Abstract
A general technique for modifying energy level alignment at organic-organic heterojunctions is introduced, and is demonstrated here for phenyl-C 61-butyric acid methyl ester (PCBM) and N,N′-Di-[(1-naphthyl)- N,N′-diphenyl]-1,1′-biphenyl)-4,4′-diamine (α-NPD). An ultra-thin layer (∼1 nm) of TiO2 is used as an adhesion template to attach a self-assembled monolayer of dipolar phosphonate (PA) molecules to the lower interface of a two-stack ensemble. This modification induces shifts in the vacuum level and work function over ∼1.0 eV depending on the molecular dipole moment of the PA, which in turn modifies the electronic level alignment across the organic heterojunction interface by up to 0.5 eV.
Original language | English (US) |
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Pages (from-to) | 2360-2366 |
Number of pages | 7 |
Journal | Organic Electronics |
Volume | 15 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2014 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Biomaterials
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry
- Electrical and Electronic Engineering
Keywords
- Interface modification
- Organic-organic interface
- PCBM
- Self-assembled monolayer
- α-NPD