High effectiveness of oligothienylenevinylene as molecular wires in Zn-porphyrin and C60 connected systems

Oswald, Frédéric; Islam, Dipa; Araki, Yasuyuki; Troiani, Vincent; Caballero, Rubén; Cruz, Pilar de la; Ito, Osamu; Langa, Fernando

doi:10.1039/b711194k

Cited by 43 publications

(29 citation statements)

References 23 publications

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“…Potassium tert-butoxide (32 mg, 0.30 mmol) was slowly added to a refluxing solution of phosphonate 1 and (120 mg, 0.13 mmol) and bisformyl oligothienylenevinylene tetramer (OHC-4TV-CHO) [20,21] (164 mg, 0.14 mmol) in dry THF (20 mL) under argon atmosphere.…”

Section: Synthesis Of 5-((mentioning

confidence: 99%

Electron Transfer Dynamics in Dye‐Sensitized Solar Cells Utilizing Oligothienylvinylene Derivates as Organic Sensitizers

et al. 2009

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Two new organic dyes have been synthesized and used as efficient light-harvesting materials in molecular photovoltaic devices. These dyes are based on conjugated thienylvinylene units, with FL-4 consisting of a four-unit thienylvinylene oligomer and its homologue FL-7 which additionally incorporates the electron-donating triphenylamine unit (TPA) into its structure. Upon light excitation both dyes show efficient electron injection into the TiO2 conduction band and slow back electron transfer to the oxidized dye. In fact, for FL-7, the back electron transfer dynamics are slower owing to efficient hole transfer to the TPA moiety situated further from the semiconductor surface. However, the electron recombination kinetics with the oxidized electrolyte for both FL-4 and FL-7 in dye-sensitized solar cells are faster than for devices made using the ruthenium dye N719. We believe that this is a serious limiting factor for devices based on oligothiophenes which, despite showing higher molecular extinction coefficients in the vis-NIR region of the solar spectrum, still cannot challenge the light-to-energy conversion efficiency of N719 or other ruthenium polypyridyl complexes.

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Section: Synthesis Of 5-((mentioning

confidence: 99%

Electron Transfer Dynamics in Dye‐Sensitized Solar Cells Utilizing Oligothienylvinylene Derivates as Organic Sensitizers

et al. 2009

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“…Efficient photoinduced electron transfer from nTV to good electron acceptors as C 60 has been previously observed. 23,24 3.2. Photovoltaic Performance of DSC.…”

Section: Methodsmentioning

confidence: 99%

Injection and Recombination in Dye-Sensitized Solar Cells with a Broadband Absorbance Metal-Free Sensitizer Based on Oligothienylvinylene

et al. 2008

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A new metal-free sensitizer for improved light harvesting with dye-sensitized solar cells (DSC) has been synthesized and fully characterized. The molecular sensitizer was engineered by linking the tiophenes groups by methine units, improving light absorption until 760 nm wavelength. In conventional DSC configuration the dye produces short-circuit current density of 13.4 mA/cm 2 at 1.5 AM illumination (100 mW cm -2 ) and the incident photon-to-current conversion efficiency (IPCE) of 58%. The causes for the limitation to the photocurrent are investigated by impedance spectroscopy measurements, and it is shown that metal-based and metal-free molecular sensitizers show distinct characteristics concerning the blocking of the TiO 2 surface with coadsorbents to prevent electron recombination.

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“…In contrast with DSSCs, it has taken quite a while for porphyrins to demonstrate their potential in BHJ solar cells. However, they have been widely studied for their good ability to photo‐transfer electrons to C 60 derivatives . Thus, ultra‐fast electron transfer, and charge Separated (CS) states of several nanoseconds have been observed .…”

Section: Introductionmentioning

confidence: 99%

Porphyrins and BODIPY as Building Blocks for Efficient Donor Materials in Bulk Heterojunction Solar Cells

et al. 2017

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International audienceAdvances in the synthesis and application of highly efficient polymers and small molecules over the last two decades have enabled the rapid advancement in the development of organic solar cells and photovoltaic technology as a promising alternative to conventional solar cells, based on silicon and other inorganic semiconducting materials. Among the different types of organic semiconducting materials, porphyrins and BODIPY-based small molecules and conjugated polymers attract high interest as efficient semiconducting organic materials for dye sensitized solar cells and bulk heterojunction organic solar cells. The highest power conversion efficiency exceeding 9% has been reported so far for porphyrin small molecules and 8.60% for conjugated polymers based on porphyrins. On the other hand, small molecules and conjugated polymers based on BODIPY moiety have been successfully used as donor materials for solution processed bulk heterojunction organic solar cells, and the resultant devices showed power conversion efficiencies exceeding 5.5%. In this article, the development of molecular design of porphyrins and BODIPY small molecules and polymers for bulk heterojunction organic solar cells are reviewed, and a guideline for the structure-performance relationship is provided

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High effectiveness of oligothienylenevinylene as molecular wires in Zn-porphyrin and C60 connected systems

Abstract: Photoinduced energy transfer and electron transfer processes have been found between the excited singlet state of Zn-porphyrin and C(60) via an oligothienylenevinylene bridge depending on the length of the oligothiophene and solvent polarity.

Cited by 43 publications

References 23 publications

Electron Transfer Dynamics in Dye‐Sensitized Solar Cells Utilizing Oligothienylvinylene Derivates as Organic Sensitizers

Electron Transfer Dynamics in Dye‐Sensitized Solar Cells Utilizing Oligothienylvinylene Derivates as Organic Sensitizers

Injection and Recombination in Dye-Sensitized Solar Cells with a Broadband Absorbance Metal-Free Sensitizer Based on Oligothienylvinylene

Porphyrins and BODIPY as Building Blocks for Efficient Donor Materials in Bulk Heterojunction Solar Cells

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