Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers

Yum, Jun‐Ho; Jang, Song-Rim; Walter, Pablo; Geiger, Thomas; Nüesch, Frank; Kim, Sang-Hoon; Ko, Jaejung; Grätzel, Michaël; Nazeeruddin, Mohammad Khaja

doi:10.1039/b710759e

Cited by 212 publications

(136 citation statements)

References 12 publications

(10 reference statements)

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“…A large body of research has been conducted to enhance the light harvesting efficiency in TiO 2 photoanodes. In this context, the development of more efficient dye sensitizers, including organic dyes with a higher extinction coefficient 5,6 and energy-relay dyes, 7 and their effective utilization methods, such as cocktail dye 8,9 and selective dye adsorption 10,11 concepts, have prevailed. In addition, the introduction of a scattering layer and inverse opal nanostructures are also common.…”

Section: Introductionmentioning

confidence: 99%

Plasmon-enhanced photocurrent in quasi-solid-state dye-sensitized solar cells by the inclusion of gold/silica core–shell nanoparticles in a TiO2 photoanode

et al. 2013

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Direct evidence of the effects of the localized surface plasmon resonance (LSPR) of gold nanoparticles (Au NPs) in TiO 2 photoanodes on the performance enhancement in quasi-solid-state dye-sensitized solar cells (DSCs) is reported by comparing gold/silica core-shell nanoparticles (Au@SiO 2 NPs) and hollow silica nanoparticles with the same shell size of the core-shell nanoparticles. The Au nanoparticles were shelled by a thin SiO 2 layer to produce the core-shell structure, and the SiO 2 hollow spheres were made by dissolving the Au cores of the gold/silica core-shell nanoparticles. Therefore, the size and morphology of the SiO 2 hollow spheres were the same as the Au@SiO 2 NPs. The energy conversion efficiency was improved nearly 36% upon incorporating the Au nanoparticles, mostly due to the increase in J sc , while V oc and FF were unchanged. The improvement was mostly contributed by the LSPR of the Au@SiO 2 NPs, whereas the other parameters, such as the electron lifetime and electron diffusion coefficient, were nearly unchanged. Therefore, LSPR is an effective tool in improving the photocurrent and consequently the performance of DSCs.

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Section: Introductionmentioning

confidence: 99%

Plasmon-enhanced photocurrent in quasi-solid-state dye-sensitized solar cells by the inclusion of gold/silica core–shell nanoparticles in a TiO2 photoanode

et al. 2013

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“…Yum et al have demonstrated efficiencies of 7.43% and respectable absorbances in the red/near IR region using cells cosensitized with JK2 and SQ1, both organic, non-porphyrin molecules ( Figure 8). JK2 and SQ1 have impressive molar absorption coefficients of 4.2 x 10 4 M -1 cm -1 at 452 nm and 15.9 x 10 4 M -1 cm -1 at 636 nm, respectively (Yum et al, 2007). Advanced dye engineering has produced superior organic dyes.…”

Section: Fully Organic Dyesmentioning

confidence: 99%

Investigating New Materials and Architectures for Grätzel Cells

Polizzotti¹,

Schual-Berke²,

Falsgraf³

et al. 2012

Third Generation Photovoltaics

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“…Additionally, they have a large molar extinction coefficient in the red-shifted region 18,26,29,36,37 or around 400 nm to compensate for the light-harvest loss by electrolytes (I…”

Section: -39mentioning

confidence: 99%

“…Many co-sensitization systems have been proposed and demonstrated improved photovoltaic performance, such as ruthenium complex co-sensitized with an organic dye, 17-26 porphyrin 27-30 or phtalocyanine [31][32][33][34] co-sensitized with an organic dye, and organic dye co-sensitized with another organic dye. [35][36][37][38][39][40] The co-sensitizers generally have a suitable molecular structure to avoid competitive adsorption and effectively suppress dye aggregation.…”

Section: Introductionmentioning

confidence: 99%

Co-sensitization of N719 with an Organic Dye for Dye-sensitized Solar Cells Application

Wu¹,

Wei²,

Chen³

et al. 2014

Bulletin of the Korean Chemical Society

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The co-sensitization of N719 with a cyclic thiourea functionalized organic dye, coded AZ5, for dye-sensitized solar cells (DSSCs) was demonstrated. Due to its intensive absorption in ultraviolet region, AZ5 could compensate the loss of light harvest induced by triiodide, thereby the short-circuit photocurrent density (J sc ) was increased for co-sensitized (N719+AZ5) DSSC. Moreover, the electron recombination and dye aggregation were retarded upon N719 cocktail co-sensitized with AZ5, thus the open-circuit voltage (V oc ) of co-sensitized device was enhanced as well. The increased J sc (17.9 mA·cm −2 ) combined with the enhanced V oc (698 mV) ultimately resulted in an improved power conversion efficiency (PCE) of 7.91% for co-sensitized DSSC, which was raised by 8.6% in comparison with that of N719 (PCE = 7.28%) sensitized alone. In addition, co-sensitized DSSC exhibited a better stability than that of N719 sensitized device probably due to the depression of dye desorption.

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Efficient co-sensitization of nanocrystalline TiO2 films by organic sensitizers

Cited by 212 publications

References 12 publications

Plasmon-enhanced photocurrent in quasi-solid-state dye-sensitized solar cells by the inclusion of gold/silica core–shell nanoparticles in a TiO2 photoanode

Plasmon-enhanced photocurrent in quasi-solid-state dye-sensitized solar cells by the inclusion of gold/silica core–shell nanoparticles in a TiO2 photoanode

Investigating New Materials and Architectures for Grätzel Cells

Co-sensitization of N719 with an Organic Dye for Dye-sensitized Solar Cells Application

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