Development and Photovoltaic Performance of Oligothiophene-sensitized TiO2 Solar Cells

Tanaka, Koki; Takimiya, Kazuo; Otsubo, Tetsuo; Kawabuchi, Koji; Kajihara, Shotaro; Harima, Yutaka

doi:10.1246/cl.2006.592

Cited by 42 publications

(25 citation statements)

References 17 publications

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“…Different π-conjugated linker groups such as the -C=C-chain, [9][10][11][12][13]16,24 thiophene units (and its derivatives), 11,[14][15][16][17][18][19][20][21][22]26 etc have also been investigated. In particular two types of acceptor/anchor groups, namely cyanoacrylic acid, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] and carboxylic acid [27][28][29] are widely used in organic dyes for DSSC.…”

Section: Introductionmentioning

confidence: 99%

A TD-DFT study of the effects of structural variations on the photochemistry of polyenedyes

et al. 2012

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We report a TD-DFT study of three polyene dyes namely: NKX-2553, NKX-2554 and NKX-2569 in isolation as well as upon their adsorption on TiO 2 nanoparticles. By choosing closely related dyes we wish to focus on the effects of structural variations on the absorption and charge-transfer properties of these systems. These three dyes show a non-intuitive trend in their respective efficiencies and therefore, were chosen to shed light on the structural components that contribute to this behaviour. Although, NKX-2554 has an additional donor group, it is less efficient compared to the simpler NKX-2553 dye that contains only one donor group. When NKX-2554 structure is slightly modified by lengthening the linker-group, one obtains the most efficient dye among this set, namely, NKX-2569. In this work, we show that the changes in the donor moiety has very little or no effect on the efficiency of these dyes as can be seen in the case of NKX-2553 and NKX-2554. On the other hand, the improved performance of NKX-2569-titania complex can be understood to be a result of the longer linker group. A better understanding of these properties within different dye-titania complexes is important for the continual improvement of DSSCs. In this regards, this study will serve to provide guidelines to improve efficiencies of novel organic dyes.

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Section: Introductionmentioning

confidence: 99%

A TD-DFT study of the effects of structural variations on the photochemistry of polyenedyes

et al. 2012

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“…Metal-free organic dyes such as triarylamine dyes [11e16], hemicyanine dyes [17,18], thiophene-based dyes [19], indoline dyes [20e26], heteropolycyclic dyes [27], porphyrin dyes [28e31], and phthalocyanine [32] dyes, have been developed, and solar-to-electric power-conversion efficiencies have been sharply increasing reaching ca. 10% [3,33,34].…”

Section: Introductionmentioning

confidence: 99%

Coumarin dyes containing low-band-gap chromophores for dye-sensitised solar cells

et al. 2011

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“…10,11 An organic sensitizer usually is bestowed with a donor part (electron donating group), an acceptor part (electron accepting group) and a linker group. A number of donor groups have been investigated with varying success rates such as oligenes, [12][13][14] coumarins, 4,[15][16][17][18][19] quinoxalines, 20,21 triphenylamine, [22][23][24][25] pyrrolidino, 26 and π-conjugated linker groups such as C-C double bonded chain, 12,14 thiophene units, 17,18,20,21,27,28 . Inpartcular two types of acceptor/anchor groups, namely cyanoacrylic acid, 4,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] and carboxylic acid [27][28][29] are widely used in organic dye synthesis.…”

Section: Introductionmentioning

confidence: 99%

First-principles study of the excited-state properties of coumarin-derived dyes in dye-sensitized solar cells

et al. 2011

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Using Time-Dependent Density Functional Theory (TD-DFT), we have investigated the optical properties of dye-sensitized solar cells (DSSCs) comprised of TiO 2 nanoparticle sensitized with two coumarins, namely, NKX-2311 and NKX-2593. The two sensitizers (dyes) differ only in their linker moieties and are shown to have different absorption spectra when adsorbed on to the TiO 2 surface. Knowledge of different light absorption and charge transfer (CT) behavior within these complexes is useful for further improving the photo-dynamics of newer organic dyes presently being designed and investigated worldwide. Moreover, we have also investigated the effect of deprotonation of the sensitizers' carboxylic groups during adsorption on the titania surface and the excited state electronic properties of the resulting species.

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Development and Photovoltaic Performance of Oligothiophene-sensitized TiO2 Solar Cells

Cited by 42 publications

References 17 publications

A TD-DFT study of the effects of structural variations on the photochemistry of polyenedyes

A TD-DFT study of the effects of structural variations on the photochemistry of polyenedyes

Coumarin dyes containing low-band-gap chromophores for dye-sensitised solar cells

First-principles study of the excited-state properties of coumarin-derived dyes in dye-sensitized solar cells

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