Raman spectral changes of PEDOT–PSS in polymer light-emitting diodes upon operation

Sakamoto, Satoshi; Okumura, Masanori; Zhao, Zinggang; Furukawa, Yukio

doi:10.1016/j.cplett.2005.07.040

Cited by 112 publications

(94 citation statements)

References 8 publications

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“…This issue could be alleviated by thinning the PEDOT-PSS layer or by electrochemically reducing the conducting polymer, the latter of which has been observed to lower the absorbance in the near-infrared. 34 Either approach, however, would likely affect the electrical conductivity of this layer. Hence, further research should focus on the development of highly conductive, minimally absorbing layers for use in the connection of the two semiconductor arrays, or methods to self-align and connect the wires of two different, suitably light absorbing semiconductor materials to obviate entirely the need for the electrically conductive layer in the membrane.…”

Section: E Optical Absorption Properties Of the Membranesmentioning

confidence: 99%

Electrical conductivity, ionic conductivity, optical absorption, and gas separation properties of ionically conductive polymer membranes embedded with Si microwire arrays

Spurgeon

Walter

Zhou

et al. 2011

Energy Environ. Sci.

109

131

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The optical absorption, ionic conductivity, electronic conductivity, and gas separation properties have been evaluated for flexible composite films of ionically conductive polymers that contain partially embedded arrays of ordered, crystalline, p-type Si microwires. The cation exchange ionomer Nafion, and a recently developed anion exchange ionomer, poly(arylene ether sulfone) that contains quaternary ammonium groups (QAPSF), produced composite microwire array/ionomer membrane films that were suitable for operation in acidic or alkaline media, respectively. The ionic conductivity of the Si wire array/ Nafion composite films in 2.0 M H 2 SO 4 (aq) was 71 mS cm À1, and the conductivity of the Si wire array/ QAPSF composite films in 2.0 M KOH(aq) was 6.4 mS cm À1. Both values were comparable to the conductivities observed for films of these ionomers that did not contain embedded Si wire arrays. Two Si wire array/Nafion membranes were electrically connected in series, using a conducting polymer, to produce a trilayer, multifunctional membrane that exhibited an ionic conductivity in 2.0 M H 2 SO 4 (aq) of 57 mS cm À1 and an ohmic electrical contact, with an areal resistance of $0.30 U cm 2 , between the two physically separate embedded Si wire arrays. All of the wire array/ionomer composite membranes showed low rates of hydrogen crossover. Optical measurements indicated very low absorption (<3%) in the ionexchange polymers but high light absorption (up to 80%) by the wire arrays even at normal incidence, attesting to the suitability of such multifunctional membranes for application in solar fuels production.

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Section: E Optical Absorption Properties Of the Membranesmentioning

confidence: 99%

Electrical conductivity, ionic conductivity, optical absorption, and gas separation properties of ionically conductive polymer membranes embedded with Si microwire arrays

Spurgeon

Walter

Zhou

et al. 2011

Energy Environ. Sci.

109

131

View full text Add to dashboard Cite

show abstract

“…PEDOT was one of the most used conducting polymers in the past few decades due to its high conductivity, good thermal and environmental stability, and simple synthesis. [37][38][39][40] Compared to the classical carbon coating, the in situ PEDOT coating does not require high temperature, and can therefore avoid the possible reduction of fast electronic path in the electrode, which allows faster charge transport. [39][40][41][42] Moreover, PEDOT conformal coating could avoid the nanoparticle aggregation upon cycling, maintain the structural stability against volume variation, and prevent the side reactions between the in situ formed nano-Fe 0 species and electrolyte during cycling, 34 which would benefit the cycling stability.…”

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confidence: 99%

PEDOT Encapsulated FeOF Nanorod Cathodes for High Energy Lithium-Ion Batteries

et al. 2015

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Conversion-reaction cathodes can potentially double the energy density of current Li-ion batteries. However, the poor cycling stability, low energy efficiency, and low power density of conversion-reaction cathodes limit their applications for Li-ion batteries. Herein, we report a revolutionary advance in a conversion-reaction cathode by developing a core-shell FeOF@PEDOT nanorods, in which partial substitution of fluorine with oxygen in FeF3 substantially enhance the reaction kinetics and reduce the potential hysteresis, while conformal nanolayer PEDOT coating provides a roubst fast electronic connection and prevents the side reactions. The FeOF@PEDOT nanorods deliver a capacity of 560 mA h g(-1) at 10 mA g(-1) with an energy density of >1100 W h kg(-1), which is more than two times higher than the theoretical energy density of LiCoO2. The FeOF@PEDOT nanorods can maintain a capacity of ~430 mA h g(-1) at 50 mA g(-1) (840 W h kg(-1)) for over 150 cycles with capacity decay rate of only 0.04% per cycle, which is 2 orders of magnitude lower than the capacity decay rate ever reported among all conversion-reaction cathodes. Detailed characterizations were conducted to identify the structure and mechanism responsible for these significant improvements that could translate into a Li-ion cell with a 2× increase in energy density.

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“…4,5 Optical spectroscopy techniques are facile tools for characterizing polymer-based devices [6][7][8] and can be used to probe non-pristine interfaces that are likely to occur in a production environment. 9 In particular, Raman scattering, where the vibrational modes of a molecule are mapped out through the inelastic scattering of light, is capable of elucidating subtle structural and chemical differences in molecular systems and has been successfully utilized to probe important changes 10,11 and degradation effects [12][13][14] in organic thin films and device structures. An extension of Raman scattering is surface-enhanced Raman scattering (SERS) where the plasmonic modes of nanostructured metal are used to enhance the Raman process by several orders of magnitude 15 enabling sensitivities reaching the detection of single molecules.…”

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confidence: 99%

Probing the electrode-polymer interface in conjugated polymer devices with surface-enhanced Raman scattering

Borys

Lupton

2012

Applied Physics Letters

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The role of cesium carbonate on the electron injection and transport enhancement in organic layer by admittance spectroscopy Appl. Phys. Lett. 101, 193303 (2012) The role of cesium carbonate on the electron injection and transport enhancement in organic layer by admittance spectroscopy APL: Org. Electron. Photonics 5, 243 (2012) Growth and characterization of n-type electron-induced ferromagnetic semiconductor (In,Fe)As Appl. Phys. Lett. 101, 182403 (2012) Probing interfacial charge accumulation in ITO/α-NPD/Alq3/Al diodes under two electroluminescence operational modes by electric-field induced optical second-harmonic generation

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Raman spectral changes of PEDOT–PSS in polymer light-emitting diodes upon operation

Cited by 112 publications

References 8 publications

Electrical conductivity, ionic conductivity, optical absorption, and gas separation properties of ionically conductive polymer membranes embedded with Si microwire arrays

Electrical conductivity, ionic conductivity, optical absorption, and gas separation properties of ionically conductive polymer membranes embedded with Si microwire arrays

PEDOT Encapsulated FeOF Nanorod Cathodes for High Energy Lithium-Ion Batteries

Probing the electrode-polymer interface in conjugated polymer devices with surface-enhanced Raman scattering

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