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Work function recovery of air exposed molybdenum oxide thin films
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Figures

Image of FIG. 1.

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FIG. 1.

Work function of evaporated MoO film, along with work function versus annealing temperature of exposed MoO film.

Image of FIG. 2.

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FIG. 2.

Measured oxygen to molybdenum ratio of evaporated, one hour air exposed and vacuum annealed MoO film.

Image of FIG. 3.

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FIG. 3.

The UPS data of CuPc on annealed MoOx film. The cut-off region is presented in Fig. 1(a) , and the HOMO region in Fig. 1(b) .

Image of FIG. 4.

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FIG. 4.

The effect of air exposure and vacuum annealing on the energy levels of evaporated MoO thin film, and the energy level alignment at the CuPc and annealed MoO interface.

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2012-08-29
2014-04-18

Abstract

We report substantial work function (WF) recovery of air exposed molybdenum oxide thin films with vacuum annealing. We observed a sharp reduction in the MoO WF (from 6.8 eV to 5.6 eV) as well as a very thin layer of oxygen rich adsorbate on the MoO film after an hour of air exposure. The WF of the exposed MoO film started to gradually recover with increasing annealing temperature in vacuum, and the saturation in the WF recovery was observed at 450 °C with WF ∼6.4 eV. We further studied the interface formation between the annealed MoO and copper phthalocyanine (CuPc). The highest occupied molecular orbital (HOMO) level of CuPc was observed to be almost pinned to the Fermi level, strongly suggesting the possibility of efficient hole injection with the vacuum annealed MoO film.

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Scitation: Work function recovery of air exposed molybdenum oxide thin films
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/9/10.1063/1.4748978
10.1063/1.4748978
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