Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Hybrid Photovoltaics is an interesting technology with the potential of putting together the strengths organic PV with those of Dye Sensitized Solar Cells. Performance of the hybrid devices are strongly governed by the device morphology, which itself is regimentated by the inorganic photoanode architecture. The ideal structure would consist of interpenetrated network of organic-inorganic with the highest specific surface in order to maximize the interfacial area between organic-inorganic materials while keeping donor domains in exciton diffusion length range. Moreover, suitable photoanode design can improve charge mobility of organic films. Here we present a novel architecture based on a forest of hierarchical nanostructures grown by Pulsed Laser Deposition. The structural characteristics of these nanostructures can be tuned by a proper choice of deposition conditions. For an optimized device based on hierarchical TiO2 films in terms of film density, film thickness, and also spin-coated P3HT molecular weight, ann average power conversion efficiency of 0.8%, exceeding 1% for the champion device, under air mass (AM) 1.5 illumination has been realized for devices 800 nm thick, deposited in 7 Pa of O2.This result represents significant increase with respect to an optimized device obtained with a standard mesoporous titania photoanode (champion =0.43%). This is attributed to the peculiar optical properties of the novel acceptor phase in maximizing light absorption by enhanced scattering explained by diffused transmittance, close-to-optimal interpenetrating morphology as confirmed by quantitative electron tomography, and increased charge mobility in the P3HT due to better crystallization inside the hierarchical nanostructure that is supported by XRD analysis and verified by nanosecond measurements.
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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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