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Investigations into structure-property relationships of novel Ru(II) dyes with N,N′-Diethyl group in ancillary ligand for dye-sensitized solar cells.
- Source :
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Dyes & Pigments . Dec2019, Vol. 171, pN.PAG-N.PAG. 1p. - Publication Year :
- 2019
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Abstract
- Structure-property relationships of four novel bipyridyl Ru(II) complexes, denoted as SD-22, SD-24, SD-26 and SD-28, are reported herein. The molecular structures of all four photosensitizers were confirmed using FT-IR, 1H NMR and mass spectrometry. Photovoltaic characteristics of the photosensitizers were evaluated under 1.5 a.m. standard illumination condition, in presence of deoxycholic acid as co-adsorbent, and subsequently compared to the performance of the benchmark, Z907. SD-22 showed an IPCE of 52% and 50% at 440 nm and 550 nm, respectively, a short-circuit photocurrent density (J SC) of 17.37 mA cm−2, open-circuit photovoltage (V OC) of 0.63 V and fill factor (FF) of 0.66, producing an overall conversion efficiency (η) of 7.31%, which outperformed Z907 (7.02%) under the same experimental device conditions. The η of the other photosensitizers is in the following order: SD-22 > SD-28 > SD-26 > SD-24. Photosensitizer SD-22 has N, N′ -dialkyl group attached to a benzene ring while SD-24 has N,N′-dialkyl without a benzene ring. The extended conjugation in SD-22 translated into higher overall solar-to-electric conversion efficiency. Substitution of dialkylamino-based ancillary ligands of Ru(II) dyes SD-26 and SD-28 with –OCH 3 and –OC 6 H 13 also demonstrated that the photovoltaic performance of polypyridyl ruthenium photosensitizers is a function of the donating power of ancillary ligands as well as the steric effect of alkoxy auxochromes at – ortho position. • Structure-property relationship of four bipyridyl Ru(II) complexes with N , N′ -diethyl group in ancillary ligand was studied. • Highlights the effect of extended conjugation on the photocurrent and photovoltage in DSSC. • SD-22 outperformed the rest of the dyes in photovoltaic performance due to better light-harvesting ability. • Enhancement of the photovoltaic performance in SD-22 is ascribed to the presence of aromatic ring and smaller alkyl chains. • Molecular modulations of electron donating N , N′ -diethyl based Ru(II) dyes was presented to further analyze the properties. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01437208
- Volume :
- 171
- Database :
- Academic Search Index
- Journal :
- Dyes & Pigments
- Publication Type :
- Academic Journal
- Accession number :
- 138153806
- Full Text :
- https://doi.org/10.1016/j.dyepig.2019.107754