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• W159077870 abstract "The aim of this work is to investigate the role of optical resonances supported in different layouts of solar cells integrating metallic plasmonic gratings. A simplified ideal model was first developed in order to clarify the role and the potentialities that all the optical resonances involved in such structures have in remodulating light absorption. In a further analysis, a global optimization of both geometrical parameters of the grating (period, thickness, slit width) as well as the dielectric environment has been performed, considering different solar cell layouts, in order to obtain a gain in absorption over the widest bandwidth of solar spectrum. Following the simulation and optimization results, a nanofabrication process for the integration of metal nanostructures on top of large area c-Si solar cells has been designed. A new Laser Interference Lithography system, useful for the fabrication of large area plasmonic structures has been designed, constructed and tested. Several processes have been designed and performed and new materials have been also developed (e.g. Hybrid Organic-Inorganic solgel sinusoidal gratings). System performances are still growing toward the control of the full set of geometric parameters of the structures that can be fabricated. After nanofabrication, performances of solar cells integrating plasmonic crystals have been verified by electro-optic characterizations. Polarization resolved Specular Reflectance measurements of patterned solar cell samples were performed and results validate the model. Figures of merit of devices integrating plasmonic crystals, current density (JV) as well as External Quantum Efficiency (EQE), have been also measured. JV characteristics show a significant improvement in conversion efficiency for cells integrating the Ag nanostructures compared to flat reference cells. Such improvement is mainly due to the enhancement in short circuit current due to the light trapping effect provided by the plasmonic crystals. The EQE spectra of cells with gratings show an enhancement in near infra-red response for TM polarization, as expected from optical simulations, and also an unexpected measured improved absorption in the visible. The latter is a further indication of effectiveness of plasmonic nanostructures in light harvesting." @default.
• W159077870 created "2016-06-24" @default.
• W159077870 creator A5064626470 @default.
• W159077870 date "2012-01-30" @default.
• W159077870 modified "2023-09-27" @default.
• W159077870 title "Plasmonic Nanostructures for Enhanced Photovoltaics" @default.
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