Photoexcitations in Regio-regular and Regio-random Polythiophene Films

Jiang, Xuejun; Österbacka, Ronald; An, Chong; Vardeny, Z.V.

doi:10.1016/s0379-6779(02)01181-5

Cited by 24 publications

(21 citation statements)

References 0 publications

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“…The highly redshifted PL of the shishkebab fibers is indicative of their high crystallinity. [39] In addition, the fibers' PL spectrum also shows two sharp peaks, one at 515 nm and the other at 554 nm. The first corresponds to residual excitation light, whereas the second is shifted by approximately 1 365 cm À1 to the former peak.…”

Section: Oriented Character Of the Fibers And Impact On Optical Propementioning

confidence: 99%

Epitaxial Growth of Highly Oriented Fibers of Semiconducting Polymers with a Shish‐Kebab‐Like Superstructure

Brinkmann

Chandezon

Pansu

et al. 2009

Adv Funct Materials

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International audienceHighly oriented fibers of regioregular poly(3-alkylthiophene)s (P3ATs) showing a ldquoshish-kebabrdquo morphology are prepared by oriented epitaxial crystallization in a mixture of 1,3,5-trichlorobenzene (TCB) and pyridine. The superstructure of the P3AT fibers consists of an oriented thread-like core several hundreds of micrometers long, the ldquoshishrdquo, onto which lateral crystalline fibrils made of folded polymer chains, the ldquokebabsrdquo, are connected in a periodic way with a periodicity in the range 18-30†nm. The P3AT-chain axis is oriented parallel to the fiber axis whereas the pi-stacking direction is oriented perpendicular to it. The oriented character of the shish-kebab fibers results in polarized optical absorption and photoluminescence. The formation of oriented precursors by epitaxial orientation of polymer chains onto long needles of a molecular crystal†-†TCB in the present case†-†appears to be an original alternative to the crystallization usually performed under external flow conditions

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Section: Oriented Character Of the Fibers And Impact On Optical Propementioning

confidence: 99%

Epitaxial Growth of Highly Oriented Fibers of Semiconducting Polymers with a Shish‐Kebab‐Like Superstructure

Brinkmann

Chandezon

Pansu

et al. 2009

Adv Funct Materials

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show abstract

“…[45][46][47][48][49][50][51][52][53] Infrared and Raman spectra were reported previously for photoexcited thiophene molecules, but without definitive assignment to a triplet excited state. 51,[54][55][56][57][58][59] Only recently were broadened vibrational bands assigned to triplet excitons in polythiophene, using femtosecond stimulated Raman spectroscopy. 60,61 Given the lack of resolved vibrational data for the triplets, we have acquired and analyzed resonance Raman spectra of two alkyl-functionalized oligothiophenes in their lowest triplet (T 1 ) excited state.…”

mentioning

confidence: 99%

Resonance Raman Spectroscopy of the T₁ Triplet Excited State of Oligothiophenes

Wang

Angelella

Doyle

et al. 2015

J. Phys. Chem. Lett.

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The characterization of triplet excited states is essential for research on organic photovoltaics and singlet fission. We report resonance Raman spectra of two triplet oligothiophenes with n-alkyl substituents, a tetramer and hexamer. The spectra of the triplets are more complex than the ground state, and we find that density functional theory calculations are a useful starting point for characterizing the bands. The spectra of triplet tetrathiophene and hexathiophene differ significantly from one another. This observation is consistent with a T1 excitation that is delocalized over at least five rings in long oligomers. Bands in the 500-800 cm(-1) region are greatly diminished for an aggregated sample of hexathiophene, likely caused by fast electronic dephasing. These experiments highlight the potential of resonance Raman spectroscopy to unequivocally detect and characterize triplets in thiophene materials. The vibrational spectra can also serve as rigorous standards for evaluating computational methods for excited-state molecules.

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“…The pure P3HT sample exhibits an aggregated PL spectrum, whose lamellar structure permits efficient electronic coupling between parallel chains leading to a red-shift in the emission [13] and the suppression of the lowest (0-0) peak [14,15]. In contrast, the P3HT emission from the P3HT-NT sample shows a defined 0-0 emission peak and a blue shift relative to the bulk P3HT emission.…”

Section: Photoluminescencementioning

confidence: 99%

Ultrafast Charge Separation at a Single-walled Carbon Nanotube – Polymer Interface

et al. 2011

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We report the observation of an ultrafast (~ 430 fs) charge transfer process at the interface between a single-walled carbon nanotube (SWNT) wrapped by a semi-conducting polymer, poly(3-hexylthiophene) (P3HT), creating free polarons on both materials. The addition of excess P3HT as a surrounding network allows these free polarons to be long-lived at room temperature. Our results suggest that SWNT-P3HT blends incorporating only 1% fractions of SWNTs can achieve a charge separation efficiency comparable to a conventional 60:40 P3HT-fullerene blend, provided small-diameter tubes are embedded in an excess P3HT matrix.

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Photoexcitations in Regio-regular and Regio-random Polythiophene Films

Cited by 24 publications

References 0 publications

Epitaxial Growth of Highly Oriented Fibers of Semiconducting Polymers with a Shish‐Kebab‐Like Superstructure

Epitaxial Growth of Highly Oriented Fibers of Semiconducting Polymers with a Shish‐Kebab‐Like Superstructure

Resonance Raman Spectroscopy of the T₁ Triplet Excited State of Oligothiophenes

Ultrafast Charge Separation at a Single-walled Carbon Nanotube – Polymer Interface

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Photoexcitations in Regio-regular and Regio-random Polythiophene Films

Cited by 24 publications

References 0 publications

Epitaxial Growth of Highly Oriented Fibers of Semiconducting Polymers with a Shish‐Kebab‐Like Superstructure

Epitaxial Growth of Highly Oriented Fibers of Semiconducting Polymers with a Shish‐Kebab‐Like Superstructure

Resonance Raman Spectroscopy of the T1 Triplet Excited State of Oligothiophenes

Ultrafast Charge Separation at a Single-walled Carbon Nanotube – Polymer Interface

Contact Info

Product

Resources

About

Resonance Raman Spectroscopy of the T₁ Triplet Excited State of Oligothiophenes