Electronic structure of molybdenum-oxide films and associated charge injection mechanisms in organic devices

Jens Meyer; Antoine L. Kahn

doi:10.1117/1.3555081

1 January 2011 Electronic structure of molybdenum-oxide films and associated charge injection mechanisms in organic devices

Jens Meyer, Antoine L. Kahn

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Journal of Photonics for Energy, Vol. 1, Issue 1, 011109 (January 2011). https://doi.org/10.1117/1.3555081

Abstract

We report on the electronic structure of freshly evaporated and air-exposed Molybdenum tri-oxide (MoO₃) and the energy-level alignment between this compound and a hole-transport material [e.g., N,N′-diphenyl-N,N′-bis (1-naphthyl)-1,1′-biphenyl-4,4′-diamine (α-NPD)]. Ultraviolet and inverse photoelectron spectroscopy show that freshly evaporated MoO3 exhibits deep-lying electronic states with an electron affinity (EA) of 6.7 eV and ionization energy (IE) of 9.7 eV. Air exposure reduces EA and IE by ∼1 eV, to 5.5 and 8.6 eV, respectively, but does not affect the hole-injection efficiency, which is confirmed by device studies. Thus, MoO₃ can be applied in low-vacuum environment, which is particularly important for low-cost manufacturing processes. Our findings of the energy-level alignment between MoO3 and α-NPD also leads to a revised interpretation of the charge-injection mechanism, whereby the hole-injection corresponds to an electron extraction from the organic highest-occupied molecular orbital (HOMO) level via the MoO₃ conduction band.

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Jens Meyer and Antoine L. Kahn "Electronic structure of molybdenum-oxide films and associated charge injection mechanisms in organic devices," Journal of Photonics for Energy 1(1), 011109 (1 January 2011). https://doi.org/10.1117/1.3555081

Published: 1 January 2011

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