Solid-state dye-sensitized mesoporous TiO2 solar cells with high photon-to-electron conversion efficiencies

Bach, Udo; Lupo, Donald; Comte, Pascal; Moser, Jacques‐E.; Weissörtel, F.; Salbeck, Josef; Spreitzer, Hubert; Grätzel, Michaël

doi:10.1038/26936

Cited by 3,435 publications

(2,328 citation statements)

References 15 publications

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“…It has been known that if the oxidation cocatalyst is deposited on the oxidation sites of the photoelectrode, the photoanode currents can be increased because hole trapping on the oxidation cocatalyst can lead to better charge separation [51][52][53][54][55] . Indeed, our photoelectrochemical measurements show that the photoanode current was remarkably enhanced when the MnO x was selectively photo-deposited on the hole-concentrated {110} facets of BiVO 4 (Fig.…”

Section: Discussionmentioning

confidence: 99%

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

et al. 2013

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Charge separation is crucial for increasing the activity of semiconductor-based photocatalysts, especially in water splitting reactions. Here we show, using monoclinic bismuth vanadate crystal as a model photocatalyst, that efficient charge separation can be achieved on different crystal facets, as evidenced by the reduction reaction with photogenerated electrons and oxidation reaction with photogenerated holes, which take place separately on the {010} and {110} facets under photo-irradiation. Based on this finding, the reduction and oxidation cocatalysts are selectively deposited on the {010} and {110} facets respectively, resulting in much higher activity in both photocatalytic and photoelectrocatalytic water oxidation reactions, compared with the photocatalyst with randomly distributed cocatalysts. These results show that the photogenrated electrons and holes can be separated between the different facets of semiconductor crystals. This finding may be useful in semiconductor physics and chemistry to construct highly efficient solar energy conversion systems.

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Section: Discussionmentioning

confidence: 99%

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

et al. 2013

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“…renewable power. Research by Grätzel et al [1], Heeger et al [2], and others [3][4][5] has produced a variety of successful solar cell designs using nanometre scale blends or interpenetrating systems. While most of the nanostructured solar cell designs use dye/electrolyte couples and/or organic materials, inorganic designs are desirable to obviate leakage, sealing, and degradation concerns.…”

Section: Introductionmentioning

confidence: 99%

A parametric study of TiO₂/CuInS₂nanocomposite solar cells: how cell thickness, buffer layer thickness, and TiO₂particle size affect performance

et al. 2007

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Abstract3D CuInS 2 /TiO 2 nanocomposite solar cell performance is strongly influenced by several structural factors, including cell thickness, buffer layer thickness, and the morphology of the TiO 2 nanoparticulate matrix. To delineate the effect of these structural factors on photovoltaic performance, a series of parametric studies are performed where a single structural parameter is varied (TiO 2 nanoparticulate matrix thickness, In 2 S 3 buffer layer thickness, or TiO 2 particle size) while all other fabrication conditions are held constant. The best overall performance (3.0% efficiency at AM 1.5) is achieved from a device with TiO 2 matrix thickness ≈200 nm, In 2 S 3 buffer layer thickness ≈60 nm, and TiO 2 nanoparticulate size = 300 nm. Notably, the film thickness in the best-performing cell (200 nm) is less than the TiO 2 particle size (300 nm), corresponding to a discontinuous nanoparticulate film. Thicker TiO 2 nanoparticulate films or smaller TiO 2 particles sizes lead to decreased performance due to increased charge transport resistance. However, the performance from a planar cell (where the TiO 2 nanoparticulate layer is not used) is inferior to the performance from the better-optimized 3D cells, indicating that some degree of nanostructuring improves performance. Device performance is also observed to depend strongly on In 2 S 3 buffer layer thickness, with optimal performance achieved for a buffer layer thickness of approximately 60 nm. The optimal buffer layer thickness is governed by two opposing factors: increasing the buffer layer thickness improves the interfacial characteristics (as measured by decreasing leakage conductance, G) but also screens the incoming light and causes an increase in the charge transport resistance (as measured by the cell series resistance, R s ).

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“…Several organic and inorganic materials have been proposed as hole-transporters, with the highest V OC values being obtained in devices that employ a small-molecule hole conductor. 110 The bestperforming HTM is triphenylamine-based spiro-MEOTAD 111 ( Fig. 13) in organic-based materials, giving an overall efficiency of 7.2% when paired with Y123 dye (Fig.…”

Section: Liquid Electrolytes Versus Solid Hole Transporting Materialsmentioning

confidence: 99%

New generation solar cells: concepts, trends and perspectives

2015

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Organic, dye-sensitized and perovskite solar cell technologies have triggered widespread interest in recent years due to their very promising potential towards a high solar electricity future. A number of important milestones have marked the roadmap of each sector on the way to today's outstanding performances, but there still remains plenty of scope for further improvement. The most influential landmarks, together with basic concepts and future perspectives are unraveled in this review.

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Solid-state dye-sensitized mesoporous TiO2 solar cells with high photon-to-electron conversion efficiencies

Cited by 3,435 publications

References 15 publications

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

A parametric study of TiO₂/CuInS₂nanocomposite solar cells: how cell thickness, buffer layer thickness, and TiO₂particle size affect performance

New generation solar cells: concepts, trends and perspectives

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Solid-state dye-sensitized mesoporous TiO2 solar cells with high photon-to-electron conversion efficiencies

Cited by 3,435 publications

References 15 publications

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4

A parametric study of TiO2/CuInS2nanocomposite solar cells: how cell thickness, buffer layer thickness, and TiO2particle size affect performance

New generation solar cells: concepts, trends and perspectives

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A parametric study of TiO₂/CuInS₂nanocomposite solar cells: how cell thickness, buffer layer thickness, and TiO₂particle size affect performance