Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Dye-sensitized solar cells (DSSCs) have attracted great deal of attentions since the pioneering work of Graetzel in 1991 towards cheap harvesting of immense solar energy. Commercial implementation of DSSCs undoubtedly needs not only long-term stability but also further enhancement in the photoconversion efficiency (PCE) by panchromatic photon harvesting utilizing efficient NIR dyes. Best PCE in the DSSCs has been demonstrated using cobalt electrolytes owing to higher open circuit voltage (Voc). In spite of this attractive aspect of cobalt electrolytes, large charge recombination owing to their bulky size and slow diffusion needs strict surface passivation and judicious molecular design of novel sensitizers. Surface passivation with metal oxides and introduction of long alkyl chains in sensitizers have been widely used for high efficiency DSSCs using cobalt electrolytes. In this work, we have designed novel unsymmetrical squaraine dyes (SQ 121, SQ 123 and SQ 126) bearing long alkyl chains along with the introduction of positively charged moieties in the alkyl side chain. The main idea for our design based on the hypothesis that it is expected to repel the positively charged cobalt ion of electrolyte towards their direct contact with negatively charged TiO2 surface inhibiting the back electron transfer. Newly proposed dye molecules were successfully synthesized and subjected to the photophysical characterizations. These dyes exhibited a intense light absorption in the far red wavelength region with molar extinction coefficient >105 dm3 mol-1 cm-1. In solution, their absorption maximum varies from 644 nm to 662 nm with very small Stokes shift of 16-24 nm. On the other hand, upon adsorption of these dyes on thin films of mesoporous TiO2, there was a spectral broadening in the absorption spectra with an offset nearing 750 nm. Details about the dye design along with their photophysical characterizations will be discussed during my poster presentaion.
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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.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.