Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3453759
Keywords
conduction bands; electric moments; II-VI semiconductors; organic light emitting diodes; organic-inorganic hybrid materials; self-assembly; wide band gap semiconductors; zinc compounds
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Funding
- Mid-career Researcher Program [20090085470]
- National Research Laboratory [R0A-2008-000-20057-0]
- World Class University (WCU) [R32-2008-000-10051-0]
- Center for Inorganic Photovoltaic Materials (ERC) [2008-0062204]
- Research Foundation of Korea [NRF-2009-C1AAA001-2009-0093020]
- UNIST (Ulsan National Institute of Science and Technology)
- Engineering and Physical Sciences Research Council [GR/S99075/01, GR/S99075/02] Funding Source: researchfish
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We investigate the effect of self-assembled dipole molecules (SADMs) on ZnO surface in hybrid organic-inorganic polymeric light-emitting diodes (HyPLEDs). Despite the SADM being extremely thin, the magnitude and orientation of SADM dipole moment effectively influenced the work function of the ZnO. As a consequence, the charge injection barrier between the conduction band of the ZnO and the lowest unoccupied molecular orbital of poly(9,9(')-dioctylfluorene)-co-benzothiadiazole could be efficiently controlled resulting that electron injection efficiency is remarkably enhanced. The HyPLEDs modified with a negative dipolar SADM exhibited enhanced device performances, which correspond to approximately a fourfold compared to those of unmodified HyPLEDs. (C) 2010 American Institute of Physics. [doi:10.1063/1.3453759]
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