Dye‐Sensitized Solar Cells based on Organic Dual‐Channel Anchorable Dyes with Well‐Defined Core Bridge Structures

Seo, Kang Deuk; You, Ban Seok; Choi, In Taek; Ju, Myung Jong; You, Mi; Kang, Hong Seok; Kim, Hwan Kyu

doi:10.1002/cssc.201300365

Cited by 27 publications

(12 citation statements)

References 36 publications

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“…Under the same conditions, DSSC based on D21L6 shows inferior conversion efficiencies of 5.33% with relatively lower J SC (12.11 mA/cm 2 ) and V OC (0.71 V). Moreover, the dyes have much higher efficiency than those previously reported for D21L6 -based dual-anchoring dyes DC1 – DC5 . − …”

Section: Resultsmentioning

confidence: 73%

“…Notably, based on D21L6 , a few of dianchor-type examples have been reported where the phenylamine units are bridged through different π-conjugates ( DC1–DC5 ; see Figure ). − Unfortunately, these dianchor dyes suffered inferior efficiency, compared to that of the parent D21L6 , because of severe aggregation and poor dye loading. In this work, we report two new dianchoring dyes where two D−π–A ( D21L6) units were directly connected, either through phenylene or thiophene, designated as BPDTA and BTTA , respectively (see Figure ).…”

Section: Introductionmentioning

confidence: 99%

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Highly Twisted Dianchoring D−π–A Sensitizers for Efficient Dye-Sensitized Solar Cells

Kumar

Chou

et al. 2016

ACS Appl. Mater. Interfaces

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Two new organic dyes-BPDTA and BTTA-possessing dual D-π-A units have been synthesized, characterized, and employed as efficient sensitizers for dye-sensitized solar cells. The two individual D-π-A, which are based on (E)-3-(5'-(4-(bis(4-(hexyloxy)phenyl)amino)phenyl)-[2,2'-bithiophen]-5-yl)-2-cyanoacrylic acid unit (D21L6), are connected directly between phenylene or thiophene within linear π-conjugated backbone to constitute a highly twisted architecture for suppressing the dye aggregation. The new dianchoring dyes exhibited pronounced absorption profile with higher molar extinction coefficient, which is consistent with the results obtained from density functional theory (DFT) calculations. The theoretical analysis also indicated that the charge transfer transition is mainly constituted of HOMO/HOMO-1 to LUMO/LUMO+1 that were found to be located on donor and acceptor segments, respectively. Theoretical calculations give the distance between two binding sites of 19.50 Å for BPDTA and 12.04 Å for BTTA. The proximity between two anchoring units of BTTA results in superior dye loading and, hence, higher cell efficiency. The BTTA-based device yielded an optimized efficiency of 6.86%, compared to 6.61% for the BPDTA-based device, whereas the model sensitizer D21L6 only delivered an inferior performance of 5.33% under similar conditions. Our molecular design strategy thus opens up a new horizon to establish efficient dianchoring dyes.

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Section: Resultsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Highly Twisted Dianchoring D−π–A Sensitizers for Efficient Dye-Sensitized Solar Cells

Kumar

Chou

et al. 2016

ACS Appl. Mater. Interfaces

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“…However, 1a exhibited unusually high performance with respect to its surface loading. Even dyes of much more complex structure and characterized by similar surface loading did not show such a high efficiency [48,49]. Moreover, the dyes of similar structure equipped with hydantoin, 2,4-thiazolidinedione, and rhodanine-3-acetic acid acceptor groups showed inferior performance relative to 1a [32,50].…”

Section: Photovoltaic Propertiesmentioning

confidence: 95%

2-Thiohydantoin Moiety as a Novel Acceptor/Anchoring Group of Photosensitizers for Dye-Sensitized Solar Cells

et al. 2020

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Very recently, we have reported the synthesis and evaluation of biological properties of new merocyanine dyes composed of triphenylamine moiety, π-aromatic spacer, and rhodanine/2-thiohydantoin-based moiety. Interestingly, 2-thiohydantoin has never been studied before as an electron-accepting/anchoring group for the dye-sensitized solar cells (DSSCs). In the presented study, we examined the applicability of 2-thiohydantoin, an analog of rhodanine, in DSSC technology. The research included theoretical calculations, electrochemical measurements, optical characterization, and tests of the solar cells. As a result, we proved that 2-thiohydantoin might be considered as an acceptor/anchoring group since all the compounds examined in this study were active. The most efficient device showed power conversion efficiency of 2.59%, which is a promising value for molecules of such a simple structure. It was found that the cells’ performances were mainly attributed to the dye loading and the ICT molecular absorption coefficients, both affected by the differences in the chemical structure of the dyes. Moreover, the effect of the aromatic spacer size and the introduction of carboxymethyl co-anchoring group on photovoltaic properties was observed and discussed.

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“…We similarly found the substituents at the nitrogen atom of phenothiazine-cored dyes of the (D(-π-A) 2 ) (D = phenoxazine) kind have a profound effect on the cell performance [6,21,26], such as light-harvesting, dye aggregation, and dark current, and the maximum cell efficiency was compared with that of the N719-based standard cell. Hence, there are a growing number of reports on dyes with two-anchoring groups in fresh years [27][28][29][30][31][32][33]. These D(-π-A) 2 dyes show an interesting phenomenon that not only displays better light-harvesting ability but also provides efficient electron extraction compared to the congeners with only one anchor.…”

Section: Introductionmentioning

confidence: 99%

Effect of π-Conjugated Spacer in N-Alkylphenoxazine-Based Sensitizers Containing Double Anchors for Dye-Sensitized Solar Cells

Yen

Indumathi

2021

Polymers

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A series of novel double-anchoring dyes for phenoxazine-based organic dyes with two 2-cyanoacetic acid acceptors/anchors, and the inclusion of a 2-ethylhexyl chain at the nitrogen atom of the phenoxazine that is connected with furan, thiophene, and 3-hexylthiophene as a linker, are used as sensitizers for dye-sensitized solar cells. The double-anchoring dye exhibits strong electronic coupling with TiO2, provided that there is an efficient charge injection rate. The result showed that the power conversion efficiency of DP-2 with thiophene linker-based cell reached 3.80% higher than that of DP-1 with furan linker (η = 1.53%) under standard illumination. The photovoltaic properties are further tuned by co-adsorption strategy, which improved power conversion efficiencies slightly. Further molecular theoretical computation and electrochemical impedance spectroscopy analysis of the dyes provide further insight into the molecular geometry and the impact of the different π-conjugated spacers on the photophysical and photovoltaic performance.

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Dye‐Sensitized Solar Cells based on Organic Dual‐Channel Anchorable Dyes with Well‐Defined Core Bridge Structures

Cited by 27 publications

References 36 publications

Highly Twisted Dianchoring D−π–A Sensitizers for Efficient Dye-Sensitized Solar Cells

Highly Twisted Dianchoring D−π–A Sensitizers for Efficient Dye-Sensitized Solar Cells

2-Thiohydantoin Moiety as a Novel Acceptor/Anchoring Group of Photosensitizers for Dye-Sensitized Solar Cells

Effect of π-Conjugated Spacer in N-Alkylphenoxazine-Based Sensitizers Containing Double Anchors for Dye-Sensitized Solar Cells

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