Transport properties of amorphous Se80-xTE20Pbx (0<x<2) thin films

Maninder Singh Kamboj; R. Thangaraj

doi:10.1117/12.481297

13 November 2002 Transport properties of amorphous Se_80-xTE₂₀Pb_x (0

Maninder Singh Kamboj, R. Thangaraj

Proceedings Volume 4934, Smart Materials II; (2002) https://doi.org/10.1117/12.481297
Event: SPIE's International Symposium on Smart Materials, Nano-, and Micro- Smart Systems, 2002, Melbourne, Australia

Abstract

Thin films of Se_80-xTe₂₀Pb_x (0 < x < 2) glassy semiconductors have been prepared by thermal evaporation of bulk material of the above composition prepared by melt quenching technique. The glass transition temperature "T_g", the peak crystallization temperature "T_p" and the melting temperature "T_m" of the bulk samples have been estimated from the Differential Scanning Calorimetry (DSC) data. The DSC studies were performed at a heating rate of 10 deg/min. It has been found that "T_g" initially decreases with small addition of Pb (x = 0.6), however its value increases with further addition of Pb (x > 0.6). This indicates that the addition of Pb (x >0.6) cross-links the already existing Se-Te chains, which in turn increases the chain length and results in the increase of T_g. The dc conductivity of the films has been measured as a function of temperature and is found to be activated in the entire temperature range. Its value increases from 10^-9 to 10^-5 (Ohm-m)^-l with the addition of Pb to Se-Te system. The dc activation energy has been found to decrease from 0.67-0.23 eV with increase in Pb content. The optical energy gap determined at room temperature is found to decrease from 1.67-1.34eV with the addition of lead to the Se-Te matrix. The results are explained on the basis of enhanced valence band tailing when Pb is incorporated into the Se- Te system.

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Maninder Singh Kamboj and R. Thangaraj "Transport properties of amorphous Se_80-xTE₂₀Pb_x (0https://doi.org/10.1117/12.481297

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KEYWORDS

Lead

Tellurium

Selenium

Thin films

Glasses

Temperature metrology

Crystals

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