Design of Plasmonic Nanoparticles for Efficient Subwavelength Light Trapping

Published:2012-11-25 09:11:00 From:Editor hits：

Recent research into the field of plasmonic photovoltaics has found an attractive approach that uses forward scattering from metallic nanostructures deposited on top of thin-film solar cells to improve light trapping and energy conversion efficiency of the cells [1]. Due to metals’ ability to form high surface charges, specially designed metallic nanostructures provide strong subwavelength scattering of the light that can significantly improve the light trapping of thin-film cells through coupling with the semiconductor waveguide modes [2–5]. Besides efficient scattering, the surface charges also collectively oscillates and create a set of resonances known as surface plasmons [6]. Depending on the metal and geometry of the structure, the surface plasmon resonances can lie in different parts of the spectrum. Thus, with respect to the sunlight, all metallic nanostructures can be divided into two groups: resonant and nonresonant structures. For the resonant group, surface plasmons lie in the visible range and can interact with the sunlight in a resonant manner. On the other hand, surface plasmons of the nonresonant structures lie outside of the visible range and cannot contribute much to the scattering of the sunlight. Despite this difference, both groups may provide very efficient scattering of the sunlight and can significantly improve subwavelength light trapping of thin-film solar cells through proper

design of these nanostructures.

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Design of Plasmonic Nanoparticles for Efficient Subwavelength Light Trapping