Journal ArticleDOI
Thiocyanate-Free Ru(II) Sensitizers with a 4,4′-Dicarboxyvinyl-2,2′-bipyridine Anchor for Dye-Sensitized Solar Cells
Kuan-Lin Wu,Kuan-Lin Wu,Wan-Ping Ku,Sheng-Wei Wang,Aswani Yella,Yun Chi,Shih-Hung Liu,Pi-Tai Chou,Mohammad Khaja Nazeeruddin,Michael Grätzel +9 more
TLDR
In this article, a carboxyvinyl-pyrazolate sensitizer, TFRS-11TFRS-13, was proposed for dye-sensitized solar cells.Abstract:
A new class of thiocyanate-free Ru(II) sensitizers with 4,4-dicarboxyvinyl-2,2-bipyridine anchor and two trans-oriented pyrid-2-yl pyrazolate (or triazolate) functional chromophores is synthesized, characterized, and evaluated in dye-sensitized solar cells (DSCs). Despite their enhanced red response and absorptivity when compared to the parent sensitizer TFRS-2 that possesses standard 4,4-dicarboxyl-2,2-bipyridine anchor and shows the best conversion efficiency of = 9.82%, the newly synthesized carboxyvinyl-pyrazolate sensitizers, TFRS-11TFRS-13, exhibit inferior performance characteristics in terms of short-circuit current density (JSC), open-circuit voltage (VOC), and power conversion efficiency (), the latter being recorded to be in the range 5.607.62%. The reduction in device efficiencies is attributed to a combination of poor packing of these sensitizers on the TiO2 surface and less positive ground-state oxidation potentials, which, respectively, increase charge recombination with I3 in electrolytes and impede the regeneration of sensitizers by I anions. The latter obstacle can be circumvented in part by the replacement of the pyrazolates with triazolates, forming the TFRS-14 sensitizer, which exhibits an improved JSC, VOC, and of 16.4 mAcm2, 0.77 V, and 9.02%, respectively.read more
Citations
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Journal ArticleDOI
Anchoring Groups for Dye-Sensitized Solar Cells
TL;DR: This review focuses especially on the structural aspects of these novel dye anchors for TiO2-based DSSCs, including pyridine, phosphonic acid, tetracyanate, perylene dicarboxylic acid anhydride, 2-hydroxylbenzonitrile, 8-Hydroxylquinoline, pyrsidine-N-oxide, hydroxylpyridium, and salicylic acid substituents.
Journal ArticleDOI
Highly efficient dye-sensitized solar cells: progress and future challenges
TL;DR: In this paper, the major progress of improving the energy conversion efficiency of dye-sensitized solar cells (DSCs) which may be useful for future applications is selectively reviewed, and a roadmap of possible future directions of DSCs with the challenges of how to further improve the efficiency to accelerate the progress in the commercialization of DSCs is illustrated.
Journal ArticleDOI
Metal complexes with pyridyl azolates: Design, preparation and applications
TL;DR: In this article, a review of metal complexes bearing pyridyl azolates or relevant functionality is presented, focusing on the emerging metal complexes, which show bright prospect in the energy relevant issues such as organic light emitting diodes (OLEDs) and dye sensitized solar cells (DSCs).
Journal ArticleDOI
Highly Efficient Dye‐Sensitized Solar Cells Based on Panchromatic Ruthenium Sensitizers with Quinolinylbipyridine Anchors
Chun-Cheng Chou,Fa-Chun Hu,Hsiu-Hsuan Yeh,Hsin-Pei Wu,Yun Chi,John N. Clifford,Emilio Palomares,Shih-Hung Liu,Pi-Tai Chou,Gene-Hsiang Lee +9 more
TL;DR: This 6-quinolin-8-yl-2,2'-bipyridine anchor serves as a prototype for the next generation of Ru(II) sensitizers with any tridentate ancillary and shows remarkable improvement in absorptivity across the whole UV-Vis-NIR spectral regime.
Journal ArticleDOI
Engineering of thiocyanate-free Ru(II) sensitizers for high efficiency dye-sensitized solar cells
Sheng-Wei Wang,Kuan-Lin Wu,Kuan-Lin Wu,Elham Ghadiri,Maria Grazia Lobello,Shu-Te Ho,Yun Chi,Jacques-E. Moser,Filippo De Angelis,Michael Grätzel,Mohammad Khaja Nazeeruddin +10 more
TL;DR: In this article, a series of Ru(II) metal complexes TFRS-1, -2, -4, -21, -22 and -24 with a single 4,4′-dicarboxylic acid-2,2′-bipyridine together with two functionalized pyridyl azolate ancillary ligands consisting of pyrazolate or triazolate groups were synthesized.
References
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Journal ArticleDOI
Dye-Sensitized Solar Cells
TL;DR: Dye-sensitized solar cells (DSCs) offer the possibilities to design solar cells with a large flexibility in shape, color, and transparency as mentioned in this paper, and many DSC research groups have been established around the world.
Journal ArticleDOI
Porphyrin-Sensitized Solar Cells with Cobalt (II/III)–Based Redox Electrolyte Exceed 12 Percent Efficiency
Aswani Yella,Hsuan-Wei Lee,Hoi Nok Tsao,Chenyi Yi,Aravind Kumar Chandiran,Md. K. Nazeeruddin,Eric Wei-Guang Diau,Chen-Yu Yeh,Shaik M. Zakeeruddin,Michael Grätzel +9 more
TL;DR: In this article, a Co(II/III)tris(bipyridyl)-based redox electrolyte was used in conjunction with a custom synthesized donor-π-bridge-acceptor zinc porphyrin dye as sensitizer (designated YD2-o-C8).
Journal Article
Porphyrin-sensitized solar cells with cobalt (II/III)-based redox electrolyte exceed 12 percent efficiency (vol 334, pg 629, 2011)
TL;DR: Mesoscopic solar cells that incorporate a Co(II/III)tris(bipyridyl)–based redox electrolyte in conjunction with a custom synthesized donor-π-bridge-acceptor zinc porphyrin dye as sensitizer are reported, enabling attainment of strikingly high photovoltages approaching 1 volt.
Journal ArticleDOI
Solar energy conversion by dye-sensitized photovoltaic cells
TL;DR: Developing solar cells that are based on the sensitization of mesoscopic oxide films by dyes or quantum dots, and the examples for the first outdoor application of such solar cells will be provided.
Journal ArticleDOI
Recent advances in sensitized mesoscopic solar cells.
TL;DR: The discussion focuses on mesoscopic solar cells, in particular, dye-sensitized solar cells (DSCs), which have been developed in the laboratory and remain the focus of the investigations, and aims at identifying and providing solutions to the efficiency problems that the OPV field is still facing.