A High‐Efficiency Panchromatic Squaraine Sensitizer for Dye‐Sensitized Solar Cells

Shi, Yanrong; Hill, R.; Yum, Jun‐Ho; Dualeh, Amalie; Barlow, Stephen; Grätzel, Michaël; Marder, Seth R.; Nazeeruddin, Mohammad Khaja

doi:10.1002/ange.201101362

Cited by 55 publications

(54 citation statements)

References 18 publications

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“…[52] Shi et al examined as implified derivativeo fR SQ2 with at hiophene in place of the BDT p-bridge( YR6). [53] Devices based on YR6 show an IPCE response with a7 80 nm onset across ab road range of wavelengths to yield aPCE of 6.7 %. The observed blue-shift indicatesasignificant role for the p-bridgew ithin the SQ-p-A dye design in controlling IPCE response breadth.…”

Section: Metal-free Sensitizersmentioning

confidence: 99%

Near‐Infrared‐Absorbing Metal‐Free Organic, Porphyrin, and Phthalocyanine Sensitizers for Panchromatic Dye‐Sensitized Solar Cells

2017

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Dye‐sensitized solar cells (DSCs) are a promising source of renewable energy. However, the power conversion efficiency (PCE) of devices has been limited largely by the difficulty of producing electricity using photons from the near‐infrared (NIR) spectral region. Metal‐free organic sensitizers frequently employ strong electron‐donating or ‐withdrawing moieties to tune the optical band gap to allow the absorption of lower energy wavelengths in charge‐transfer systems, whereas porphyrins and phthalocyanines use substituents to shift the Soret and Q bands toward lower energy absorption. Very few devices employing precious metal‐free dyes have achieved panchromatic and NIR photon conversion for electricity generation at wavelengths >750 nm despite a tremendous number of sensitizers published over the last 25 years. This Minireview seeks to compile a summary of these sensitizers to encourage assimilation, analysis, and development of efficient future sensitizers with absorption extending into the NIR. Herein, we discuss common synthetic strategies, optical properties, and electronic properties of the most successful panchromatic organic sensitizers.

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Section: Metal-free Sensitizersmentioning

confidence: 99%

Near‐Infrared‐Absorbing Metal‐Free Organic, Porphyrin, and Phthalocyanine Sensitizers for Panchromatic Dye‐Sensitized Solar Cells

2017

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“…The dye is a crucial component of DSSCs, greatly influencing the power conversion efficiency and stability of the device [4,5]. Several metal-free organic dyes, including triarylamine dyes [6][7][8][9][10][11], coumarin dyes [12][13][14][15][16], carbazole dyes [17][18][19][20][21], indoline dyes [22][23][24][25], heteroanthracene dyes [26][27][28], tetrahydroquinoline dyes [29,30], N,N-dialkylaniline dyes [31][32][33][34], merocyanine dyes [35,36], hemicyanine dyes [37,38], squarine dyes [39][40][41], perylene dyes [42,43], anthraquinone dyes [44], oligothiophene dyes [45], and boradiazaindacene (BODIPY) dyes [46][47][48], have been tested in DSSCs. These metal free organic dyes are commonly designed in the donor-π-conjugation-acceptor (D-π-A) configuration.…”

Section: Introductionmentioning

confidence: 99%

Investigation of novel anthracene-bridged carbazoles as sensitizers and Co-sensitizers for dye-sensitized solar cells

Mallam

Elbohy

Qiao

et al. 2015

Int. J. Energy Res.

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Summary Novel anthracene‐bridged carbazole organic dyes (designated ML4 and ML5) were synthesized using the Suzuki coupling reaction. These dyes were designed to be donor‐π‐conjugation‐acceptor sensitizers for dye‐sensitized solar cells, where the carbazole moiety acts as the donor, the anthracene moiety provides the π‐conjugation, and the cyano acrylic acid acts as the acceptor. Solar cells were fabricated with ML4 and ML5 alone with low power conversion efficiencies, but they were also used as co‐sensitizers with N719, improving the efficiency of the dye‐sensitized solar cells produced by ~3% and ~10%, respectively. Copyright © 2015 John Wiley & Sons, Ltd.

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“…Recently, Ko [5] and Marder [6] independently reported several panchromatic squaraine sensitizers, which yielded relatively high power conversion efficiencies (PCEs) (6.29 % and 6.74 %) under AM 1.5 G irradiation. However, both displayed low IPCE values (< 70 %) from in the wavelength range 400-770 nm.…”

mentioning

confidence: 99%

“…Improving the absorption of solar light in this region is one of the main directions in aiming for DSC efficiencies beyond 15 %. Near-IR sensitizers are also of interest because of their potential applications in transparent solar cells for windows and tandem cells.When used in DSCs, near-IR dyes reported in the literature, such as squaraines, [4][5][6] zinc phthalocyanines [7][8][9][10] and perylene dyes, [11][12][13] normally show low incident-photon-to-current conversion efficiency (IPCE) values and poor stability compared to donorp spacer-acceptor (D-p-A) organic dyes. Recently, Ko [5] and Marder [6] independently reported several panchromatic squaraine sensitizers, which yielded relatively high power conversion efficiencies (PCEs) (6.29 % and 6.74 %) under AM 1.5 G irradiation.…”

mentioning

confidence: 99%

Molecular Design to Improve the Performance of Donor–π Acceptor Near‐IR Organic Dye‐Sensitized Solar Cells

Hao¹,

Yang²,

Zhou³

et al. 2011

ChemSusChem

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Since Grätzel and O'Brian first reported dye-sensitized solar cells (DSCs) in 1991, much effort has been devoted towards improving their energy conversion efficiency. [1][2][3] Recently, the design and synthesis of infrared/near-infrared (IR/near-IR)-dyes has become an important topic in the area of solar cells since it has been recognized that the solar spectrum has a large photon flux in the region of 500-1000 nm. Improving the absorption of solar light in this region is one of the main directions in aiming for DSC efficiencies beyond 15 %. Near-IR sensitizers are also of interest because of their potential applications in transparent solar cells for windows and tandem cells.When used in DSCs, near-IR dyes reported in the literature, such as squaraines, [4][5][6] zinc phthalocyanines [7][8][9][10] and perylene dyes, [11][12][13] normally show low incident-photon-to-current conversion efficiency (IPCE) values and poor stability compared to donorp spacer-acceptor (D-p-A) organic dyes. Recently, Ko [5] and Marder [6] independently reported several panchromatic squaraine sensitizers, which yielded relatively high power conversion efficiencies (PCEs) (6.29 % and 6.74 %) under AM 1.5 G irradiation. However, both displayed low IPCE values (< 70 %) from in the wavelength range 400-770 nm. Also, although a promising PCE of 4.6 % was achieved in a DSC based on a structurally related zinc phthalocyanine by Taya and co-workers, [9] the highest IPCE value was only 80 % at 680 nm.Recently, novel D-p-A organic dyes with two features were reported: new chromophores for sensitization in the near-IR region and new design of the anchoring group. [14] Compared to conventional D-p-A dyes (that use cyanoacrylic acid as acceptor and anchoring group), the anchoring group in these dyes was separated from the acceptor units. This change allowed tuning of the highest occupied-lowest unoccupied molecular orbital (HOMO-LUMO) levels (absorption spectra) in an easier way, through modifying the structure of the acceptor units. By adopting this strategy, we succeeded for the first time in extending the absorption spectra of D-p-A sensitizers for DSCs to the near-IR region. In particular, the dye HY103 gave a maximum IPCE of 86 % at 660 nm and an overall solarenergy-to-electricity conversion efficiency (h) of 3.7 %. The low open-circuit voltage (464 mV) limited its photovoltaic performance.To improve this system, we report a novel D-p-A organic dye with a lateral anchoring group: HY113. In HY113, a flexible, long carbon chain replaces the methyl group of the donor part of HY103. The aim of the present work is to make use of this carbon chain to prevent the formation of molecular aggregates on the semiconductor nanoparticles, thereby blocking charge recombination at relatively high open-circuit voltages and short-circuit photocurrent densities. HY113 performed impressively, with a maximum IPCE of 93 % at 660 nm and an overall solar-energy-to-electricity conversion efficiency of 5.1 %; the highest IPCE value in the near-IR region and the highest ...

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A High‐Efficiency Panchromatic Squaraine Sensitizer for Dye‐Sensitized Solar Cells

Cited by 55 publications

References 18 publications

Near‐Infrared‐Absorbing Metal‐Free Organic, Porphyrin, and Phthalocyanine Sensitizers for Panchromatic Dye‐Sensitized Solar Cells

Near‐Infrared‐Absorbing Metal‐Free Organic, Porphyrin, and Phthalocyanine Sensitizers for Panchromatic Dye‐Sensitized Solar Cells

Investigation of novel anthracene-bridged carbazoles as sensitizers and Co-sensitizers for dye-sensitized solar cells

Molecular Design to Improve the Performance of Donor–π Acceptor Near‐IR Organic Dye‐Sensitized Solar Cells

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