Polypyridyl Ru(II)-sensitizers with extended π-system enhances the performance of dye sensitized solar cells |
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| Authors: | Malapaka Chandrasekharam Ganugula Rajkumar Chikkam Srinivasa Rao Thogiti Suresh Marri Anil Reddy Paidi Yella Reddy Yarasi Soujanya B Takeru Yum Jun-Ho Mahammad Khaja Nazeeruddin Michael Graetzel |
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| Affiliation: | 1. Inorganic & Physical Chemistry Division, Nanomaterials Laboratory, Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500607, India;2. Molecular Modelling Group, Nanomaterials Laboratory, Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500607, India;3. Aisin Cosmos R&D Co. Ltd, Nanomaterials Laboratory, Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500607, India;4. Laboratory of Photonics and Interfaces, Swiss Federal Institute of Technology (EPFL), Lausanne CH-1015, Switzerland |
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| Abstract: | New polypyridyl ruthenium(II) complexes “cis-Ru(4,4′-dimesityl-2,2′-bipyridine) (Ln) (NCS)2 H102” and “cis-Ru(4,4′-bis(2,3,6-tri-isopropylphenyl)-2,2′-bipyridine) (Ln) (NCS)2 H105”, where Ln = 4,4′-dicarboxylic acid-2,2′-bipyridine; were synthesized and successfully applied to sensitization of nano-crystalline TiO2 based solar cells (DSSCs). The DSSCs of H102 and H105 fabricated from 0.16 cm2 TiO2 electrodes exhibited broader comparable photocurrent action spectra with almost identical solar-to-electrical energy conversion efficiency (η) as compared to N719 sensitizer. The incident photon-to-current conversion efficiency (IPCE) values of 98% and 95% were obtained for H102 and H105 sensitizers respectively. Under 1 sun condition, η-values of 8.39% (short-circuit photocurrent (JSC) = 16.4 mA/cm2, open-circuit photo voltage (VOC) = 692 mV, fill factor = 0.734), 8.76% (JSC = 16.3 mA/cm2, VOC = 735 mV, fill factor = 0.734) and 9.12% (JSC = 16.1 mA/cm2, VOC = 745 mV, fill factor = 0.753) were obtained for H102, H105 and N719 sensitizers respectively. |
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