Optical analysis of doped PbTe samples using UV- VIS and IR ellipsometry
Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesis
Lead-tin telluride alloy, Pb1-xSnxTe, is a narrow band gap group IV–VI semiconductor with NaCl-like crystalline structure. This material has interesting electronic properties, which makes it suitable for designing infrared photo detectors, diode lasers, and thermo-photovoltaic energy converters. In this project, we used spectroscopic ellipsometry in the spectral range of 0.74–6.5 eV to probe the linear optical response of Pb1-xSnxTe alloys in terms of the complex dielectric function. A strong optical response in the range of 0.7-2.0 eV arising from optical absorption was found. We studied eleven different samples of Pb1-xSnxTe of p-type origin with x values in the range (0 ≤ x ≤ 1). They were prepared by means of molecular beam epitaxy (MBE) on BaF2 substrates with 15mm2 area.
Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi , 2007. , 34 p.
Linear, optical, response, spectroscopic, ellipsometry, analysis, PbTe
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:liu:diva-10435ISRN: LITH-IFM-EX-07/1854-SEOAI: oai:DiVA.org:liu-10435DiVA: diva2:17176
2007-09-28, Röntgen (P404), B-House, SE-581 83, Linköping, 10:15