Soft X-ray spectroscopy of C60/copper phthalocyanine/MoO 3 interfaces: Role of reduced MoO3 on energetic band alignment and improved performance

S. W. Cho; L. F.J. Piper; A. DeMasi; A. R.H. Preston; K. E. Smith; K. V. Chauhan; R. A. Hatton; T. S. Jones

doi:10.1021/jp1071428

Soft X-ray spectroscopy of C₆₀/copper phthalocyanine/MoO ₃ interfaces: Role of reduced MoO₃ on energetic band alignment and improved performance

S. W. Cho, L. F.J. Piper, A. DeMasi, A. R.H. Preston, K. E. Smith, K. V. Chauhan, R. A. Hatton, T. S. Jones

Physics

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

The interfacial electronic structure of C₆₀/copper phthalocyanine (CuPc)/molybdenum trioxide (MoO₃) thin films grown in situ on indium tin oxide (ITO) substrates has been studied using synchrotron radiation-excited photoelectron spectroscopy in an attempt to understand the influence of oxide interlayers on the performance of small molecule organic photovoltaic devices. The MoO₃ layer on ITO is found to significantly increase the work function of the substrate and induces large interface dipoles and band bending at the CuPc/MoO₃ interface. The large band bending confirms the formation of an internal potential that assists hole extraction from the CuPc layer to the electrode. The electronic structure of the MoO ₃ layer on ITO was also examined using various soft X-ray spectroscopies to probe the conductive nature of the MoO₃ thin film.

Original language	English
Pages (from-to)	18252-18257
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	114
Issue number	42
DOIs	https://doi.org/10.1021/jp1071428
Publication status	Published - 2010 Oct 28

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp1071428

Cite this

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title = "Soft X-ray spectroscopy of C60/copper phthalocyanine/MoO 3 interfaces: Role of reduced MoO3 on energetic band alignment and improved performance",

abstract = "The interfacial electronic structure of C60/copper phthalocyanine (CuPc)/molybdenum trioxide (MoO3) thin films grown in situ on indium tin oxide (ITO) substrates has been studied using synchrotron radiation-excited photoelectron spectroscopy in an attempt to understand the influence of oxide interlayers on the performance of small molecule organic photovoltaic devices. The MoO3 layer on ITO is found to significantly increase the work function of the substrate and induces large interface dipoles and band bending at the CuPc/MoO3 interface. The large band bending confirms the formation of an internal potential that assists hole extraction from the CuPc layer to the electrode. The electronic structure of the MoO 3 layer on ITO was also examined using various soft X-ray spectroscopies to probe the conductive nature of the MoO3 thin film.",

author = "Cho, {S. W.} and Piper, {L. F.J.} and A. DeMasi and Preston, {A. R.H.} and Smith, {K. E.} and Chauhan, {K. V.} and Hatton, {R. A.} and Jones, {T. S.}",

year = "2010",

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doi = "10.1021/jp1071428",

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T2 - Role of reduced MoO3 on energetic band alignment and improved performance

AU - Cho, S. W.

AU - Piper, L. F.J.

AU - DeMasi, A.

AU - Preston, A. R.H.

AU - Smith, K. E.

AU - Chauhan, K. V.

AU - Hatton, R. A.

AU - Jones, T. S.

PY - 2010/10/28

Y1 - 2010/10/28

N2 - The interfacial electronic structure of C60/copper phthalocyanine (CuPc)/molybdenum trioxide (MoO3) thin films grown in situ on indium tin oxide (ITO) substrates has been studied using synchrotron radiation-excited photoelectron spectroscopy in an attempt to understand the influence of oxide interlayers on the performance of small molecule organic photovoltaic devices. The MoO3 layer on ITO is found to significantly increase the work function of the substrate and induces large interface dipoles and band bending at the CuPc/MoO3 interface. The large band bending confirms the formation of an internal potential that assists hole extraction from the CuPc layer to the electrode. The electronic structure of the MoO 3 layer on ITO was also examined using various soft X-ray spectroscopies to probe the conductive nature of the MoO3 thin film.

AB - The interfacial electronic structure of C60/copper phthalocyanine (CuPc)/molybdenum trioxide (MoO3) thin films grown in situ on indium tin oxide (ITO) substrates has been studied using synchrotron radiation-excited photoelectron spectroscopy in an attempt to understand the influence of oxide interlayers on the performance of small molecule organic photovoltaic devices. The MoO3 layer on ITO is found to significantly increase the work function of the substrate and induces large interface dipoles and band bending at the CuPc/MoO3 interface. The large band bending confirms the formation of an internal potential that assists hole extraction from the CuPc layer to the electrode. The electronic structure of the MoO 3 layer on ITO was also examined using various soft X-ray spectroscopies to probe the conductive nature of the MoO3 thin film.

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