Resonant and nonresonant plasmonic nanoparticle enhancement for thin-film silicon solar cells.
ABSTRACT This paper investigates the influence of resonant and nonresonant plasmonic nanostructures, such as arrays of silver and aluminum nanoparticles in the forward scattering configuration, on the optical absorption in a thin-film amorphous silicon solar cell. It is demonstrated that nonresonant coupling of the incident sunlight with aluminum nanoparticles results in higher optical absorption in the photoactive region than resonant coupling with silver nanoparticle arrays. In addition, aluminum nanoparticles are shown to maintain a net positive enhancement of the optical absorption in amorphous silicon, as compared to a negative effect by silver nanoparticles, when the nanoparticles are oxidized.
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ABSTRACT: A silicon nanowire (SiNW) array was embedded into a polydimethylsiloxane matrix to fabricate a flexible thin film solar cell in which a rugged metallic back surface was formed at the bottom. Superior light scattering of the randomly arrayed SiNWs significantly improved the light absorptance in a short wavelength region (λ b 700 nm). The rugged morphology of metallic back surface excited the surface plasmon polaritons (SPPs) along the interface between the metal and Si, which showed a plasmonic potential to enhance light absorption in a long wavelength region (λ N 700 nm). This feature was attributed to the three major routes for light trapping: back reflection, SPP resonance, and SPP scattering. This nanowire thin film showing the rugged back surface yielded the light absorption of ~92.6% using only ~5% of silicon required for conventional crystalline solar cells.Thin Solid Films 09/2014; 570:75-80. DOI:10.1016/j.tsf.2014.09.018 · 1.87 Impact Factor
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ABSTRACT: In this paper, a novel structure is proposed to enhance the absorption of light in thin-film solar cells by surface plasmons excited on metallic nano-rods. The excitation of surface plasmons on these nano-rods that are implemented in amorphous hydrogenated silicon is realized by a two-dimensional array of metallic nanoparticles. This array, which consists of nonresonant plasmonic nanoparticles, can be mounted on the anti-reflection coating of the solar cells.Electrical Engineering (ICEE), 2013 21st Iranian Conference on; 01/2013
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ABSTRACT: Periodic nanostructures have been widely used on emerging nano-products such as plasmonic solar cell and nano-optics. However, lack of cost-effective fabrication techniques has become the bottleneck for commercialization of these nano-products. In this work, we develop a scale up approach to fabricate high-precision nanostructures in large area. In this method, a nano-scale single crystal diamond (SCD) tool is produced by focused ion beam (FIB) machining. The nano SCD tool is then further applied to cut periodic nanostructures using single-point diamond turning (SPDT). A divergence compensation method and surface topography generation model forms a deterministic FIB fabrication approach. It has been used to generate four periods of the required periodic nano-grating structures (with a minimal dimension of 150 nm) on a normal SCD tool tip and achieves 10 nm form accuracy. The contribution of the beam tail effect has also been evaluated by using the surface topography simulation method. The fabricated diamond tool is then applied to obtain nano-grating on an electroless nickel substrate in a total area of 5 × 2 mm2 through SPDT. The whole SPDT machine process only takes 2 min (with a material removal rate up to 1.8 × 104 μm3 s−1). Due to the elastic recovery that occurred upon the workpiece material, the practical cutting width is 13 nm smaller than the tool tip. The machining trial shows it is very promising to apply this scale up nanofabrication approach for commercialization of nano-products which possess period nanostructures.Journal of Micromechanics and Microengineering 09/2012; 22(11):115014. DOI:10.1088/0960-1317/22/11/115014 · 1.73 Impact Factor