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The perspective of use of radiation-stable semiconductor compounds with loose crystal structures for development of photovoltaic converters is discussed. Use of these semiconductors promises to get low cost solar cells with extremely high radiation stability. A theoretical possibility of creation of photoconverters based on semiconductors of this type is presented. Thin-film heterostructures of intrinsic semiconductors with thickness of the screening length order are shown to have properties, similar to conventional p-n heterojunctions, including photoconverters.