
exponent $ from the relation of K ~ 8$ for the long-wavelength absorption edge range within the interval from 2.1 to 2.5 indicating the dominant scattering mechanism of free current carriers is the scattering on acoustic phonons. |
eng |
dc.format |
p. 75-85 |
|
dc.language.iso |
eng |
|
dc.publisher |
Univerzita Pardubice |
cze |
dc.relation.ispartof |
Scientific papers of the University of Pardubice. Series A, Faculty of Chemical Technology. 16 (2010) |
|
dc.subject |
infrared reflectance |
eng |
dc.subject |
Bridgman method |
eng |
dc.subject |
transmittance |
eng |
dc.title |
Optical properties of Tl-doped Bi2Se3 single crystals |
eng |
dc.type |
Article |
eng |
dc.identifier.signature |
47333-16 |
|
dc.peerreviewed |
yes |
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dc.publicationstatus |
published |
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