Highly Efficient Light-Harvesting Ruthenium Sensitizer for Thin-Film Dye-Sensitized Solar Cells

Chen, Chia Yuan; Wang, Mingkui; Li, Jheng Ying; Pootrakulchote, Nuttapol; Alibabaei, Leila; Ngoc-Le, Cevey Ha; Decoppet, Jean David; Tsai, Jia Hung; Grätzel, Carole; Wu, Chun Guey; Zakeeruddin, Shaik M.; Grätzel, Michaël

doi:10.1021/nn900756s

Cited by 1,237 publications

(720 citation statements)

References 34 publications

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“…10), stands out for its conjugated thiophene chains and high molar extinction coefficient, yielding a PCE of 11.5%. 84 The synthetic focus later shifted towards other organic sensitizers, largely driven by the need to produce Ru-free materials in order to bypass not only the limitation of their high cost, but also their usually poor absorption extinction coefficients. Many different organic dyes, such as indolenes, perylenes, squarines, donor-acceptor (D-A) dyes, have been reported over the years, but efficiencies consistently remain in the range of 6-8% 85 with a few exceptions.…”

Section: Organic Dyementioning

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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Section: Organic Dyementioning

confidence: 99%

New generation solar cells: concepts, trends and perspectives

2015

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“…DSSCs based on TiO 2 have been extensively studied and their efficiency reaches as high as 11% [3,4]. ZnO material with a wide-band gap semiconductor is considered as an alternative to TiO 2 for the photoanode in DSSCs.…”

Section: Introductionmentioning

confidence: 99%

Role of Mg doping in the structural, optical, and electrical characteristics of ZnO-based DSSCs

Polat¹,

Yılmaz²,

Tomakin³

et al. 2017

Turk J Phys

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ZnO-and Mg-doped ZnO samples are prepared by spray pyrolysis on conducting glass substrates to fabricate ZnO-based dye-sensitized solar cells (DSSCs). Influences of Mg-doping content on the power conversion efficiencies of ZnO-based DSSCs are investigated. X-ray diffraction results show that all the samples exhibit a hexagonal wurtzite structure. Scanning electron microscopy data indicate that the ZnO sample has uniform rods with 1 µ m diameter.With respect to ZnO, the band gap value of 4 at.% Mg-doped ZnO samples improves to the value of 3.27 eV and a further increase in Mg level up to 6 at.% gives rise to a decline in the band gap value of 3.22 eV. Photoluminescence measurements illustrate that intensities of the ultraviolet peak and a red luminescence peak take their maximum values for 4 at.% Mg doping. From solar cell performance measurements, the best power conversion efficiency of 0.08% is obtained for the doping amount of 4 at.% Mg.

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“…[5][6][7][8][9] For the sensitizers, it has been reported that Ru(II) metal complexes exhibit superior, double-digit efficiencies under AM 1.5 global illumination. [10][11][12][13][14][15] However, the thiocyanate ligands incorporated in typical Ru(II) sensitizers are believed to provide the weakest bonding of the whole molecule, making the sensitizers and, hence, the as-fabricated solar cells somewhat unstable under excessive thermal stress and/or light soaking. 16 This latent inferiority has triggered studies attempting to replace the thiocyanate ligands of Ru(II) sensitizers with different chelating anions, such as diketonate, 17 picolinate 18 and heteroaromatic cyclometalates, 19,20 among which the cyclometalates seem to be the most promising ancillary ligands.…”

Section: Introductionmentioning

confidence: 99%

Engineering of thiocyanate-free Ru(ii) sensitizers for high efficiency dye-sensitized solar cells

Wang

Ghadiri

et al. 2013

Chem. Sci.

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We synthesized a series of Ru(II) metal complexes TFRS-1, -2, -4, -21, -22 and -24 with a single 4,4 0 -dicarboxylic acid-2,2 0 -bipyridine together with two functionalized pyridyl azolate ancillary ligands consisting of pyrazolate or triazolate groups. Both photophysical measurements and DFT/TDDFT calculations were conducted to gain insight into their electronic and optical properties. The triazolate series of sensitizers TFRS-21, -22 and -24 showed an enlarged optical band gap with respect to their pyrazolate counterparts TFRS-1, -2 and -4. When employed in dye sensitized solar cells (DSCs), the triazolate sensitizers show slightly inferior J SC values due to the poor incident photon-to-current conversion efficiencies recorded compared to the pyrazolate series. Moreover, the endowed 5-(hexylthio)thiophen-2-yl substituents exert a notable hyperchromic effect and bathochromic shift in the absorption spectra, which then improves the short circuit current J SC to 18.7 and 15.5 mA cm À2 and the overall conversion efficiency to h ¼ 10.2% and 8.25% for TFRS-4 and TFRS-24, respectively. For the evaluation of V OC , transient photocurrent and photovoltage decay measurements were carried out to compare the rates of interfacial recombination of electrons from the TiO 2 conduction band to electrolyte.

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Highly Efficient Light-Harvesting Ruthenium Sensitizer for Thin-Film Dye-Sensitized Solar Cells

Cited by 1,237 publications

References 34 publications

New generation solar cells: concepts, trends and perspectives

New generation solar cells: concepts, trends and perspectives

Role of Mg doping in the structural, optical, and electrical characteristics of ZnO-based DSSCs

Engineering of thiocyanate-free Ru(ii) sensitizers for high efficiency dye-sensitized solar cells

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