- New terpyridine-based ruthenium complexes for dye sensitized solar cells applications
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Three new terpyridine-based ruthenium complexes, named as MC124, MC125 and MC127, were synthesized and employed as sensitizers in dye sensitized solar cells. The MC dyes were characterized with experimental techniques followed by theoretical calculations. The promising optical properties with higher molar extinction coefficients compared to N749 prototypical dye, and suitable positioning of energy levels prompted us to employ these dyes in working devices. When used in conjunction with liquid I-/I3- redox electrolyte, the MC dyes have shown modest performances, with a maximum PCE of 2.3% reached with MC124 in combination of CDCA used as co-adsorbent.
- Koyyada, Ganesh,Kumar Ch, Pavan,Salvatori, Paolo,Marotta, Gabriele,Lobello, Maria Grazia,Bizzarri, Olivia,De Angelis, Filippo,Malapaka, Chandrasekharam
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Read Online
- A method of manufacturing a sensitizing dye-based optical ruthenic
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PROBLEM TO BE SOLVED: To provide a method for producing a ruthenium photosensitizing dye that can improve production efficiency of the ruthenium photosensitizing dye.SOLUTION: The method for producing a ruthenium photosensitizing dye by coordinating a terpyridine compound and thiocyan into ruthenium includes a first dissolving step of dissolving a ruthenium complex composed of a dichlororuthenium(p-cymene) dimer and the like and a terpyridine compound in a solvent, a second dissolving step of dissolving a thiocyanate in the solvent and a reaction step of reacting an intermediate produced by reacting the ruthenium complex and the terpyridine compound in the solvent with the thiocyanate to produce a ruthenium photosensitizing dye.
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Paragraph 0058
(2017/03/18)
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- 4,4′-Unsymmetrically substituted-2,2′-bipyridines: Novel bidentate ligands on ruthenium(II) [3 + 2 + 1] mixed ligand complexes for efficient sensitization of nanocrystalline TiO2 in dye solar cells
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A series of five new ruthenium [3 + 2 + 1] complexes coded as MC107-MC111, with novel unsymmetrical bipyridines as ancillary ligands and terpyridine tricarboxylic acid as an anchoring ligand have been successfully synthesized and characterized by 1H NMR, 13C NMR and UV-Visible spectrometry. Improvement in the molar extinction coefficient of all these sensitizers was observed compared with reference standard N749 dye under comparable conditions. Among all the new sensitizers MC108 exhibited a maximum solar to electrical conversion efficiency of 5.573% (Jsc = 16.81 mA cm-2, Voc = 0.50 V. FF = 0.65) under standard global AM 1.5 G solar condition, when compared to the N749 dye with an efficiency of 6.29% (Jsc = 13.74 mA cm-2, Voc = 0.67 V. FF = 0.68) under similar fabrication and evaluation conditions. Density functional theory (DFT) and time-dependent DFT calculations are carried out for MC107-MC111 to understand their structural, electronic and photophysical properties.
- Chandrasekharam,Kumar, Ch. Pavan,Singh, Surya Prakash,Anusha,Bhanuprakash,Islam,Han
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p. 26035 - 26046
(2013/12/04)
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- A new familiy of heteroleptic ruthenium(ii) polypyridyl complexes for sensitization of nanocrystalline TiO2 films
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Two new heteroleptic ruthenium(ii) photosensitizers that contains 2,2′;6,2′′-terpyridine with extended π-conjugation with donor groups, a 4,4′-dicarboxylic acid-2,2′-bipyridine anchoring ligand and a thiocyanate ligand have been designed, synthesized and fully characterized by CHN, mass spectrometry, UV-vis and fluorescence spectroscopies and cyclic voltammetry. The new sensitizers have either 3,5-di-tert-butyl phenyl (m-BL-5) or triphenylamine (m-BL-6) groups, where the molar extinction coefficient of both the sensitizers is higher than the analogous ruthenium dyes. Both the sensitizers were tested in dye-sensitized solar cells using two different redox electrolytes.
- Giribabu, Lingamallu,Bessho, Takeru,Srinivasu, Mareedu,Vijaykumar, Challuri,Soujanya, Yarasi,Reddy, Veeranagari Gopal,Reddy, Paidi Yella,Yum, Jun-Ho,Graetzel, Michael,Nazeeruddin, Mohammad Khaja
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experimental part
p. 4497 - 4504
(2011/06/22)
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- Engineering of efficient panchromatic sensitizers for nanocrystalline TiO2-based solar cells
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A new series of panchromatic ruthenium(II) sensitizers derived from carboxylated terpyridyl complexes of tris-thiocyanato Ru(II) have been developed. Black dye containing different degrees of protonation {(C2H5)3NH}[Ru(H3tcterpy)(NCS) 3] 1, {(C4H9)4N}2[Ru(H2 tcterpy)(NCS)3] 2, {(C4H9)4N}3[Ru(Htcterpy)(NCS) 3] 3, and {(C4H9)4N}4[Ru(tcterpy)(NCS) 3] 4 (tcterpy = 4,4′,4″-tricarboxy-2,2′:6′,2″-terpyridine) have been synthesized and fully characterized by UV-vis, emission. IR, Raman, NMR, cyclic voltammetry, and X-ray diffraction studies. The crystal structure of complex 2 confirms the presence of a RuIIN6 central core derived from the terpyridine ligand and three N-bonded thiocyanates. Intermolecular H-bonding between carboxylates on neighboring terpyridines gives rise to 2-D H-bonded arrays. The absorption and emission maxima of the black dye show a bathochromic shift with decreasing pH and exhibit pH-dependent excited-state lifetimes. The red-shift of the emission maxima is due to better π-acceptor properties of the acid form that lowers the energy of the CT excited state. The low-energy metal-to-ligand charge-transfer absorption band showed marked solvatochromism due to the presence of thiocyanate ligands. The Ru(II)/(III) oxidation potential of the black dye and the ligand-based reduction potential shifted cathodically with decreasing number of protons and showed more reversible character. The adsorption of complex 3 from methoxyacetonitrile solution onto transparent TiO2 films was interpreted by a Langmuir isotherm yielding an adsorption equilibrium constant, Kads, of (1.0 ± 0.3) × 105 M-1. The amount of dye adsorbed at monolayer saturation was (na = 6.9 ± 0.3) × 10-8 mol/mg of TiO2, which is around 30% less than that of the cis-di(thiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylate) ruthenium(II) complex. The black dye, when anchored to nanocrystalline TiO2 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). Solar cells containing the black dye were subjected to analysis by a photovoltaic calibration laboratory (NREL, U.S.A.) to determine their solar-to-electric conversion efficiency under standard AM 1.5 sunlight. A short circuit photocurrent density obtained was 20.5 mA/cm2, and the open circuit voltage was 0.72 V corresponding to an overall conversion efficiency of 10.4%.
- Nazeeruddin,Pechy,Renouard,Zakeeruddin,Humphry-Baker,Cointe,Liska,Cevey,Costa,Shklover,Spiccia,Deacon,Bignozzi,Graetzel
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p. 1613 - 1624
(2007/10/03)
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- Efficient panchromatic sensitization of nanocrystalline TiO2 films by a black dye based on a trithiocyanato-ruthenium complex
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A black trithiocyanato-ruthenium(II) terpyridyl complex where the terpyridyl ligand is substituted by three carboxyl groups in 4,4′,4″-positions achieves very efficient panchromatic sensitization of nanocrystalline TiO2 solar cells over the whole visible range extending into the near-IR region up to 920 nm.
- Nazeeruddin,Pechy,Graetzel
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p. 1705 - 1706
(2007/10/03)
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