Abstract
Structural, optical and electrical analyses of flash evaporated lead-mercury telluride films indicate that under appropriate conditions of growth ternary Pb 1− x Hg x Te compounds are formed in the single phase crystalline films. Optical band gaps of the crystalline films, grown on substrates at temperatures ( Ts) of 25 and 100°C, are observed to decrease with increase in mercury concentration in the films. The optical gap decreases between 0.27 and 0.14 eV in the 0.07 ⩽ x⩽ 0.50 Ts of 25°C films and between 0.23 and 0.09 eV in the Ts of 100°C 0.07 ⩽ x⩽ 0.93 films. Activation energy values, calculated from electrical conductivity measurements, indicate that between 350 and 500 K, the conduction is mainly due to thermally generated charge carriers, whereas impurity conduction dominates at temperatures <250K. All crystalline films are observed to be photoconducting.
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