Photoelectric properties of the n-SnSSe-p-InSe heterojunctions were investigated. A special feature of these structures is the use of an SnS2- xSex alloy (x = 0.5) as a wide-bandgap window material, which makes it possible to shift a short-wavelength threshold (lying in the 0.8-1.0 mu m range) of the heterojunction photosensitivity band. It is demonstrated that high-quality p-n heterojunctions can be fabricated from layered crystals joined to make an optical contact. (C) 2000 MAIK "Nauka/Interperiodica".