Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Dye-sensitized solar cells (DSSCs) can be considered as a promising future candidate for niche photovoltaics (PV) applications, including building-integrated PV for roofs and smart windows, as well as indoor applications. The most studied TiO2 phase with the best DSSC performance is anatase. However, the brookite phase can be considered as a promising material to fabricate high voltage DSSC. In this work, brookite and anatase were obtained from amorphous TiO2 by both acidic and basic processes. Four different nanomaterials were prepared: anatase, acidic-brookite, basic-brookite and acid-treated-basic-brookite; and 0.5cm2 solar cells sensitized with N719 have been fabricated and characterized. The transport and recombination properties of DSSCs are compared as a function of the composition, surface chemistry, and morphology. The highest current density was obtained for anatase cells (Jsc=9.8 mA/cm2), which after correction for the amount of dye adsorbed, was very similar to that obtained for acidic-brookite (6.6 mA/cm2); however, a larger voltage was obtained for the brookite cells, illustrating the promise of the material. Basic-brookite presents very low current (Jsc=0.1 mA/cm2), but this increases after an acid treatment of the films, exemplifying the effect of surface chemistry. We have performed detailed experiments using EIS and IMPS/IMVS to compare the transport and recombination kinetics for the different systems, in order to explain these results.
To scale-up these solar cells, issues such as the series resistance of entire device, related to the large substrate area and counter electrode, the redox couple diffusion resistance in the electrolyte, as well as sealing challenges, must be solved. Mini-modules >20cm2 were fabricated with a design based on rectangular strips of semiconductor/dye, separated by silver current collector lines, obtaining more than 200 mA short-circuit current and 0.7 V open circuit voltage, with total efficiency in active area up to 4.8%.
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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.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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