Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Excitonic solar cells - including organic, hybrid organic-inorganic and dye-sensitized cells (DSCs) are promising devices for inexpensive, large-scale solar energy conversion. Currently DSC is the most stable excitonic photocell and at edge of commercialization of technology.1 Among various components of the device, the sensitizer is one of the vital component in achieving high efficiency and durability of the device. The widely used sensitizers are R(II) polypyridyl complexes with efficiency of >11%.2 However, Ru(II) complexes are expensive due to rarity of the metal in earth's crust, tedious synthetic protocols and lack of absorption in near-IR region. In this regard, porphyrins are found to be alternative based on absorption, electrochemical and thermal properties. Zinc porphyrins are having an intense Soret band at around 420 nm and two less intense Q-bands in 500-650 nm region of absorption spectra. In order to further improve optical properties of zinc porphyrins, Gratzel and co-workers have designed a porphyrin in donor-π-acceptor (D-π-A) and showed record efficiency of 13%.3 Herein the present work, we introduced a triple bond between donor and porphyrin macrocycle to further improve its optical properties that leads to efficiency of the device. The detailed synthesis, optical, electrochemical and device studies will be presented.
References
1. L. Giribabu, R. K. Kanaparthi and V. Velkannan, Chem. Rec., 2012, 12, 306–328.
2. M. K. Nazeeruddin, A. Kay, I. Rodicio, R. Humphry-Baker, E. Muller, P. Liska, N. Vlachopoulos and M. Grätzel, J. Am. Chem. Soc. 1993, 115, 6382.
3. S. Mathew, A. Yella, P. Gao, R. Humphry-Baker, B.F.E. Curchod, N. Ashari-Astani, I. Tavernelli, U. Rothlisberger, M.K. Nazeeruddin, M. . Grätzel, Nature Chem. 2014, 6, 242-247.
Acknowledgements: Authors are thanks to DST-UK ('APEX') and CSIR-TAPSUN (GAP-0366) for financial support of the work.
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