Carrier type reversal in Pb modified Se80In20 semiconducting glassy alloys

Abstract

The effective thermal conductivity (λ_e), effective thermal diffusivity (χ_e) and specific heat per unit volume (ρC_p) of twin pellets of Se₈₀In_20-xPb_x (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.