NEW NIR-ABSORBING CROCONAINE DYES FOR DYE-SENSITIZED SOLAR CELL APPLICATIONS
Christopher Kershaw a, Peter Holliman a, Eurig Jones a, Diana Meza-Rojas a, Arthur Connell a, Rosie Anthony a, Leo Furnell 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, Christopher Kershaw, 247
Publication date: 11th February 2019

The efficiencies of DSC’s have been increasing recently, with a better understanding of dye processing and massive improvements with co-sensitisation has led to efficiencies greater than 14 %.1

Previous work has shown DSC’s to perform well in the visible light range however they fall short in the NIR which means a large number of photons are not absorbed and therefore wasted. Dyes such as cyanines2 and squaraines3 (as well as many others) have been used to absorb light in the NIR. However, cyanine dyes tend to aggregate and squaraines only have a narrow absorption band in the NIR region which still leaves many photons unharvested.4

One potential dye family that could be used to absorb in the NIR are croconaine dyes.5 Croconaines are identical to squaraines except they have a five membered ring as their core (compared to the four membered ring of squaraines). This extra carbon pushes the absorption of croconaines much further into the NIR most around 800-900 nm with some as high as 1000 nm)5 without compromising on their synthetic versatility and ease of synthesis. Croconaines have been widely published in the literature. However, only one report has been found of their use in a PV device.6 We have synthesised a croconaine dye and for the first time explored their potential as a NIR sensitizer for DSC applications. We hope that this will pave the way for a new wave of high efficiency NIR absorbing DSC devices.

Fig. 1: (Left) A blue coloured squaraine dye compared to its purple croconaine equivalent (right)

We gratefully acknowledge funding provided by from the Welsh Government for Sêr Cymru (PJH), the European Union and Welsh Government for Sparc II (CK, LF, RA), and from EPSRC EP/P030068/1 (DMR) and EP/M015254/1 (AC, EWJ).

© Fundació Scito
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