Abstract
SUMMARY Atmospheric and environmental pollution as a result of extensive fossil fuel exploitation in almost all human activities has led to some undesirable phenomena. They include global warming, the greenhouse effect, clim ate change, ozone layer depletion, and acid rain. Solar radiation is an integral part of d ifferent renewable energy resources and it is the main and continuous input variable from the pra ctically inexhaustible sun. This study details the science, research and fabric ation of solar device, capable of converting sunlight into electrical power. With all this things in mind, the paper investigates the potential of an organic dye/polymer solar conce ntrator. Organic materials are inexpensive when produced in industrial quantities, they are co mpatible with multiple fabrication techniques and they have strong optical properties, in term of absorption and re-emission of light. The first solar cell structure was a Schottk y junction. Tang (1981) introduced a planar heterojunction and increased the conversion efficie ncy up to 1% in copper phthalocyanine/ perylene derivative heterojunction solar cell. In 1 991, Hiramoto et al. (1991) developed a concept of bulk heterojunction. Xue et al . (2005) reported conversion efficiency over 5% in organic solar cells based on hybrid bulk heterojunc tion. Our study proposes a new solar device (based on rhodamine/polymethylmethacrylate). Liquid samples were obtained by dissolving rhodamine in methanol and then the absor ption spectra were registered with a spectrophotometer. The samples were stored in darkness at room temperature and then combined with the polymer in methanol solution. Further work was done in order to quantify the efficiency of this solar device. Acknowledgments. This study has been financed by the Romanian Ministry of Education and Research, National Authority for Scie ntific Research, 19N/2009 NUCLEU Program, under Project PN 09190103, „Theoretical and experimental research for realization of molecular solar concentrators with application i n the systems of renewable energy conversion”.
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