Abstract

Here we discuss the use in solar cells of graphene grown by chemical vapor deposition (CVD) and ofplasmonic gold nanoparticles (Au NPs) deposited by sputtering. The Au NPs have been coupled with a-Siheterojunction solar cells, with an organic active layer used in organic photovoltaics, and with graphene.Extensive characterization of those three systems by the optical technique of spectroscopic ellipsometry,which is suitable to monitor and analyze the plasmon resonance of the Au NPs, by the microstructuraltechnique of Raman spectroscopy, which is suitable to analyze graphene properties and doping, and byatomic force microscopy has been carried out. Those techniques highlighted interactions between AuNPs and silicon, polymer and graphene, which lead to variation in the plasmon resonance of Au NPsand consequently in the characteristics of the Au NPs/Si, Au NPs/polymer and Au NPs/graphene hybrids.Specifically, we found that an optimal size and density of Au NPs are able to enhance the efficiency of c-Si/a-Si heterojunction solar cells and that exceeding with Au NPs size and density causes device shortcutbecause of interface interdiffusion between silicon and gold. To discuss organic photovoltaics, Au NPshave been combined with an electro-donating conjugated polymer, the poly[1,4bis(2-thienyl)-2,5-bis-(2-ethyl-hexyloxyphenylenes)]. We found that there is a strong correlation between the thickness andmorphology of the organic active layer, which affects the energy and amplitude of the Au NPs plasmonresonance. Finally, Au NPs have been deposited on graphene. We found that Au NPs show the plasmon resonancein the region where graphene is transparent and also yield p-type doping of graphene decreasingits sheet resistance.

Autore Pugliese

• Bianco Giuseppe Valerio , Losurdo Maria , Giangregorio Maria Michela

Tutti gli autori

• M.M.Giangregorio; M.Losurdo; G.V.Bianco; E.Dilonardo; P.Capezzuto; G.Bruno

Titolo volume/Rivista

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Anno di pubblicazione

2013

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ISBN

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Numero di citazioni Wos

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Settori ERC

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