Synthesis and characterization of diporphyrin sensitizers for dye-sensitized solar cells

Mai, Chi‐Lun; Huang, Wei‐Kai; Lu, Hsueh-Pei; Lee, Cheng-Wei; Chiu, Chien‐Lan; Liang, You-Ren; Diau, Eric Wei‐Guang; Yeh, Chen‐Yu

doi:10.1039/b917316a

Cited by 126 publications

(65 citation statements)

References 34 publications

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“…Table 1 summarizes recently published data for dimer sensitised solar cells. [22][23][24][25][26] As expected, using conjugated linkers results in the enhancement of the absorption spectrum, while it seems to result in the decrease of V oc . On the other hand, dimer sensitisers using nonconjugated linkers showed higher V oc than monomer sensitisers.…”

Section: Introductionsupporting

confidence: 67%

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: Introductionsupporting

confidence: 67%

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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“…However, the absorption wavelength values of the porphyrin dye did not reach the near IR region and the existence of a gap between the Soret and Q bands in monomeric porphyrins limits their cell performance. The more successful way to overcome this limit is to connect more porphyrin dyes through their meso and beta peripheral positions [4]. Different approaches have been followed to reach this goal, such as for example the preparation of expanded porphyrinoids [5], where the aromatic system spans over a macrocycle larger than that of porphyrins.…”

Section: Introductionmentioning

confidence: 99%

β-Pyrazino-fused tetrarylporphyrins

et al. 2013

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“…These dyad structures demonstrate remarkable absorbance values in solution with many reaching onsetso f8 00 nm with one reaching 1200 nm in solution and exhibiting e of 100 000 Lmol À1 cm À1 . Mai et al found that increasing interporphyrin interactions througha ne thynyl-linker red-shifts absorbance onsetsi ns olution and gives rise to ap anchromatic IPCE response up to 850 nm and PCEs up to 4.1 %( YDD0) [77] However,o wing to a stabilized excited-state energy level,e lectron injection was found to be problematic for YDD0. Wu et al synthesized an alkoxy-wrapped ethynyl-linked porphyrin dyad, which exhibited av ery broad IPCE response (onset at 900 nm) and ap eak value of 35 %( YDD6).…”

Section: Porphyrin-based Photosensitizersmentioning

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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Synthesis and characterization of diporphyrin sensitizers for dye-sensitized solar cells

Abstract: Novel porphyrin dimers with broad and strong absorption in the visible and/or near IR regions have been synthesized; the meso-meso-linked porphyrin dimer (YDD1) exhibited the best photovoltaic performance with power conversion efficiency 5.2% under AM 1.5G one solar illumination.

Cited by 126 publications

References 34 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

β-Pyrazino-fused tetrarylporphyrins

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

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