Vibrational and Electronic Spectroscopy of Electronically Excited Polychromophoric Ruthenium(II) Complexes

Bignozzi, Carlo Alberto; Argazzi, Roberto; Chiorboli, Claudio; Scandola, Franco; Dyer, R. Brian; Schoonover, Jon R.; Meyer, Thomas J.

doi:10.1021/ic00086a015

Cited by 99 publications

(112 citation statements)

References 7 publications

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“…The luminescent emission shown in Fig. 4b is attributed to the radiative relaxation of an excited 3MLCT localized on the central unit as was demonstrated by time resolved Raman measurements to be reported in a subsequent paper [18]. The emission yield or photoluminescence efficiency, ~, observed in ethanol is 5 x 10 -3 relative to [Ru(bpy)3] 3+ which has a • value of approximately 0.06 [19].…”

Section: Ru Trinuclear Dye Anionic Formsupporting

confidence: 65%

“…where ~/is the inter-system crossing efficiency (from singlet to triplet states), which is thought to be unity for the Rubpy dyes [13,18]. Similarly, the photoluminescence efficiency of the free dye is given by ~free = r/kr~'0 = rlkr/(kr + knr)" (3) The measured lifetime of the free dye, T 0, in ethanol is [13,16] 320 ns, and the measured photoluminescence efficiency is 5 × 10 -3.…”

Section: Discussion Of Photoluminescencementioning

confidence: 99%

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Testing of dye sensitized TiO2 solar cells I: Experimental photocurrent output and conversion efficiencies

Smestad

Bignozzi²,

Argazzi³

1994

Solar Energy Materials and Solar Cells

321

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Recently, a paper was published by the Lausanne Group headed by Dr. M. Graetzel which reported a simple low cost 7% efficient photo electrochemical solar cell made from a trinuclear Ru dye complex adsorbed on the very rough surface of a colloidal TiO 2 film. In the current paper, a verification of this result is presented using procedures described in the literature. Measurements are reported in simulated and natural sunlight which confirm that the efficiency is indeed in the range previously reported. Predicted Air Mass 1.5 photo currents are compared to those obtained from fabricated dye sensitized cells. Although current densities of 12 mA/cm 2 and voltages of over 0.6 V are measured, it is found that corresponding fill factors, less than 0.6, limit the performance of the cell under solar illumination. The basic economics of such a device are outlined and it is proposed that cell costs of $ 0.6 per peak watt could be possible if the longevity of the cell is at least 15 years.

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Section: Ru Trinuclear Dye Anionic Formsupporting

confidence: 65%

Section: Discussion Of Photoluminescencementioning

confidence: 99%

Testing of dye sensitized TiO2 solar cells I: Experimental photocurrent output and conversion efficiencies

Smestad

Bignozzi²,

Argazzi³

1994

Solar Energy Materials and Solar Cells

321

View full text Add to dashboard Cite

show abstract

“…Taking this comparative analysis a step further, one could think of applying some of the strategies of photosynthesis to increase the efficiency of these photoelectrochemical cells 51 . For instance, just as it is done in going from triads to tetrads, pentads etc.…”

Section: Resultsmentioning

confidence: 99%

“…A one-dimensional antenna requires stepwise energy transfer along a chain of molecular components, and the maximum length of the system (i.e., number of components) depends critically on the driving force demand of each energy-transfer step. The possibility to obtain efficient energy migration along chain-like systems has been checked with the cyano-bridged pentanuclear species shown in Figure 10a 39 . These results suggest that, in strongly coupled systems of this type, energy migration between isoenergetic adjacent molecular components takes placen efficiently.…”

Section: Artificial Antenna Systemsmentioning

confidence: 99%

Chemistry and light - part 2: light and energy

1997

Self Cite

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Recebido em 19/8/96The conversion of solar energy into more useful forms of energy, such as chemical fuels or electricity, is one of the central problems facing modern science. Progress in photochemistry and chemical synthesis has led to a point where light energy conversion by means of artificial molecular devices can be rationally attempted. In this article, a general approach towards this challenging goal is presented. Thomas, Leipzig (1911)

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“…Having this aim as the main purpose, an interdisciplinary program between distinct institutions was established to discuss subjects on the development of photovoltaics and solar energy technology under a CIUPE program ( 1 ) the Polytechnic School -USP on the deposition of TiO 2 films employed in photoelectrochemical solar cells. Investigation on dye-sensitized photoelectrochemical solar cells has experienced remarkable progress since the development of porous nanometric TiO 2 films with a large surface area [1][2][3][4]. Such cells have acquired increasing recognition as a promising alternative to traditional silicon-based solar cells [5,6].…”

Section: Introductionmentioning

confidence: 99%

An interdisciplinary experience on the development of Dye‐Cell technology

Garcia

Iha

2001

International Journal of Photoenergy

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Abstract. Under a special program supported by the University of São Paulo (USP) for the development of strategic fields of research, interdisciplinar discussion on the development of photovoltaics and energy technology has been established. Several aspects concerned to solar energy and PV technology were discussed in regular meetings along a year by professionals of different domains. As a result of the program, a collaborative work on the deposition of TiO 2 films employed in photoelectrochemical solar cells has been established between the Laboratory of Inorganic Photochemistry and Energy Conversion at the IQ-USP and other research groups.Preparation of TiO 2 emulsions from distinct methods were performed and compared. Spin-coating and painting techniques have been employed for the deposition of TiO 2 films over TCO substrates. Both techniques resulted in transparent homogeneous TiO 2 films which were successfully used as dye-sensitized photoanodes in solar cells. The results show that thin-film properties, such as thickness and transparency, can be controlled through the deposition technique and that photoelectrochemical measurements carried out by our group have been performed under appropriate film deposition conditions. This experience shows also that different institutions, with distinct purposes, can interact and work together to prepare qualified professionals for many areas of modern science and technology.

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Vibrational and Electronic Spectroscopy of Electronically Excited Polychromophoric Ruthenium(II) Complexes

Cited by 99 publications

References 7 publications

Testing of dye sensitized TiO2 solar cells I: Experimental photocurrent output and conversion efficiencies

Testing of dye sensitized TiO2 solar cells I: Experimental photocurrent output and conversion efficiencies

Chemistry and light - part 2: light and energy

An interdisciplinary experience on the development of Dye‐Cell technology

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