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Transformations in a nanosized bismuth layer are studied by means of optical spectroscopy, microscopy, and gravimetry, depending on the thickness (d = 3-120 nm), thermal treatment temperature (T = 373-673 K) and time (τ] = 0.05-2500 min). It is established that, depending on the initial thickness of the bismuth films and the thermal treatment temperature, the kinetic curves of the degree of transformation are satisfactorily described within linear, inverse logarithmic, cubic, and logarithmic laws. The contact poten tial difference for the Bi, Bi 2 O 3 films and the photo electromotive force for the Bi-Bi 2 O 3 systems is mea sured. An energy band diagram for the Bi⎯Bi 2 O 3 systems is constructed. A model for the thermal transfor mation of Bi films that includes the stage of oxygen adsorption, the redistribution of charge carriers in the BiBi 2 O 3 contact field, and the formation of bismuth(III) oxide is proposed.

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