Far-infrared spectroscopy of PbTe doped with iron

Far infrared reflection spectra, at room and liquid nitrogen temperature, of PbTe single crystals doped with iron are presented. Plasma minima were observed at about 160 cm?1 and 180 cm?1 for room and liquid nitrogen temperature, respectively. Using the reflectivity diagrams and their minima the val...

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Bibliographic Details
Published in:Journal of the Serbian Chemical Society 2002, Vol.67 (6), p.415-423
Main Authors: Nikolic, Pantelija, Radulovic, K., Vasiljevic-Radovic, D., Blagojevic, V., Milosavljevic, B., Dohcevic-Mitrovic, Zorana
Format: Article
Language:English
Subjects:
doped
infrared spectroscopy
lead telluride
plasma
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Summary:Far infrared reflection spectra, at room and liquid nitrogen temperature, of PbTe single crystals doped with iron are presented. Plasma minima were observed at about 160 cm?1 and 180 cm?1 for room and liquid nitrogen temperature, respectively. Using the reflectivity diagrams and their minima the values of the hole concentrations and their mobility at both temperatures were calculated and compared with galvanomagnetic measurements. All these results indicated that when PbTe is doped with a small concentration of Fe, the hole concentration is reduced by one order of magnitude and the free carrier mobility is larger when compared to pure PbTe. Prikazani su refleksioni opticki spektri za monokristalni olovo-telurid snimljeniu dalekoj infracrvenoj oblasti. Plazma-minimum posmatran je na oko 160cm?1 i 180cm?1 na sobnoj temperaturi i na temperaturi tecnog azota respektivno. Koncentracije slobodnih nosilaca ? supljina i njihove pokretljivosti izracunate su za obe temperature koriscenjem refleksionih dijagrama. Dobijene vrednosti su uporedjivane sa galvanomagnetnim merenjima. Dobijeni rezultati pokazuju da je koncentracija supljina u PbTe dopiranom malom koncentracijom Fe, smanjena za red velicine i da je njihova pokretljivost veca u poredjenju sa cistim PbTe.
ISSN:0352-5139
1820-7421
DOI:10.2298/JSC0206415N