TY - JOUR
T1 - Interface dipole engineering at buried organic-organic semiconductor heterojunctions
AU - Shu, Andrew L.
AU - McClain, William E.
AU - Schwartz, Jeffrey
AU - Kahn, Antoine
N1 - Funding Information:
Support of this work by the Princeton MRSEC of the National Science Foundation (DMR-0819860) and a Grant from the National Science Foundation (DMR-1005892) is gratefully acknowledged. Help with sample preparation from Sushobhan Avasthi and James Sturm is also greatly appreciated.
PY - 2014/10
Y1 - 2014/10
N2 - 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.
AB - 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.
KW - Interface modification
KW - Organic-organic interface
KW - PCBM
KW - Self-assembled monolayer
KW - α-NPD
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U2 - 10.1016/j.orgel.2014.06.039
DO - 10.1016/j.orgel.2014.06.039
M3 - Article
AN - SCOPUS:84905040477
SN - 1566-1199
VL - 15
SP - 2360
EP - 2366
JO - Organic Electronics: physics, materials, applications
JF - Organic Electronics: physics, materials, applications
IS - 10
ER -