The photoelectric characteristics of Pb 0.975 Sn 0.025 Se solid solution films prepared by the hydro chemical codeposition of PbSe and SnSe with the subsequent heat treatment in air at 573-700 K have been investigated. The thermal and optical band gaps, the temperature coefficient of the optical band gap, the dark resistance, the volt watt sensitivity, and the range of spectral sensitivity have been determined in the temper ature range of 220-300 K. It has been found that, after heat treatment below 573 K, the films of the Pb 0.975 Sn 0.025 Se solid solutions possess metallic conductivity, while being heat treated at elevated tempera tures, they become semiconductors with p type conductivity. The composition of the solid solution is inde pendent of the heat treatment temperature; it is formed during deposition.
The mode and conditions of thermal sensitization in the temperature range 648-698K lead selenide films deposited from ethylendiamine acetate system were determined. The effect of heat treatment on the morphology and properties of photosensitive chemically deposited films of PbSe was showed. It is concluded that the results obtained by hydrochemical synthesis of nanostructed highly sensitive to infrared range radiation layer of lead selenide provide performance on the level of best foreign analogues.
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