The Study Of Modes And The Absorption Of The Thin-film Solar Cells

The most rapid development in the field of Optics and Photonics is surfaceplasmon subwavelength optics. Take advantage of light scattering, near-fieldenhancement and the highly local surface plasma resonance of Metallic nanostructureall could enhance the light absorption and improve conversion efficiency of thin filmsolar cell Very well. The technology could not only be used in traditional silicon cell,but also thin film solar cell, Especially suitable for the light trap structure of thin filmcell, in addition it could be combined with manufacturing process of the traditionalbattery, have the commercial potential, Based on this background, this topic proposedand completed parts of research on the silicon solar cell.The combining use of VC and Matlab in this paper it reappeared the wholeprocess of the model extraction and light absorption of the thin-film solar cells, andalso make the program debug conveniently. Light absorption by thin-flm amorphousSi (a-Si) solar cells patterned with metallic nanogratings is investigated theoretically.Propagative bounded modes that include the surface plasmon polariton (SPP) andphotonic mode (PM) are extracted by RCWA from the total field to quantitativelyevaluate their contribution to the light absorption. Our results show that afterremoving the bounded modes from the total field, the residual field still contributes toa major part of the total light absorption. This proves at a quantitative level that thelight absorption of the structure is largely attributed to the residual field that iscomposed of unbounded modes arising from the grating scattering, on the contrary,the SPP and photonic modes do not play a dominant role.