Infrared activity of photoexcitations in polythiophene

Schäffer, H.; Heeger, Alan J.

doi:10.1016/0038-1098(86)90678-2

Cited by 88 publications

(23 citation statements)

References 29 publications

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“…In addition, as shown in Figure c, an intense and broad peak was observed near a wavenumber of 3600 cm −1 in the FT‐IR spectrum of the P3HT:s‐VO x mixture film, which is related to the P3 transition . Furthermore, the infrared‐active vibration (IRAV) modes were also observed between 900 and 1,400 cm −1 , which is another important fingerprint of the doping of CPs . Therefore, we can confirm the doping ability of s‐VO x on P3HT via this optical evidence.…”

Section: Resultssupporting

confidence: 56%

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Efficient Charge Extraction in Thick Bulk Heterojunction Solar Cells through Infiltrated Diffusion Doping

Kim

et al. 2014

Advanced Energy Materials

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A new strategy for improving the charge extraction in thick bulk heterojunction (BHJ) polymer solar cells (PSCs) is reported. By the deposition of a solution‐processed vanadium oxide (s‐VOx) onto BHJ active layers, conductive charge‐transport channels are formed inside the active layer via a charge‐transfer doping reaction between the lone‐pair electrons of the sulfur atoms in the polymer and the Lewis‐acidic vanadium atoms of the s‐VOx. Because the charge‐transport channels significantly reduce charge recombination in the BHJ films, high internal quantum efficiencies (IQEs) of over 80% are achieved in the thick inverted PSCs (≈420 nm). This finding represents a new strategy for improving the efficiency and feasibility of printable photovoltaic devices.

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Section: Resultssupporting

confidence: 56%

“…[ 17 ] Furthermore, the infrared-active vibration (IRAV) modes were also observed between 900 and 1,400 cm −1 , which is another important fi ngerprint of the doping of CPs. [ 18,19 ] Therefore, we can confi rm the doping ability of s-VO x on P3HT via this optical evidence.…”

Section: Infi Ltrated Doped Regions In I-pscsmentioning

confidence: 80%

Efficient Charge Extraction in Thick Bulk Heterojunction Solar Cells through Infiltrated Diffusion Doping

Kim

et al. 2014

Advanced Energy Materials

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“…For PT, two groups of photoinduced infrared active vibrations ͑IRAV͒ spectrum have been observed. 4,5 In addition to the strong T modes at 1020, 1120, 1200, and 1323 cm Ϫ1 , photoinduced absorptions are observed at 690, 728, and 782 cm Ϫ1 with even weaker features at 900 and 1435 ͑possible a doublet͒ cm Ϫ1 . Six absorption peaks at 700, 1047, 1175, 1220, 1460, and 1500 cm Ϫ1 have been observed in Raman spectra.…”

Section: Introductionmentioning

confidence: 98%

Two-dimensional localized vibrational modes of polythiophene around a bipolaron

Xie

Kang

2000

Phys. Rev. B

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“…[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.…”

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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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Infrared activity of photoexcitations in polythiophene

Cited by 88 publications

References 29 publications

Efficient Charge Extraction in Thick Bulk Heterojunction Solar Cells through Infiltrated Diffusion Doping

Efficient Charge Extraction in Thick Bulk Heterojunction Solar Cells through Infiltrated Diffusion Doping

Two-dimensional localized vibrational modes of polythiophene around a bipolaron

Resonance Raman Spectroscopy of the T₁ Triplet Excited State of Oligothiophenes

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Infrared activity of photoexcitations in polythiophene

Cited by 88 publications

References 29 publications

Efficient Charge Extraction in Thick Bulk Heterojunction Solar Cells through Infiltrated Diffusion Doping

Efficient Charge Extraction in Thick Bulk Heterojunction Solar Cells through Infiltrated Diffusion Doping

Two-dimensional localized vibrational modes of polythiophene around a bipolaron

Resonance Raman Spectroscopy of the T1 Triplet Excited State of Oligothiophenes

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Resonance Raman Spectroscopy of the T₁ Triplet Excited State of Oligothiophenes