Influences of evaporation temperature on electronic structures and electrical properties of molybdenum oxide in organic light emitting devices

The influence of evaporation temperatures on the electronic structures of molybdenum oxide ( MoO x ) films and the electrical properties of organic light emitting diodes were investigated. MoO x films evaporated at a high temperature and a high deposition rate are close to a stoichiometric phase, bu...

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Published inJournal of applied physics Vol. 107; no. 5; pp. 053703 - 053703-3
Main Authors Lin, Chang-Ting, Yeh, Cheng-Hung, Chen, Mei-Hsin, Hsu, Shu-Han, Wu, Chih-I, Pi, Tun-Wen
Format Journal Article
LanguageEnglish
Published American Institute of Physics 01.03.2010
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ISSN0021-8979
1089-7550
DOI10.1063/1.3309783

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Summary:The influence of evaporation temperatures on the electronic structures of molybdenum oxide ( MoO x ) films and the electrical properties of organic light emitting diodes were investigated. MoO x films evaporated at a high temperature and a high deposition rate are close to a stoichiometric phase, but become less effective when they are used as a hole injection layer. However, when MoO x is evaporated at a lower temperature and a slower rate, there are large amounts of defect-related states present in the forbidden gap, which make the films behave like a high work function conductor and an effective hole injection layer.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3309783