liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Optical spectra of Zn1-xBexTe mixed crystals determined by IR-VIS-UV ellipsometry and photoluminescence measurements
University of Technology and Life Science, Bydgoszcz.
Linköping University, Department of Physics, Chemistry and Biology, Applied Optics . Linköping University, The Institute of Technology.ORCID iD: 0000-0001-9229-2028
Nicholas Copernicus University.
Nicholas Copernicus University.
Show others and affiliations
2011 (English)In: THIN SOLID FILMS, ISSN 0040-6090, Vol. 519, no 9, 2795-2800 p.Article in journal (Refereed) Published
Abstract [en]

Spectroscopic ellipsometry in the photon energy range from 0.04 eV to 6.50 eV is used for investigation of the optical response of Zn1-xBxTe crystals grown by a high-pressure Bridgman method in the composition range x andlt;= 0.12. Infrared spectra display absorption bands centred between 411 cm(-1) and 420 cm(-1) associated with BeTe-type optical phonon modes. The positions of the transverse-optical and longitudinal-optical phonon modes have been found by modelling the line shape of the complex dielectric functions, (epsilon) over tilde and Im(-(epsilon) over tilde (-1)), using a classical damped Lorentzian oscillator approach. Ellipsometric measurements in the VIS-UV range allow determination of the fundamental energy-gap (E-0) and the higher threshold energies (E-1, E-1 + Delta(1), E-2) originating from the band edge and spin-orbit splitting critical points. We have found that the Be content x = 0.12 causes an increase of the fundamental energy gap about 0.15 eV at room temperature when compared to the E-0 = 2.23 eV of ZnTe crystal at the same temperature. Photoluminescence spectra were measured in the temperature range from 30 K to room temperature. Luminescence at temperature Tandgt;200 K is very weak. The peak positions of the exciton emission lines agree well with the E-0 band-gaps derived from ellipsometric data if corrected for their temperature dependence.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND , 2011. Vol. 519, no 9, 2795-2800 p.
Keyword [en]
ZnBeTe, Ellipsometry, Dielectric function, Lattice vibration, Interband transitions, Photoluminescence
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-67703DOI: 10.1016/j.tsf.2010.12.043ISI: 000289174200049OAI: diva2:412602
Available from: 2011-04-26 Created: 2011-04-26 Last updated: 2013-10-14

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Arwin, Hans
By organisation
Applied Optics The Institute of Technology
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 19 hits
ReferencesLink to record
Permanent link

Direct link