The absorption coefficient for sputtered PbxSn1–xO2 films with x e (0,0.7) in the region of absorption edge is determined by the analysis of transmission and reflection spectra. It is shown that the optical energy gap varies parabolically with x, ranging from the value 3.40 eV for x = 0 to 1.68 eV for x = 1. The value of bowing parameter is determined to be 0.79 eV. The average temperature coefficient – (dEg/dT) is also calculated to be 4.5 × 10−4 eV/K approximately the same for all compositions.
Der Absorptionskoeffizient fur durch Kathodenzerstaubung hergestellte PbxSn1–xO2-Schichten mit x e (0;0,7) im Absorptionskantenbereich wird aus der Transmission und Reflexion berechnet. Es zeigt sich, das die Bandlucke der Schichten eine parabolische Funktion der Variablen x ist, die sich von 3,40 eV fur x = 0 bis 1,68 eV fur x = 1 andert. Der erhaltene Wert des „bowing parameter” ist 0,79 eV. Der Mittelwert des Temperaturkoeffizienten – (dEg/dT) betragt 4,5 × 10−4 eV/K und ist ungefahr fur alle Schichten mit verschiedenen x-Werten derselbe.
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