Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
The development of novel photosensitizers with very high molar extinction coefficients and broad absorption spectra to enhance the light harvesting efficiency providing high PCEs for solid state dye sensitized solar cells (ssDSCs) and dye-sensitized solar cell (DSC) devices is a main target for improvement. In this work, a novel organic yellow-coloured dye termed YD, consists of a donor-pi-acceptor (triarylamine-vinyl-benzyl) arrangement, was designed and synthesized through Heck coupling reaction in a good overall yield for ssDSCs and DSCs applications. The efficiency of 0.75% based solid-state devices has been obtained, with 2,2′,7,7′-tetrakis (N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) as hole transporting material with an open-circuit potential (VOC) of 710 mV and short-circuit current density (JSC) of 1.67 mA/cm2, under simulated AM 1.5G illumination (100 mW/cm2). The dye YD demonstrates a power-conversion efficiency of 2.6% for liquid-electrolyte dye-sensitized solar cells and 3.2% for cells that are co-sensitized by another metal-free dye, SQ2. The effects of molecular structure on optical and electrochemical properties and photovoltaic performance of the sensitizer have been systematically researched and will be presented in this poster. Computer simulations using DFT indicate that the HOMO is predominantly located at the electron-rich-triarylamine donor group attached to the conjugated spacer. In contrast, the LUMO is located at electron-poor carboxylate acceptor group to enhance electron injection from the excited state of the dye into the TiO2 photo-anode.
We gratefully acknowledge funding from the EU European Regional Development Fund (ERDF) for the SPARC II project.
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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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