Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Dye-sensitised solar cells (DSSCs) have attracted significant interest as light-weight, flexible, coloured, portable or indoor, alternatives to conventional photovoltaic technologies. Ruthenium complexes work as sensitisers with standard liquid redox electrolyte, giving efficiency up to 11.9%, however several challenges limit their development for large scale applications including material costs, purification and environmental impacts. Metal-free organic sensitisers with high extinction coefficients have been developed, suitable for both liquid-eletrolyte and solid-state DSSCs. The overwhelming trend in designing these dyes is based on a donor - π spacer - acceptor (D-π-A) architecture. The donor and the π spacer part contain the HOMO of the dye while the LUMO is distributed on the acceptor part and the anchoring group. Recent work in our group however, on a ‘donor-free’ sensitiser (5T), compared with the analogous ‘donor- π-acceptor’ sensitiser showed that without an electron donor group, a significantly higher open-circuit voltage (VOC) was achieved while the short-circuit current (JSC) remained the same [1]. This resulted in a much higher over-all efficiency. Solid-state devices using 5T as the sensitiser and spiro-OMeTAD as the hole-transport material gave an efficiency of 4.4% while the ones using the related D-π-A MK2 as the sensitiser gave only 2.8%. Following this work, we have designed, synthesised, characterised and tested further "donor-free" oligothiophene dyes [2], and a new design of oligo-CPDT dyes. We will report full characterisation through electrochemical, spectroscopic and computational techniques, showing versatile colour-tuning, as well as outstanding absorption coefficients up to 75000 M-1cm-1. Liquid and solid-state DSSCs devices have shown efficiencies up to around 9% and 4% respectively, and performances will be discussed in terms of the dye structures.
References: [1] Antonio Abate, Miquel Planells, Derek J. Hollman, Samuel D. Stranks, Annamaria Petrozza, Ajay R. Srimath Kandada, Yana Vaynzof, Sandeep K. Pathak, Neil Robertson, Henry J. Snaith, Organic donor-free dye for efficient solid-state solar cells, Advanced Energy Materials, 2014, 4, 1400116 [2] Yue Hu, Aruna Ivaturi, Miquel Planells, Chiara L. Boldrini , Alessio Orbelli Biroli, Neil Robertson, ‘Donor-free’ oligo(3-hexylthiophene) dyes for efficient dye-sensitized solar cells, J. Mater. Chem. A, 2016, 4, 2509
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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.
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