The general concepts and provisions of ecological tourism are given in the article, natural-recreational potential of Ukraine, a problem and prospect of development national ecotourism, its role in ecological-safe of development are considered.

A review on the analysis of characteristics of dye-sensitized solar cells (DSSC) is provided. DSSC design, materials that are used for the manufacture of functional layers and the characteristics of elements depending on their properties are analyzed. The basic disadvantages DSSC, the factors leading to their appearance, as well as solutions to eliminate or reduce the impact of these factors are revealed.