Efficient osmium sensitizers containing 2,2′-bipyridine-4,4′-bisphosphonic acid ligand

Zabri, Hervé; Odobel, Fabrice; Altobello, Silvano; Caramori, Stefano; Bignozzi, Carlo Alberto

doi:10.1016/j.jphotochem.2004.04.030

Cited by 21 publications

(10 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[3][4][5][6][7][8] The approach of replacing the ruthenium metal center with osmium in the transition metal complexes used to sensitize nanocrystalline TiO 2 has been explored by other researchers. [9][10][11][12][13] Os(II) polypyridine sensitizers are known to give additional photoconversion efficiency in the red-to-near-infrared and are expected to give a higher integrated photocurrent density, relative to that of ruthenium sensitizers, provided that the excited state in the osmium complex effectively injects an electron into the conduction band of TiO 2 . 9,10 The kinetics of electron transfer at the semiconductor/solution interface is critical for optimizing device performance in DSCs.…”

Section: Introductionmentioning

confidence: 99%

Electrolyte-Dependent Photovoltaic Responses in Dye-Sensitized Solar Cells Based on an Osmium(II) Dye of Mixed Denticity

Onicha

Castellano

2010

J. Phys. Chem. C

View full text Add to dashboard Cite

This work focuses upon the effects of electrolyte composition, specifically the role of Li+ and I− ions, on the resultant photovoltaic performance of dye-sensitized solar cells (DSCs) based on a new Os(II) polypyridine complex of mixed denticity, [Os( t Bu3tpy)(dcbpyH2)(NCS)]PF6 (1). Photophysical and electrochemical characterization of 1 confirmed the suitability of this dye to serve as a sensitizer for regenerative DSCs on mesoscopic titania films. Device photovoltaic performances were assessed by measuring external quantum efficiencies as a function of wavelength, and current−voltage curves, the latter under simulated AM1.5G one-sun illumination. Varying the concentration of LiI in the redox electrolyte affects the short-circuit photocurrent (J SC), open-circuit voltage (V OC), fill factor (ff), power conversion efficiency (η), and external quantum efficiency (EQE) of the individual devices. Increasing the concentration of LiI results in enormous increases in J SC in the Os(II)-based devices accompanied by corresponding decreases in V OC. Independently increasing the concentration of I− by using either tetrabutylammonium iodide (TBAI) or the ionic liquid 1-n-propyl-3-methylimidazolium iodide (PMII) was found to increase J SC without concomitantly lowering the V OC. These observations are discussed and directly compared in parallel to devices based on the benchmark sensitizer N3, cis-Ru(dcbpyH2)2(NCS)2. The combined results suggest that the photovoltaic performance of Os(II)-based DSCs can indeed be optimized by simply modifying the composition of redox electrolytes used in the operational sandwich cells. An abundance of I− appears to be crucial for the effective regeneration of oxidized surface-bound osmium sensitizers and therefore for the production of higher photocurrents in these devices. We note that select devices based on 1 represent the record power conversion efficiency for an Os(II)-based DSC measured under simulated AM1.5G one-sun illumination, η = 4.7%.

show abstract

Section: Introductionmentioning

confidence: 99%

Electrolyte-Dependent Photovoltaic Responses in Dye-Sensitized Solar Cells Based on an Osmium(II) Dye of Mixed Denticity

Onicha

Castellano

2010

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…38.2a) used as sensitizers were found to be 50% less efficient than Ru complexes. However, osmium complexes have greater photochemical stability compared to the black dye [27,34]. The osmium complex in CH 3 OH showed a reversible Os II → Os III oxidation process that extended the spectral response of TiO 2 photoanodes [26,27,34].…”

Section: Complexes Of Osmiummentioning

confidence: 93%

“…The osmium complex (Fig. 38.3a) [26,27] was synthesized and characterized and it was found that its IPCE values were lower than those of the Ru complexes [26]. Osmium complexes (Fig.…”

Section: Complexes Of Osmiummentioning

confidence: 99%

Organometallic Compounds for Dye‐Sensitized Solar Cells (DSSC)

Ayele

Rick

et al. 2013

Advances in Organometallic Chemistry and Catalysis

View full text Add to dashboard Cite

“…Ultimately, complexes 20 and 22 gave high photocurrents and the fill factors were 0.56 and 0.42, respectively, with IPCE values of ca. 50% in the 600–700 nm spectral region [26]…”

Section: Thiocyanate‐free Osmium Sensitizer For Solar Cellsmentioning

confidence: 99%

Osmium Polypyridyl Complexes and Their Applications to Dye-Sensitized Solar Cells

Swetha

Reddy

Singh

2015

The Chemical Record

View full text Add to dashboard Cite

Dye-sensitized solar cells (DSSCs) have received much attention in recent years owing to their efficient conversion of sunlight to electricity. DSSCs became successful alternatives to silicon photovoltaic devices by virtue of their low fabrication costs and easy preparation methods. In DSSCs the dye plays the key role. This review summarizes the applications of osmium sensitizers in DSSCs. We also briefly discussed their synthesis and the effect of various electrolyte systems on device efficiencies.

show abstract

Efficient osmium sensitizers containing 2,2′-bipyridine-4,4′-bisphosphonic acid ligand

Cited by 21 publications

References 12 publications

Electrolyte-Dependent Photovoltaic Responses in Dye-Sensitized Solar Cells Based on an Osmium(II) Dye of Mixed Denticity

Electrolyte-Dependent Photovoltaic Responses in Dye-Sensitized Solar Cells Based on an Osmium(II) Dye of Mixed Denticity

Organometallic Compounds for Dye‐Sensitized Solar Cells (DSSC)

Osmium Polypyridyl Complexes and Their Applications to Dye-Sensitized Solar Cells

Contact Info

Product

Resources

About