Femtosecond Decay and Electron Transfer Dynamics of the Organic Sensitizer D149 and Photovoltaic Performance in Quasi-Solid-State Dye-Sensitized Solar Cells

Fakis, Mihalis; Σταθάτος, Ηλίας; Tsigaridas, G.; Giannetas, V.; Persephonis, P.

doi:10.1021/jp201143n

Cited by 63 publications

(126 citation statements)

References 55 publications

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“…We note that Fakis et al 14 reported the fluorescence maximum in acetonitrile at ca. 615 nm, which is blue-shifted by 49 nm with respect to our value.…”

mentioning

confidence: 61%

“…1. Surprisingly, so far there has been only very limited information on indoline dynamics after photoexcitation, e.g., a study of Fakis et al for D149 in toluene and acetonitrile and on Al 2 O 3 and TiO 2 surfaces using single-wavelength fluorescence up-conversion, 14 which will be discussed with respect to our current findings below. In addition, DFT/TD-DFT calculations have been reported and assigned considerable charge transfer (CT) character to the S 1 state.…”

Section: Introductionmentioning

confidence: 71%

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Ultrafast photoinduced relaxation dynamics of the indoline dye D149 in organic solvents

Lohse

Kuhnt

Druzhinin

et al. 2011

Phys. Chem. Chem. Phys.

111

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The relaxation dynamics of the indoline dye D149, a well-known sensitizer for photoelectrochemical solar cells, have been extensively characterized in various organic solvents by combining results from ultrafast pump-supercontinuum probe (PSCP) spectroscopy, transient UV-pump VIS-probe spectroscopy, time-correlated single-photon counting (TCSPC) measurements as well as steady-state absorption and fluorescence. In the steady-state spectra, the position of the absorption maximum shows only a weak solvent dependence, whereas the fluorescence Stokes shift Dñ F correlates with solvent polarity. Photoexcitation at around 480 nm provides access to the S 1 state of D149 which exhibits solvation dynamics on characteristic timescales, as monitored by a red-shift of the stimulated emission and spectral development of the excited-state absorption in the transient PSCP spectra. In all cases, the spectral dynamics can be modeled by a global kinetic analysis using a time-dependent S 1 spectrum. The lifetime t 1 of the S 1 state roughly correlates with polarity [acetonitrile (280 ps) o acetone (540 ps) o THF (720 ps) o chloroform (800 ps)], yet in alcohols it is much shorter [methanol (99 ps) o ethanol (178 ps) o acetonitrile (280 ps)], suggesting an appreciable influence of hydrogen bonding on the dynamics. A minor component with a characteristic time constant in the range 19-30 ps, readily observed in the PSCP spectra of D149 in acetonitrile and THF, is likely due to removal of vibrational excess energy from the S 1 state by collisions with solvent molecules. Additional weak fluorescence in the range 390-500 nm is observed upon excitation in the S 0 -S 2 band, which contains short-lived S 2 -S 0 emission of D149. Transient absorption signals after excitation at 377.5 nm yield an additional time constant in the subpicosecond range, representing the lifetime of the S 2 state. S 2 excitation also produces photoproducts.

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“…We note that Fakis et al 14 reported the fluorescence maximum in acetonitrile at ca. 615 nm, which is blue-shifted by 49 nm with respect to our value.…”

mentioning

confidence: 61%

Section: Introductionmentioning

confidence: 71%

Ultrafast photoinduced relaxation dynamics of the indoline dye D149 in organic solvents

Lohse

Kuhnt

Druzhinin

et al. 2011

Phys. Chem. Chem. Phys.

111

View full text Add to dashboard Cite

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“…The films were heated up to 500°C for 30 min total time using 20°C/min heating ramp rate. Titania thin films were deposited by following a previously reported procedure [23]. Briefly, for 12.5 ml solution, 1.8 g of Triton X-100 were mixed with 10 ml of ethanol, followed by addition of 0.8 ml of glacial acetic acid and 0.9 ml of titanium isopropoxide under vigorous stirring.…”

Section: Thin Films and Device Fabricationmentioning

confidence: 99%

“…Time resolved fluorescence upconversion spectroscopy has been used for examining the injection dynamics in the fs to ps timescale as in previous publications [23,26]. A mode-locked Ti:Sapphire femtosecond laser emitting laser pulses at 800 nm with 80 fs duration and 80 MHz repetition rate has been used as the fundamental laser source.…”

Section: Steady State and Time Resolved Spectroscopymentioning

confidence: 99%

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Electron injection studies in TiO2 nanocrystalline films sensitized with fluorene dyes and photovoltaic characterization. The effect of co-adsorption of a bile acid derivative

Dori

Seintis

Σταθάτος³

et al. 2013

Chemical Physics Letters

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Peripheral Hole Acceptor Moieties on an Organic Dye Improve Dye‐Sensitized Solar Cell Performance

et al. 2015

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Investigation of charge transfer dynamics in dye‐sensitized solar cells is of fundamental interest and the control of these dynamics is a key factor for developing more efficient solar cell devices. One possibility for attenuating losses through recombination between injected electrons and oxidized dye molecules is to move the positive charge further away from the metal oxide surface. For this purpose, a metal‐free dye named E6 is developed, in which the chromophore core is tethered to two external triphenylamine (TPA) units. After photoinduced electron injection into TiO2, the remaining hole is rapidly transferred to a peripheral TPA unit. Electron–hole recombination is slowed down by 30% compared to a reference dye without peripheral TPA units. Furthermore, it is found that the added TPA moieties improve the electron blocking effect of the dye, retarding recombination of electrons from TiO2 to the cobalt‐based electrolyte.

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Femtosecond Decay and Electron Transfer Dynamics of the Organic Sensitizer D149 and Photovoltaic Performance in Quasi-Solid-State Dye-Sensitized Solar Cells

Cited by 63 publications

References 55 publications

Ultrafast photoinduced relaxation dynamics of the indoline dye D149 in organic solvents

Ultrafast photoinduced relaxation dynamics of the indoline dye D149 in organic solvents

Electron injection studies in TiO2 nanocrystalline films sensitized with fluorene dyes and photovoltaic characterization. The effect of co-adsorption of a bile acid derivative

Peripheral Hole Acceptor Moieties on an Organic Dye Improve Dye‐Sensitized Solar Cell Performance

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