Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
In recent years, there has been a swift increase of research activity in both pure organic and transition metal based materials in making cost effective, third-generation photovoltaics, namely: dye sensitized solar cells (DSCs). Among these studies, Ru(II) metal based materials are considered to be the best sensitizers, in view of their efficiency and lifespan recorded. Conversion efficiency of over 11 % as well as suitable lifespan under higher temperature light socking studies were realized using either functionalized N719 (cf. Z907 and etc.) or N749, coupled with the traditional iodide/triiodide electrolyte. In 2009, report by Grätzel on the performance of a distinctive thiocyanate-free Ru(II) sensitizer, namely: YE05, franked with phenylpyridinato cyclometalated and two dicarboxy-2,2-bipyridine anchors. Recently, other systematic designs that devoid of thiocyanate were also achieved upon employment of either bidentate or tridentate azolate-containing chelates (c.f. TFRS-2 and TF-2), for which the electron deficient azolate fragments functioned as pi-acceptor to increase the ground state oxidation potential and rendering sufficient driving force for rapid dye-regeneration. We intended to use this opportunity to talk about these Ru(II) metal complexes and the associated DSC devices. Interestingly, the azolate-based Ru(II) sensitizers provide access to several DSC devices, with conversion efficiencies comparable to the best thiocyanate-containing Ru(II) sensitizers documented in literature.
Structural drawings of Ru(II) based sensitizers, e.g. YE05, TFRS-2 and TF-2, respectively.
(1) Hu, F.-C.; Wang, S.-W.; Chi, Y.; Robertson, N.; Hewat, T.; Hu, Y.; Liu, S.-H.; Chou, P.-T.; Yang, P.-F.; Lin, H.-W. Geometrical Isomerism of Ru(II) DSC Sensitizers and Effects on Photophysical Properties and Device Performances ChemPhysChem 2014, DOI: cphc.201300974. (2) Chou, C.-C.; Hu, F.-C.; Yeh, H.-H.; Wu, H.-P.; Chi, Y.; Clifford, J. N.; Palomares, E.; Liu, S.-H.; Chou, P.-T.; Lee, G.-H. Highly Efficient Dye-Sensitized Solar Cells Based on Panchromatic Ruthenium Sensitizers with Quinolinylbipyridine Anchors Angew. Chem. Int. Ed. 2014, 53, 178. (3) Wang, S.-W.; Wu, K.-L.; Ghadiri, E.; Lobello, M. G.; Ho, S.-T.; Chi, Y.; Moser, J.-E.; De Angelis, F.; Graetzel, M.; Nazeeruddin, M. K. Engineering of thiocyanate-free Ru(II) sensitizers for high efficiency dye-sensitized solar cells Chem. Sci. 2013, 4, 2423.
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