Alignment of poly(3,4-ethylenedioxythiophene) polymer chains in photovoltaic cells by ultraviolet irradiation

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Abstract

The conducting polymer poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) is a promising candidate for developing flexible electronics. The conductivity of this polymer can be increased via simple ultraviolet (UV) irradiation. This process can lead to enhanced performance and stability of organic photovoltaic (OPV) cells. We used micro-Raman spectroscopy, Kelvin probe force microscopy (KPFM), and quantum chemical calculations to map the energy band diagram and the electronic properties of PEDOT:PSS films irradiated with UV at various times. These procedures can explain how the observed changes in the macroscopic electronic properties of OPV cells arose from local changes in the carrier transport at the organic/organic and metal/organic interfaces. Micro-Raman spectroscopy indicates the effect of UV irradiation on PEDOT chains, which suggests a conformation change of PEDOT chains in the thin film. When UV irradiates the PEDOT:PSS film, the quinoid structure becomes the dominant conformation structure in the treated film. This change originates from the interaction between the dipole moment within the conjugate PEDOT chains and the electric field of the UV. Combining experimental results and theoretical calculations, we propose a gradient energy band for UV-treated PEDOT:PSS film that can reduce the barrier of the organic/organic heterojunction and can induce an interface dipole field at the organic/metal interface that simultaneously results in easy carrier extraction from PEDOT:PSS to metal and the enhancement of carrier transport from the active material to PEDOT:PSS.

Original languageEnglish
Pages (from-to)22409-22417
Number of pages9
JournalJournal of Materials Chemistry
Volume22
Issue number42
DOIs
Publication statusPublished - 2012 Nov 14

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Photovoltaic cells
Polymers
Irradiation
Carrier transport
Electronic properties
Band structure
Raman spectroscopy
Conformations
Metals
Flexible electronics
Dipole moment
Conducting polymers
Heterojunctions
Microscopic examination
Electric fields
Thin films
poly(3,4-ethylene dioxythiophene)
poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

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title = "Alignment of poly(3,4-ethylenedioxythiophene) polymer chains in photovoltaic cells by ultraviolet irradiation",
abstract = "The conducting polymer poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) is a promising candidate for developing flexible electronics. The conductivity of this polymer can be increased via simple ultraviolet (UV) irradiation. This process can lead to enhanced performance and stability of organic photovoltaic (OPV) cells. We used micro-Raman spectroscopy, Kelvin probe force microscopy (KPFM), and quantum chemical calculations to map the energy band diagram and the electronic properties of PEDOT:PSS films irradiated with UV at various times. These procedures can explain how the observed changes in the macroscopic electronic properties of OPV cells arose from local changes in the carrier transport at the organic/organic and metal/organic interfaces. Micro-Raman spectroscopy indicates the effect of UV irradiation on PEDOT chains, which suggests a conformation change of PEDOT chains in the thin film. When UV irradiates the PEDOT:PSS film, the quinoid structure becomes the dominant conformation structure in the treated film. This change originates from the interaction between the dipole moment within the conjugate PEDOT chains and the electric field of the UV. Combining experimental results and theoretical calculations, we propose a gradient energy band for UV-treated PEDOT:PSS film that can reduce the barrier of the organic/organic heterojunction and can induce an interface dipole field at the organic/metal interface that simultaneously results in easy carrier extraction from PEDOT:PSS to metal and the enhancement of carrier transport from the active material to PEDOT:PSS.",
author = "Fu-Ching Tang and Jay Chang and Wu, {Fu Chiao} and Cheng, {Horng Long} and Hsu, {Steve Lien Chung} and Chen, {Jen Sue} and Chou, {Wei Yang}",
year = "2012",
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AU - Tang, Fu-Ching

AU - Chang, Jay

AU - Wu, Fu Chiao

AU - Cheng, Horng Long

AU - Hsu, Steve Lien Chung

AU - Chen, Jen Sue

AU - Chou, Wei Yang

PY - 2012/11/14

Y1 - 2012/11/14

N2 - The conducting polymer poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) is a promising candidate for developing flexible electronics. The conductivity of this polymer can be increased via simple ultraviolet (UV) irradiation. This process can lead to enhanced performance and stability of organic photovoltaic (OPV) cells. We used micro-Raman spectroscopy, Kelvin probe force microscopy (KPFM), and quantum chemical calculations to map the energy band diagram and the electronic properties of PEDOT:PSS films irradiated with UV at various times. These procedures can explain how the observed changes in the macroscopic electronic properties of OPV cells arose from local changes in the carrier transport at the organic/organic and metal/organic interfaces. Micro-Raman spectroscopy indicates the effect of UV irradiation on PEDOT chains, which suggests a conformation change of PEDOT chains in the thin film. When UV irradiates the PEDOT:PSS film, the quinoid structure becomes the dominant conformation structure in the treated film. This change originates from the interaction between the dipole moment within the conjugate PEDOT chains and the electric field of the UV. Combining experimental results and theoretical calculations, we propose a gradient energy band for UV-treated PEDOT:PSS film that can reduce the barrier of the organic/organic heterojunction and can induce an interface dipole field at the organic/metal interface that simultaneously results in easy carrier extraction from PEDOT:PSS to metal and the enhancement of carrier transport from the active material to PEDOT:PSS.

AB - The conducting polymer poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) is a promising candidate for developing flexible electronics. The conductivity of this polymer can be increased via simple ultraviolet (UV) irradiation. This process can lead to enhanced performance and stability of organic photovoltaic (OPV) cells. We used micro-Raman spectroscopy, Kelvin probe force microscopy (KPFM), and quantum chemical calculations to map the energy band diagram and the electronic properties of PEDOT:PSS films irradiated with UV at various times. These procedures can explain how the observed changes in the macroscopic electronic properties of OPV cells arose from local changes in the carrier transport at the organic/organic and metal/organic interfaces. Micro-Raman spectroscopy indicates the effect of UV irradiation on PEDOT chains, which suggests a conformation change of PEDOT chains in the thin film. When UV irradiates the PEDOT:PSS film, the quinoid structure becomes the dominant conformation structure in the treated film. This change originates from the interaction between the dipole moment within the conjugate PEDOT chains and the electric field of the UV. Combining experimental results and theoretical calculations, we propose a gradient energy band for UV-treated PEDOT:PSS film that can reduce the barrier of the organic/organic heterojunction and can induce an interface dipole field at the organic/metal interface that simultaneously results in easy carrier extraction from PEDOT:PSS to metal and the enhancement of carrier transport from the active material to PEDOT:PSS.

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