Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The power conversion efficiency of thin film solar cells can be optimized by increasing the amount of light absorbed in the active layer of the cell, using plasmonic light trapping schemes. This strategy enables the utilization of absorber materials with short carrier diffusion length such as those used in common organic solar cells architectures. Recently, plasmonic absorbers that take advantage of coupling of light with tightly confined field of surface plasmons have been demonstrated to enhance the efficiency. Plasmonic light absorbers with localized as well as propagating surface plasmons were investigated, however, they typically operate only at narrow wavelength bands due to the resonant coupling of light to these waves. This paper presents a novel plasmonic structure for absorbing light over broad range of wavelengths and angles of incidence. It is based on a corrugated metallic grating with multiple superimposed periodical modulations for diffraction coupling of light to surface plasmons. This approach combines the advantages of regular periodic and random structures as it allows for strong as well as broadband coupling of light to surface plasmon waves. In order to demonstrate this concept, a multi-diffractive structure was sequentially recorded by laser interference lithography into a photoresist, copied into a UV cross-linkable polymer, and subsequently coated by aluminum and a thin standard polymer-based photovoltaic active material layer (poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C61 (PCMB)). Experiments and numerical simulations were carried out in order to design a three-diffraction crossed grating corrugation for plasmonic extending of the absorption band of the P3HT:PCBM into near infrared part of spectrum. The work demonstrates that this structure enhances the absorption in the P3HT:PCBM by a factor of 2.9 in the spectral window 600-750 nm where it is inherently weakly absorbing. Over the whole visible / NIR part of spectrum 400-750 nm the number absorbed photons in P3HT:PCBM is increased by 28 %.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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