Surface Electronic Structures of Polythiophene Derivatives

Hao, Xiaotao; Hosokai, Takuya; Mitsuo, N.; Kera, Satoshi; Sakamoto, Kazuyuki; Okudaira, Koji K.; Ueno, Nobuo

doi:10.1002/masy.200750425

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…All spectra are referenced to the Fermi level of gold and a spectrum of the phosphonic acid modified ITO is included for comparison. Nearest the Fermi edge, we see the two distinct photoemission features commonly observed in polythiophenes. − Both features are thought to arise from ionization of π electrons in the conjugated polymer backbone. The lowest IP feature originates mostly from the C 2pz orbitals along the polymer backbone, with some contribution from the hybridized S 3p atomic orbitals. − The second ionization feature (IP′) results from π electrons in more localized environments such as electrons in polymer chains comprised of only a few monomer units or near chain defects.…”

Section: Resultsmentioning

confidence: 87%

“…Nearest the Fermi edge, we see the two distinct photoemission features commonly observed in polythiophenes. − Both features are thought to arise from ionization of π electrons in the conjugated polymer backbone. The lowest IP feature originates mostly from the C 2pz orbitals along the polymer backbone, with some contribution from the hybridized S 3p atomic orbitals. − The second ionization feature (IP′) results from π electrons in more localized environments such as electrons in polymer chains comprised of only a few monomer units or near chain defects. This feature exhibits a marked decrease in electronic density as the polymer is oxidized, indicating the loss of these more localized states during electrochemical oxidation.…”

Section: Resultsmentioning

confidence: 87%

“…As the polymer film was progressively oxidized, angle resolved (surface sensitive) XPS C 1s spectra (Figure ), showed increased intensity of features on the high binding energy side of the main C 1s peak. This observed peak broadening, which is more apparent in the thick P3MT spectra, reflects the presence of polaronic and bipolaronic P3MT species seen in the high binding energy edge of the C 1s spectra as a result of oxidative doping. − …”

Section: Resultsmentioning

confidence: 94%

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Surface-Initiated Synthesis of Poly(3-methylthiophene) from Indium Tin Oxide and its Electrochemical Properties

et al. 2012

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Poly(3-methylthiophene) (P3MT) was synthesized directly from indium tin oxide (ITO) electrodes modified with a phosphonic acid initiator, using Kumada catalyst transfer polymerization (KCTP). This work represents the first time that polymer thickness has been controlled in a surface initiated KCTP reaction, highlighting the utility of KCTP in achieving controlled polymerizations. Polymer film thicknesses were regulated by the variation of the solution monomer concentration and ranged from 30 to 265 nm. Electrochemical oxidative doping of these films was used to manipulate their near surface composition and effective work function. Doped states of the P3MT film are maintained even after the sample is removed from solution and potential control confirming the robustness of the films. Such materials with controllable thicknesses and electronic properties have the potential to be useful as interlayer materials for organic electronic applications.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 94%

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Surface-Initiated Synthesis of Poly(3-methylthiophene) from Indium Tin Oxide and its Electrochemical Properties

et al. 2012

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Infrared and photoelectron spectroscopy study of vapor phase deposited poly (3-hexylthiophene)

Wei¹,

Scudiero²,

Eilers³

2009

Applied Surface Science

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Poly (3-hexylthiophene) (P3HT) was thermally evaporated and deposited in vacuum. Infrared spectroscopy was used to confirm that the thin films were indeed P3HT, and showed that in-situ thermal evaporation provides a viable route for contaminant-free surface/interface analysis of P3HT in an ultrahigh vacuum (UHV) environment. Ultraviolet photoelectron spectroscopy (UPS) as well as X-ray photoelectron spectroscopy (XPS) experiments were carried out to examine the frontier orbitals and core energy levels of P3HT thin films vapor deposited in UHV on clean polycrystalline silver (Ag) surfaces. UPS spectra enable the determination of the vacuum shift at the polymer/metal interface, the valence band maximum (VBM), and the energy of the -band of the overlayer film. The P3HT vacuum level decreased in contrast to that of the underlying Ag as the film thickness increased. XPS and UPS data confirmed the chemical integrity (stoichiometry) of the polymer at high coverage, as well as the shift of the C 1s and S 2p binding energy peaks and the secondary-electron edge with increasing film thickness, indicating that band bending is present at the P3HT/Ag interface and that the measured onset of the valence band is about 0.8  0.05 eV relative to the Fermi level.

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Surface Electronic Structures of Polythiophene Derivatives

Cited by 2 publications

References 9 publications

Surface-Initiated Synthesis of Poly(3-methylthiophene) from Indium Tin Oxide and its Electrochemical Properties

Surface-Initiated Synthesis of Poly(3-methylthiophene) from Indium Tin Oxide and its Electrochemical Properties

Infrared and photoelectron spectroscopy study of vapor phase deposited poly (3-hexylthiophene)

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