Metallic nanoparticles (NPs), sustaining localized surface plasmon resonances, are currently of great interest for enhancing light trapping in thin film solar cells. To be directly applicable in the photovoltaic industry, the NPs fabrication needs to be simple, reliable, low-cost and scalable. As such, self-assembly processes are most commonly used, and Ag is the preferred material, due to its high radiative efficiency and low imaginary permittivity. After exploring the correlation between structural and optical properties of Ag NPs fabricated by solid- state dewetting process on various substrates, we identified the fabrication conditions in which desirable NPs are obtained, but we also evidenced unexpectedly high parasitic absorption, main obstacle for photovoltaics. Thus, we introduced a novel spectroscopic method which enables the quantification of absorption enhancement and parasitic losses and demonstrated that the optical losses in the NPs are insignificant in the wavelength range of interest, while the NPs provides up to 90% useful absorption enhancement, which can be attributed to both the random front surface texture, originated from the conformal growth of the material over the NPs and to the scattering of light by the plasmonic NPs. Our optimized plasmon-enhanced thin film solar cell shows a pronounced broadband enhancement of external quantum efficiency and remarkably high short circuit current density in comparison to those reported in the literature.
|Titolo:||Plasmonic nanostructures for light trapping in photovoltaics|
|Citazione:||Morawiec, S., & Crupi, I.Plasmonic nanostructures for light trapping in photovoltaics.|
|Appare nelle tipologie:||6.2 Abstract non pubblicato|