Enhancement of electron injection into a light-emitting polymer from an aluminum oxide cathode modified by a self-assembled monolayer

Yana Vaynzof; T. Joseph Dennes; Jeffrey Schwartz; Antoine Kahn

doi:10.1063/1.2980425

Enhancement of electron injection into a light-emitting polymer from an aluminum oxide cathode modified by a self-assembled monolayer

Yana Vaynzof, T. Joseph Dennes, Jeffrey Schwartz, Antoine Kahn

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Abstract

A self-assembled monolayer (SAM) of octylphosphonate was deposited on an Al Ox electrode using the tethering by aggregation and growth (T-BAG) procedure. Ultraviolet photoemission spectroscopy (UPS) measurements showed a decrease in the substrate work function from 3.8 to 3.3 eV. Poly [9, 9′ -dioctylfluorene-co-bis- N, N′ -(4-butylphenyl)-diphenylamine] (TFB) films spin coated on the bare and the SAM-modified oxide surfaces were investigated by UPS. A shift in molecular levels, corresponding to a reduction in the electron injection barrier, was observed for the SAM-modified electrode. This barrier lowering was confirmed by current-voltage measurements showing a corresponding increase in electron current through the TFB/SAM/ Al Ox device.

Original language	English (US)
Article number	103305
Journal	Applied Physics Letters
Volume	93
Issue number	10
DOIs	https://doi.org/10.1063/1.2980425
State	Published - 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2980425

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title = "Enhancement of electron injection into a light-emitting polymer from an aluminum oxide cathode modified by a self-assembled monolayer",

abstract = "A self-assembled monolayer (SAM) of octylphosphonate was deposited on an Al Ox electrode using the tethering by aggregation and growth (T-BAG) procedure. Ultraviolet photoemission spectroscopy (UPS) measurements showed a decrease in the substrate work function from 3.8 to 3.3 eV. Poly [9, 9′ -dioctylfluorene-co-bis- N, N′ -(4-butylphenyl)-diphenylamine] (TFB) films spin coated on the bare and the SAM-modified oxide surfaces were investigated by UPS. A shift in molecular levels, corresponding to a reduction in the electron injection barrier, was observed for the SAM-modified electrode. This barrier lowering was confirmed by current-voltage measurements showing a corresponding increase in electron current through the TFB/SAM/ Al Ox device.",

author = "Yana Vaynzof and Dennes, {T. Joseph} and Jeffrey Schwartz and Antoine Kahn",

note = "Funding Information: This work was supported by the U.S. Department of Energy (Grant No. DE-FG02-04ER46165). J.S. also acknowledges support from the NSF (Grant No. CHE-0612572).",

year = "2008",

doi = "10.1063/1.2980425",

language = "English (US)",

volume = "93",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "10",

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TY - JOUR

T1 - Enhancement of electron injection into a light-emitting polymer from an aluminum oxide cathode modified by a self-assembled monolayer

AU - Vaynzof, Yana

AU - Dennes, T. Joseph

AU - Schwartz, Jeffrey

AU - Kahn, Antoine

N1 - Funding Information: This work was supported by the U.S. Department of Energy (Grant No. DE-FG02-04ER46165). J.S. also acknowledges support from the NSF (Grant No. CHE-0612572).

PY - 2008

Y1 - 2008

N2 - A self-assembled monolayer (SAM) of octylphosphonate was deposited on an Al Ox electrode using the tethering by aggregation and growth (T-BAG) procedure. Ultraviolet photoemission spectroscopy (UPS) measurements showed a decrease in the substrate work function from 3.8 to 3.3 eV. Poly [9, 9′ -dioctylfluorene-co-bis- N, N′ -(4-butylphenyl)-diphenylamine] (TFB) films spin coated on the bare and the SAM-modified oxide surfaces were investigated by UPS. A shift in molecular levels, corresponding to a reduction in the electron injection barrier, was observed for the SAM-modified electrode. This barrier lowering was confirmed by current-voltage measurements showing a corresponding increase in electron current through the TFB/SAM/ Al Ox device.

AB - A self-assembled monolayer (SAM) of octylphosphonate was deposited on an Al Ox electrode using the tethering by aggregation and growth (T-BAG) procedure. Ultraviolet photoemission spectroscopy (UPS) measurements showed a decrease in the substrate work function from 3.8 to 3.3 eV. Poly [9, 9′ -dioctylfluorene-co-bis- N, N′ -(4-butylphenyl)-diphenylamine] (TFB) films spin coated on the bare and the SAM-modified oxide surfaces were investigated by UPS. A shift in molecular levels, corresponding to a reduction in the electron injection barrier, was observed for the SAM-modified electrode. This barrier lowering was confirmed by current-voltage measurements showing a corresponding increase in electron current through the TFB/SAM/ Al Ox device.

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DO - 10.1063/1.2980425

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JO - Applied Physics Letters

JF - Applied Physics Letters

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M1 - 103305

ER -

Enhancement of electron injection into a light-emitting polymer from an aluminum oxide cathode modified by a self-assembled monolayer

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