Highly efficient metal-free organic dyes for dye-sensitized solar cells

Horiuchi, Tamotsu; Miura, Hidetoshi; Uchida, Satoshi

doi:10.1016/j.jphotochem.2003.12.018

Cited by 144 publications

(63 citation statements)

References 8 publications

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“…One solution to enabling significant light absorption in thin films is to employ sensitizer molecules with enhanced absorption coefficients. Indoline-derived organic dyes [47,48] and porphyrin-based [27] complexes have proven to be exceptionally effective "high extinction coefficient" sensitizers. The extinction coefficient of an indoline-based dye (termed D102) is approximately 55 800 L mol -1 cm -1 at 491 nm, which yields over 90 % absorption over a broad spectral range when sensitizing mesoporous TiO 2 films as thin as 1.4 lm.…”

Section: Light Absorption and Charge Generationmentioning

confidence: 99%

Advances in Liquid‐Electrolyte and Solid‐State Dye‐Sensitized Solar Cells

2007

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This Progress Report highlights recent developments in dye‐sensitized solar cells composed of both liquid electrolytes and solid‐state hole transport materials. The authors discuss and review the present understanding of and recent developments in the operational processes, such as charge generation, transport, recombination, and charge collection. Also, the merits and challenges of alternative device approaches are discussed, including extremely thin absorber cells, devices containing inorganic p‐type hole‐transporters and non‐TiO2 mesoporous metal‐oxide electrodes employed in dye‐sensitized solar cells.

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Section: Light Absorption and Charge Generationmentioning

confidence: 99%

Advances in Liquid‐Electrolyte and Solid‐State Dye‐Sensitized Solar Cells

2007

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“…Information in our previous report indicated that the dye was anchored to TiO 2 via carboxylate groups, but the adsorption structure and the number of anchors are still under discussion. [18][19][20] To obtain more information about the adsorption mode of the dyes onto nanocrystalline TiO 2 , we make the following new kinds of measurements: We selectively observe one of the coadsorbed dyes by focusing on the S atom in the NCS functional group of the BD, which is useful because the D131 21 molecule does not contain S atoms (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the influence of coadsorbent dye upon the interfacial structure of dye-sensitized solar cells

Honda

Yanagida

et al. 2014

The Journal of Chemical Physics

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The interface between Ru(tcterpy)(NCS)3TBA2 [black dye (BD); tcterpy = 4,4′,4″-tricarboxy-2,2′:6′,2″-terpyridine, NCS = thiocyanato, TBA = tetrabutylammonium cation] and nanocrystalline TiO2, as found in dye-sensitized solar cells, is investigated by soft-X-ray synchrotron radiation and compared with the adsorption structure of cis-Ru(Hdcbpy)2(NCS)2TBA2 (N719; dcbpy = 4,4′-dicarboxy-2,2′-bipyridine) on TiO2 to elucidate the relationship between the adsorption mode of BD and the photocurrent with and without coadsorbed indoline dye D131. The depth profile is characterized with X-ray photoelectron spectroscopy and S K-edge X-ray absorption fine structure using synchrotron radiation. Both datasets indicate that one of the isothiocyanate groups of BD interacts with TiO2 via its S atom when the dye is adsorbed from a single-component solution. In contrast, the interaction is slightly suppressed when D131 is coadsorbed, indicated by the fact that the presence of D131 changes the adsorption mode of BD. Based upon these results, the number of BD dye molecules interacting with the substrate is shown to decrease by 10% when D131 is coadsorbed, and the dissociation is shown to be related to the short-circuit photocurrent in the 600–800 nm region. The design of a procedure to promote the preferential adsorption of D131 therefore leads to an improvement of the short-circuit current and conversion efficiency.

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“…Indoline dyes have previously been used in dye-sensitized solar cells with a liquid electrolyte. [9,10] There also they showed a good performance of up to g = 6.1 % conversion efficiency compared to 6.3 % for a N3 dye-sensitized cell.[9] Solid-state devices usually have a lower performance, which is not the case here with an extraordinary efficiency of 4 %, which approaches that of their liquid electrolyte counterpart. Figure 1a shows the chemical structure of the indoline dye D102 and spiro-OMeTAD (Fig.…”

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confidence: 99%

Organic Dye for Highly Efficient Solid‐State Dye‐Sensitized Solar Cells

Schmidt‐Mende¹,

et al. 2005

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[26] SIMS analysis was carried out in the negative-ion mode with a 25 kV Ga + primary ion gun and a 2 pA ion-beam current.[27] On some substrates, we also purposely denatured the attached laminin using hot water. On those substrates, no PC12 activity could be seen. Dye-sensitized solar cells are an interesting low-cost alternative to conventional solar cells. Efficiencies over 10 % have been achieved. [1,2] Advantageous is the replacement of the liquid electrolyte in these devices with a solid charge carrier material to avoid any sealing and long-term stability problems. In 1998 Bach et al. [3] demonstrated that the electrolyte can be replaced by a hole conductor. Here we report a very efficient solid-state solar cell with the amorphous organic hole transport material 2,2¢,7,7¢-tetrakis-(N,N-di-p-methoxyphenylamine)9,9¢-spirobifluorene (spiro-OMeTAD) as hole conductor and for the first time an organic metal-free indoline dye as sensitizer. Record efficiencies for this type of cell of over 4 % over the solar spectrum were reached. Until now, sensitization using organic dyes has not been as efficient as using ruthenium dyes, which have been successfully applied previously. Metal-free dyes such as perylene derivatives, [4] coumarin dyes, [5] porphyrin dyes, [6] and cyanine and merocyanine dyes [7] have been used as sensitizers, but did not achieve the same solar conversion efficiency as ruthenium dyes. The efficiencies achieved in this work with the indoline dye (D102) are even higher than the highest currently reported values for ruthenium-dye sensitized solid-state cells. In addition, this dye has the advantage that it can be produced at low cost, because it does not contain the expensive rare metal ruthenium and it is easy to synthesize. Up to now the best results reported with spiro-OMeTAD as a hole conductor are efficiencies of 3.2 %. [8] In that work the dye uptake and open-circuit voltage were optimized by a silver complexation. In the case of the indoline dye we were able to reach an efficiency of just over 4 % without further optimization. This shows the extremely high potential of the indoline dye as a sensitizer in solid-state dye-sensitized solar cells. Indoline dyes have previously been used in dye-sensitized solar cells with a liquid electrolyte. [9,10] There also they showed a good performance of up to g = 6.1 % conversion efficiency compared to 6.3 % for a N3 dye-sensitized cell.[9] Solid-state devices usually have a lower performance, which is not the case here with an extraordinary efficiency of 4 %, which approaches that of their liquid electrolyte counterpart. Figure 1a shows the chemical structure of the indoline dye D102 and spiro-OMeTAD (Fig. 1b), the organic compounds used in this work.The dye D102 has a very strong absorption coefficient (55 800 L mol ±1 cm ±1 at 491 nm), which is four times stronger than the previously used ruthenium dye N3 (13 900 L mol ±1 cm ±1 at 541 nm). [9] This makes it of especial interest for solid-state devices, where the film thickness is crucial. Our results show...

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Highly efficient metal-free organic dyes for dye-sensitized solar cells

Cited by 144 publications

References 8 publications

Advances in Liquid‐Electrolyte and Solid‐State Dye‐Sensitized Solar Cells

Advances in Liquid‐Electrolyte and Solid‐State Dye‐Sensitized Solar Cells

Investigation of the influence of coadsorbent dye upon the interfacial structure of dye-sensitized solar cells

Organic Dye for Highly Efficient Solid‐State Dye‐Sensitized Solar Cells

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