Journal ArticleDOI
A Ruthenium Complex with Superhigh Light‐Harvesting Capacity for Dye‐Sensitized Solar Cells
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TLDR
A new ruthenium photosensitizer CYC-B1 is reported in which one of the dcbpy ligands in N3 was replaced with abtpy, a bipyridine ligand substituted with alkyl bithiophene groups and its power-conversion efficiency is 10% higher than that of N3 under the same cell fabrication and measuring procedures carried out in the laboratory.Abstract:
A dye-sensitized solar cell (DSSC) using Ru complexes as a photosensitizer was first reported by O Regan and Gr\"tzel in 1991. The low-cost, easy preparation make DSSC one of the most promising photovoltaic cells for conversion of sunlight to electricity. Numerous sensitizers have been prepared, and their performance has been tested. A conversion efficiency of up to 11% was achieved by using cis-di(thiocyanato)bis(2,2’-bipyridyl-4,4’-dicarboxylate)ruthenium(II) (N3) as a photosensitizer. However, the conversion efficiency of DSSCs is still lower than that of the silicon-based photovoltaic cells. To obtain a high conversion efficiency, optimization of the short-circuit photocurrent (Isc) and open-circuit potential (Voc) of the cell is essential. The value of Voc depends on the edge of conduction band in TiO2 and the redox potential of I / I3 , otherwise Isc is related to the interaction between TiO2 and the sensitizer as well as the absorption coefficient of the sensitizer. The conduction band of TiO2 was known to have a Nernstian dependence on pH. Thus, the molecular engineering of the ruthenium complexes for achieving the highest efficiency was attempted to increase the molar absorption coefficient and reduce the number of protons on the complexes. 4,4’-Dicarboxylic acid-2,2’-bipyridine (dcbpy) has been considered as the best anchoring ligand in Ru sensitizers. Finding new metal-complex sensitizers with higher conversion efficiency was achieved by modifying one of the anchoring ligands. Replacement of one of the dcbpy anchoring ligands with a highly conjugated ancillary ligand represents a molecular engineering approach for increasing the absorption coefficient and therefore the photocurrent density of the sensitizers as reported by Gr\"tzel and coworkers. Herein, we report a new ruthenium photosensitizer CYC-B1 in which one of the dcbpy ligands in N3 was replaced with abtpy, a bipyridine ligand substituted with alkyl bithiophene groups. CYC-B1 has the highest absorption coefficient among the Ru-based photosensitizers used in DSSCs, and its power-conversion efficiency is 10% higher than that ofN3 under the same cell fabrication and measuring procedures carried out in our laboratory. CYC-B1 was prepared in a typical one-pot synthesis, and its structure (Scheme 1) was identified from NMRread more
Citations
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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
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.
Journal ArticleDOI
Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells
Feifei Gao,Yuan Wang,Dong Shi,Jing Zhang,Mingkui Wang,Xiaoyan Jing,Robin Humphry-Baker,Peng Wang,Shaik M. Zakeeruddin,Michael Grätzel +9 more
TL;DR: Two new heteroleptic polypyridyl ruthenium complexes are reported with high molar extinction coefficients by extending the pi-conjugation of spectator ligands, with a motivation to enhance the optical absorptivity of mesoporous titania film and charge collection yield in a dye-sensitized solar cell.
Journal ArticleDOI
Functional oligothiophenes: molecular design for multidimensional nanoarchitectures and their applications.
TL;DR: Dithieno[3,2-b:2′3′-d]thiophene-4,4-dioxides 1221 3.3.1.
Journal ArticleDOI
Highly Efficient Light-Harvesting Ruthenium Sensitizer for Thin-Film Dye-Sensitized Solar Cells
Chia Yuan Chen,Mingkui Wang,Jheng Ying Li,Nuttapol Pootrakulchote,Leila Alibabaei,Cevey Ha Ngoc-Le,Jean David Decoppet,Jia Hung Tsai,Carole Grätzel,Chun Guey Wu,Shaik M. Zakeeruddin,Michael Grätzel +11 more
TL;DR: A high molar extinction coefficient heteroleptic ruthenium complex, incorporating an electron-rich hexylthio-terminal chain, has been synthesized and demonstrated as an efficient sensitizer for dye-sensitized solar cells.
References
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A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
TL;DR: In this article, the authors describe a photovoltaic cell, created from low-to medium-purity materials through low-cost processes, which exhibits a commercially realistic energy-conversion efficiency.
Journal ArticleDOI
Conversion of light to electricity by cis-X2bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) charge-transfer sensitizers (X = Cl-, Br-, I-, CN-, and SCN-) on nanocrystalline titanium dioxide electrodes
Mohammad Khaja Nazeeruddin,Andreas Kay,I. Rodicio,Robin Humphry-Baker,E. Mueller,Paul Liska,Nick Vlachopoulos,Michael Graetzel +7 more
TL;DR: Cis-X 2 Bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) complexes were prepared and characterized with respct to their absorption, luminescence, and redox behavior.
Journal ArticleDOI
Engineering of Efficient Panchromatic Sensitizers for Nanocrystalline TiO2-Based Solar Cells
Mohammad Khaja Nazeeruddin,Peter Pechy,Thierry Renouard,Shaik M. Zakeeruddin,Robin Humphry-Baker,Pascal Comte,Paul Liska,Le Cevey,E Costa,Valery Shklover,Leone Spiccia,Glen B. Deacon,Carlo Alberto Bignozzi,Michael Grätzel +13 more
TL;DR: The black dye, when anchored to nanocrystalline TiO(2) films achieves very efficient sensitization over the whole visible range extending into the near-IR region up to 920 nm, yielding over 80% incident photon-to-current efficiencies (IPCE).
Journal ArticleDOI
Conversion of sunlight to electric power by nanocrystalline dye-sensitized solar cells
TL;DR: The dye-sensitized solar cell (DSC) as mentioned in this paper provides a technically and economically credible alternative concept to present day p-n junction photovoltaic devices, where light is absorbed by a sensitizer, which is anchored to the surface of a wide band gap oxide semiconductor.
Journal ArticleDOI
A stable quasi-solid-state dye-sensitized solar cell with an amphiphilic ruthenium sensitizer and polymer gel electrolyte.
Peng Wang,Shaik M. Zakeeruddin,Jacques-E. Moser,Mohammad Khaja Nazeeruddin,Takashi Sekiguchi,Michael Grätzel +5 more
TL;DR: A DSC with unprecedented stable performance under both thermal stress and soaking with light, matching the durability criteria applied to silicon solar cells for outdoor applications is shown, fostering widespread practical application of dye-sensitized solar cells.