Abstract
The carrier type reversal (CTR) from p- to n-type in semiconducting chalcogenide glasses is an important and a long standing problem in glass science. Ge–Se glasses exhibit CTR when the metallic elements Bi and Pb are added. For example, bulk Ge42−xSe58Pbx glasses exhibit CTR around 8–9at.% of Pb. These glasses have been prepared by melt quenching method. Glass transition temperature (Tg), Specific heat change between the liquid and the glassy states (ΔCp) at Tg and the nonreversing heat flow (ΔHnr) measured by modulated differential scanning calorimetry exhibit anomalies at 9at.% of Pb. These observed anomalies are interpreted on the basis of the nano scale phase separation occurring in these glasses.
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