Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

Saccone, Davide; Galliano, S.; Barbero, Nadia; Quagliotto, Pierluigi; Viscardi, Guido; Barolo, Claudia

doi:10.1002/ejoc.201501598

Cited by 89 publications

(75 citation statements)

References 141 publications

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“…With the use of J-aggregates as sensitizers a high lightto-electricity conversion efficiency was achieved [241,242]. It can be enhanced in multi-layer constructions, in which fullerenes or carbon nanotubes mediate the electron transfer from strongly absorbing ultrathin films of J-aggregates [243,244].…”

Section: Applications In Photonic Devicesmentioning

confidence: 99%

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

340

299

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J-aggregates are fascinating fluorescent nanomaterials formed by highly ordered assembly of organic dyes with the spectroscopic properties dramatically different from that of single or disorderly assembled dye molecules. They demonstrate very narrow red-shifted absorption and emission bands, strongly increased absorbance together with the decrease of radiative lifetime, highly polarized emission and other valuable features. The mechanisms of their electronic transitions are understood by formation of delocalized excitons already on the level of several coupled monomers. Cyanine dyes are unique in forming J-aggregates over the broad spectral range, from blue to near-IR. With the aim to inspire further developments, this review is focused on the optical characteristics of J-aggregates in connection with the dye structures and on their diverse already realized and emerging applications.

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Section: Applications In Photonic Devicesmentioning

confidence: 99%

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Bricks

Slominskii

Panas

et al. 2017

Methods Appl. Fluoresc.

340

299

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“…Squaraines (SQs) represent a class of zwitterionic cyanines wherein two electron‐donating subunits are attached to an electron‐deficient cyclobutadione core to form a quadrupolar donor–acceptor–donor structure . Like typical cyanines, they can be easily prepared via a condensation reaction and generally exhibit an intense absorption/emission from the visible to the near infrared (NIR) region .…”

Section: Introductionmentioning

confidence: 99%

“…[2] More importantly, the rigid squarainic bridge in the SQs could prevent the photoisomerization and oxidation of the polymethine chain to effectively enhance the photostability. [1,3] These attracting features therefore make SQs suitable for many optoelectric applications such as biological markers/ sensors, [4] nonlinear optical materials, [5][6][7] light-harvesting materials, [8][9][10][11] and so on.In fact, SQs belong to the first generation of photovoltaic materials, and earlier in 1976, an SQ-based organic solar cell (OSC) has been already reported with an extremely low power conversion efficiency (PCE) of 0.02%. [12] A breakthrough was made in 2008; [13] Marks et al developed a new type of hydrazine end-capped SQs as the donor materials in the bulk heterojunction (BHJ) OSCs, and an encouraging PCE of 1.24% was produced.…”

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confidence: 99%

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confidence: 99%

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Rational Design of 2D p–π Conjugated Polysquaraines for Both Fullerene and Nonfullerene Polymer Solar Cells

Xiao

Han

et al. 2019

Macro Chemistry & Physics

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So far, squaraine‐based polymer donors have been less explored for the bulk heterojunction (BHJ) polymer solar cells. In this work, two new p–π conjugated polysquaraines (PASQ‐BDT1 and PASQ‐BDT2) with different electron‐rich subunits on the squaraine skeleton are rationally developed as new polymer donors based on the 2D structure design concept. PASQ‐BDT2 with N,N‐diisobutylaniline subunits shows superior device performances in both fullerene and nonfullerene PSCs compared to PASQ‐BDT1 containing triphenylamine subunits, with power conversion efficiencies (PCEs) of 4.34% and 3.72%, respectively, owing to increased light‐harvesting ability and more favorable nanoscale morphology in the BHJ films. Moreover, its demonstrated that solvent effects can play an effective role in elevating the device performance. For the PASQ‐BDT2/PC71BM blend, the PCE is improved from 3.19% to 4.34% after solvent vapor annealing treatment, mainly attributed to the optimized film morphology and increased hole mobility. More interestingly, when the processing solvent for nonfullerene devices is changed from chlorobenzene to chloroform, a significant enhancement on PCE from 1.96% to 3.72% is yielded for the PASQ‐BDT2/ITIC blend, due to suppressed charge recombination and enhanced crystallinity in the chloroform‐processed BHJ films.

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“…So far, highest device performance of 13 % and 12.5 % was achieved for phorphyrin and D‐ π ‐A‐ π dyes, respectively phthalocyanines and polymethine dyes have been utilized to harvest the NIR photons. Though the metal free organic dyes show superior light absorbing properties than the ruthenium based dyes, the device performances were lower than that of metal based dyes due to narrow absorption profile and aggregation of dyes on the TiO 2 surface ,,,.…”

Section: Introductionmentioning

confidence: 99%

Homo‐ and Heterodimeric Dyes for Dye‐Sensitized Solar Cells: Panchromatic Light Absorption and Modulated Open Circuit Potential

et al. 2018

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The design of dyes for panchromatic light absorption has attracted much attention in the field of dye‐sensitized solar cells (DSSCs). An approach to enhance panchromatic light absorption utilizes mixtures of complementary light‐absorbing dyes as well as dyes with specific anchoring groups that facilitate interfacial charge transfer with TiO2. Dipole‐dipole interactions between the dye molecules on the surface broaden the spectrum, which results in decreased DSSC device performance. However, controlled aggregation of dyes results in broadening the spectral profile along with enhanced photocurrent generation. To control the dye‐dye interaction, dimeric dyes with different dipole lengths D1‐Dsq, Dsq‐Dsqwere systematically designed and synthesized. The photophysical and electrochemical properties were evaluated and the EHOMO and ELUMO levels were determined; these energy levels determines the electron injection from ELUMO of the dye to ECB of TiO2 and regeneration of oxidized dye by the electrolyte, respectively. The absorption spectra of Dsq‐Dsq, D1‐Dsq were broadened in solution compared to model dye Dsq; this indicates that the dye‐dye interaction is prominent in solution. In D1‐Dsq excitation energy transfer between photoexcited D1 and Dsq was explained by using Förster resonance energy transfer (FRET). The homodimeric dye showed a device performace of 2.8 % (Voc 0.607, Jsc 6.62 mA/cm2, ff 69.3 %),whereas the heterodimeric dye D1‐Dsq showed a device performance of 3.9 % (Voc 0.652 V, Jsc 8.89 mA/cm2, ff 68.8 %). The increased photocurrent for D1‐Dsqis due to the panchromatic IPCE response compared to Dsq‐Dsq. The increased Vocis due to the effective passivation of the TiO2 surface by the spirolinker, and the effective dipole moment that shifts the conduction band on TiO2. Hence, the open circuit potential, Voc, for the devices prepared from Dsq, D1‐Dsq and Dsq‐Dsqwere systematically modulated by controlling the intermolecular π‐π and intramolecular dipole‐dipole interactions of the dimeric dyes.

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Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

Cited by 89 publications

References 141 publications

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

Rational Design of 2D p–π Conjugated Polysquaraines for Both Fullerene and Nonfullerene Polymer Solar Cells

Homo‐ and Heterodimeric Dyes for Dye‐Sensitized Solar Cells: Panchromatic Light Absorption and Modulated Open Circuit Potential

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