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Solar Cells New Aspects and Solutions Part 12

Tham khảo tài liệu 'solar cells new aspects and solutions part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 376 Solar Cells - New Aspects and Solutions 4.8 Antenna processes in plants Let us leave the discussion of technological matters relating to the manipulation of antenna processes aside for the time being. We will devote a subsequent publication to this subject. Let us only remark here that the conversion of solar energy involving the participation of antenna molecules figures in the description of photosynthesis in biology. Every chlorophyll molecule in plant cells which is a direct convertor of solar energy is surrounded by a complex of 250400 pigment molecules Raven et al. 1999 . The thermodynamic aspects of photosynthesis in plants were studied in Wuerfel 2005 Landsberg 1977 yet the idea of antenna for solar cells was not proposed. We hope that the notions of the antenna and working states of an absorber particles will make it possible to attain very high efficiencies of the radiant energy convertors especially in those cases when solar radiation is not powerful enough to make solar cells work efficiently yet suffices to drive photosynthesis in plants. 4.9 Conclusion This leads us to conclude that reemission of radiant energy by absorbent particles can be considered a quasi-static process. We can therefore hope that the concept of an antenna process which is photon absorption and generation can be used to find methods for attaining the efficiency of solar energy conversion close to the limiting efficiency without invoking band theory concepts. 5. Thermodynamic scale of the efficiency of chemical action of solar radiation Radiant energy conversion has a limit efficiency in natural processes. This efficiency is lower in solar biological and chemical reactors. With the thermodynamic scale of efficiency of chemical action of solar radiation we will be able to compare the efficiency of natural processes and different reactors and estimate their commercial advantages. Such a scale is absent in the well_known thermodynamic descriptions of the solar energy conversion .