Efficient and stable organic yellow-coloured dye for dye-sensitized solar cells and solid-state dye-sensitized solar cells
Diana Meza Rojas a, Peter Holliman a, Chris Kershaw a, Eurig Jones a, Dawn Geatches b, Kakali Sen b, Ya-Wen Hsiao b, Joe Bater-Davies a, Benjamin Harrison a, Josh Barlow a
a College of Engineering, Swansea University, Bay Campus, Swansea SA1 8EN UK
b Scientific Computing Department, STFC Daresbury Laboratory, Daresbury, Warrington, UK
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Diana Meza Rojas, 216
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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