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li-i the workare studied structural, electrical and optical properties of film heterojunctions p-Pb1SnTe -n-PbTe obtained by condensation of molecular beams in vacuum -1 06 mm mercury pressure. it is determined that diffusion fringes intensity on diffraction patterns are different depending on thickness of films (d) and temperature of films growing (Tf). The intensity of diffusion fringes also depends on survey temperature (Ta). The correlation between intensity of diffusion fringes on electron diffraction patterns and photosensitivity of heterojunctions Pb1SnTe -PbTe is found.