Zn−Zn Porphyrin Dimer-Sensitized Solar Cells: Toward 3-D Light Harvesting

Mozer, Attila J.; Griffith, Matthew J.; Tsekouras, George; Wagner, Paweł; Wallace, Gordon G.; Mori, Shogo; Sunahara, Kenji; Miyashita, Masanori; Earles, John C.; Gordon, Keith C.; Du, Luchao; Katoh, Ryuzi; Furube, Akihiro; Officer, David L.

doi:10.1021/ja9057713

Cited by 180 publications

(130 citation statements)

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“…The trend of the V oc was the same to what we reported previously. [27] Comparable values of J sc from both the dimer and monomer DSSCs at optimized cells are expected because the range of their respective absorption spectra is the same. However, we note that more than 80 % IPCE from the dimer DSSCs was quite unexpected, as the dimer was made by connecting two monomers having similar LUMO levels and the bridge was not conjugated.…”

Section: Optimising Device Fabrication Conditions For Dimer-sensitisementioning

confidence: 99%

“…We have shown previously that both the monomer and dimer examined here suffer from sub-nanosecond charge recombination. [27] Thus, the increased IPCE using CDCA is probably caused by the retardation of the fast recombination with dye cations. [a] Concentration ratio in dye bath.…”

Section: Optimising Device Fabrication Conditions For Dimer-sensitisementioning

confidence: 99%

“…[27] DSC Fabrication. TiO 2 films were prepared on fluorine-doped tin oxide (FTO) substrates (Nippon Sheet Glass, R s ≤ 9.5 Ω sq -1 ) using a doctor-blade technique and were sintered at 550°C for 30 minutes in air.…”

Section: Introductionmentioning

confidence: 99%

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A Nonconjugated Bridge in Dimer-Sensitized Solar Cells Retards Charge Recombination without Decreasing Charge Injection Efficiency

Sunahara

Griffith

Uchiyama

et al. 2013

ACS Appl. Mater. Interfaces

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A nonconjugated bridge in dimer-sensitized solar cells retards charge recombination without decreasing charge injection efficiency AbstractDye sensitized solar cells (DSSCs) employing a dimer porphyrin, which was synthesised with two porphyrin units connected without conjugation, have shown that both porphyrin components can contribute to photocurrent generation, that is, more than 50 % internal quantum efficiency. In addition, the open-circuit voltage (Voc) of the DSSCs was higher than that of DSSCs using monomer porphyrins. In this paper, we first optimized cell structure and fabrication conditions. We obtained more than 80% incident photon to current conversion efficiency from the dimer porphyrin sensitized DSSCs and higher Voc and energy conversion efficiency than monomer porphyrin sensitized solar cells. To examine the origin of the higher Voc, we measured electron lifetime in the DSSCs with various conditions, and found that the dimer system increased the electron lifetime by improving the steric blocking effect of the dye layer, whilst the lack of a conjugated linker prevents an increase in the attractive force between conjugated sensitizers and the acceptor species in the electrolyte. The results support a hypothesis; dispersion force is one of the factors influencing the electron lifetime in DSSCs. ABSTRACTDye sensitised solar cells (DSSCs) employing a dimer porphyrin, which was synthesised with two porphyrin units connected without conjugation, have shown that both porphyrin components can contribute to photocurrent generation, that is, more than 50 % incident photon to current conversion (IPCE) efficiency. In addition, the open-circuit voltage (V oc ) of the DSSCs was higher than that of DSSCs using monomer porphyrins. In this paper, we first optimized cell structure and fabrication conditions and obtained more than 80 % IPCE from the dimer porphyrin sensitized DSSCs and higher V oc and energy conversion efficiency than monomer porphyrin sensitized solar cells. In order to examine the origin of the higher V oc , we measured electron lifetime in the DSSCs with various conditions, and found that the dimer system increased the electron lifetime by improving the steric blocking effect of the dye layer, whilst the lack of a conjugated linker prevents an increase in the attractive force between conjugated sensitisers and the acceptor species in the electrolyte. The results support a hypothesis; dispersion forces are one of the factors influencing the electron lifetime in DSSCs.

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Section: Optimising Device Fabrication Conditions For Dimer-sensitisementioning

confidence: 99%

Section: Optimising Device Fabrication Conditions For Dimer-sensitisementioning

confidence: 99%

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A Nonconjugated Bridge in Dimer-Sensitized Solar Cells Retards Charge Recombination without Decreasing Charge Injection Efficiency

Sunahara

Griffith

Uchiyama

et al. 2013

ACS Appl. Mater. Interfaces

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“…In this type of solar cell the properties of the dye, such as colour, molecular extinction coeffi-cient and robustness under illumination, are of utmost importance. Among the examples of dyes published in the literature [3] for Gratzel€ solar cells, porphyrins [4] have pleasant colours [5], excel-lent molecular extinction coefficients [6,7] and good robustness [8,9]. Moreover, based on the work of Yella and co-workers [1], efficiencies that surpass the values obtained with ruthenium sen-sitizers have been achieved.…”

Section: Introductionmentioning

confidence: 99%

Charge recombination losses in thiophene-substituted porphyrin dye-sensitized solar cells

et al. 2016

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a b s t r a c tTwo new porphyrins that incorporate thiophene substituents as spacers between the conjugated porphyrin core and the anchoring cyanoacrylate group have been synthesised. The two dyes differ in the number of thiophene bridges; porphyrin 1a has only one thiophene group and porphyrin 1b has two thiophene rings connected by a double bond. The measured light-toenergy conversion efficiencies in 1a and 1b were assessed using two different electrolytes, LP1 and LP2, which differ in the presence of tert-butyl pyridine in LP1. An efficiency of 6% under standard measurement conditions has been achieved for 1a þ LP1. However, for porphyrin 1b the use of electrolyte LP1 led to lower efficiencies and a value of approximately 4% was obtained. The differences between the two types of solar cells and the electrolytes have been studied in-depth using photoinduced time-resolved techniques such as CE (Charge Extrac-tion) and TPV (Transient PhotoVoltage).

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“…In view of the light absorption property, the absorption spectrum of the dimer was similar to that of the monomer, and thus the optical benefit of the dimer was a higher absorption coefficient. 17 In this work, we extend the idea of the nonconjugated dye design to obtain not only a longer electron lifetime, but also panchromatic absorption by synthesizing a di-chromophoric dye consisting of porphyrin and organic dye frameworks. We also demonstrate that this di-chromophoric design can be utilized to control the effect of the dispersion force by comparison to individual and mixed monomers.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electron Lifetimes in Dye-Sensitized Solar Cells Using a Dichromophoric Porphyrin: The Utility of Intermolecular Forces

Zhao

Wagner

Salm

et al. 2015

ACS Appl. Mater. Interfaces

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. (2015). Enhanced electron lifetimes in dye-sensitized solar cells using a di-chromophoric porphyrin: the utility of inter-molecular forces. ACS Applied Materials and Interfaces, 7 (39), 22078-22083. Enhanced electron lifetimes in dye-sensitized solar cells using a dichromophoric porphyrin: the utility of inter-molecular forces AbstractElectron lifetimes in dye-sensitized solar cells employing a porphyrin dye, an organic dye, a 1:1 mixture of the two dyes and a di-chromophoric dye design consisting of the two dyes using a non-conjugated linker were measured, suggesting that the dispersion force of the organic dyes has a significant detrimental effect on the electron lifetime and that the di-chromophoric design can be utilized to control the effect of the dispersion force.Keywords electron, lifetimes, dye, sensitized, solar, enhanced, cells, forces, di, chromophoric, porphyrin, utility, inter, molecular Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsZhao, L., Wagner, P., van der Salm, H., Gordon, K. C., Mori, S. & Mozer, A. J. (2015). Enhanced electron lifetimes in dye-sensitized solar cells using a di-chromophoric porphyrin: the utility of inter-molecular forces. ACS Applied Materials and Interfaces, 7 (39), 22078-22083. Just Accepted "Just Accepted" manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides "Just Accepted" as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. "Just Accepted" manuscripts appear in full in PDF format accompanied by an HTML abstract. "Just Accepted" manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). "Just Accepted" is an optional service offered to authors. Therefore, the "Just Accepted" Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the "Just Accepted" Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts. 1Enhanced electron lifetimes in dye-sensitized solar cells using a di-chromophoric porphyrin: the utility of inter-molecular forces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 Electron lifetimes in dye-sensitized solar cells employing a porphyrin dye, an orga...

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Zn−Zn Porphyrin Dimer-Sensitized Solar Cells: Toward 3-D Light Harvesting

Cited by 180 publications

References 22 publications

A Nonconjugated Bridge in Dimer-Sensitized Solar Cells Retards Charge Recombination without Decreasing Charge Injection Efficiency

A Nonconjugated Bridge in Dimer-Sensitized Solar Cells Retards Charge Recombination without Decreasing Charge Injection Efficiency

Charge recombination losses in thiophene-substituted porphyrin dye-sensitized solar cells

Enhanced Electron Lifetimes in Dye-Sensitized Solar Cells Using a Dichromophoric Porphyrin: The Utility of Intermolecular Forces

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