Synthesis and characterization of an organic sensitizer for exploring a new co-sensitization system in dye-sensitized solar cells
Diana Meza-Rojas a, Peter J. Holliman a, Christopher Kershaw a, Rosie Anthony a, Eurig Jones a, Leo Furnell a, Arthur Connell a, Ian Matthews a
a College of Engineering, Swansea University, Bay Campus, Swansea SA1 8EN UK
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Diana Meza-Rojas, 236
Publication date: 11th February 2019

Herein, we report the synthesis of a yellow dye. The molecule, which we denote YD, consists of a donor-p-acceptor (triarylamine-vinyl-benzyl) arrangement and it was obtained through Heck coupling reaction in a good overall yield. The molecular structure was confirmed by 1H, 13C, DEPT135 and HSQC NMR techniques and mass spectrometry. The use of J-resolved spectroscopy was a method to unambiguously identify the E isomer in the structure. The optical properties were investigated using UV-Vis absorption and fluorescence spectroscopy. The influence of organic solvents with diverse polarities on the optical characterization has been studied. A hypsochromic shift was observed when passing from chloroform to methanol, as a result of the increase in the polarity. The YD molecule exhibits an absorption peak in the region of 290-430 nm. The fluorescence maximum is in the region of 480-500 nm. The emission spectra show that the molecule has relatively large Stokes shifts of around 70-100 nm suggesting changes in geometrical configuration of the molecule upon excitation. A further investigation on the yellow dye is being continued in our laboratory mainly focused on the application of the material in solar cell devices. We are confident that this will lead to an improvement in the device efficiency and a key approach to achieve this is through the co-sensitization.

We gratefully acknowledge funding from EPSRC for DMR and RA (EP/P030068/1) and Swansea University EPSRC National Mass Spectrometry Service Centre.

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