Carrier type reversal in Pb modified Se80In20 semiconducting glassy alloys

RAM, INDRA SEN; RAM, Jagjiwan SEN; Singh, Kedar


The effective thermal conductivity (λe), effective thermal diffusivity (χe) and specific heat per unit volume (ρCp) of twin pellets of Se80In20-xPbx (x = 0, 5, 10 and 15) glasses have been measured at room temperature by using transient plane source (TPS) technique. All three parameters have been varied with Pb content and show reversal trend for 5 at. wt.% of Pb. This reversal trend can be explained on the basis of carrier type reversal as a consequence of unpinning of the Fermi level due to incorporation of Pb in Se-In glassy system.


Thermal conductivity; Thermal diffusivity; Fermi level; Carrier type reversal

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