Controlling Schottky energy barriers in organic electronic devices using self-assembled monolayers

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.R14321· OSTI ID:401141

Campbell, I H; Rubin, S; Zawodzinski, T A; Kress, J D; Martin, R L; Smith, D L ^[1]; Barashkov, N N; Ferraris, J P ^[2]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. The University of Texas at Dallas, Richardson, Texas 75083 (United States)

We demonstrate tuning of Schottky energy barriers in organic electronic devices by utilizing chemically tailored electrodes. The Schottky energy barrier of Ag on poly[2-methoxy], 5-(2{prime}-ethyl-hexyloxy)- 1,4-phenylene was tuned over a range of more than 1 eV by using self-assembled monolayers (SAM{close_quote}s) to attach oriented dipole layers to the Ag prior to device fabrication. Kelvin probe measurements were used to determine the effect of the SAM{close_quote}s on the Ag surface potential. {ital Ab} {ital initio} Hartree-Fock calculations of the molecular dipole moments successfully describe the surface potential changes. The chemically tailored electrodes were then incorporated in organic diode structures and changes in the metal/organic Schottky energy barriers were measured using an electroabsorption technique. These results demonstrate the use of self-assembled monolayers to control metal/organic interfacial electronic properties. They establish a physical principle for manipulating the relative energy levels between two materials and demonstrate an approach to improve metal/organic contacts in organic electronic devices. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 401141
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 20 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
66 PHYSICS
ADSORBATES
ELECTRIC DIPOLE MOMENTS
ELECTRONIC EQUIPMENT
ELECTRONIC STRUCTURE
ENERGY LEVELS
INTERFACES
MOLECULAR ORIENTATION
MONOLAYERS
ORGANIC POLYMERS
SCHOTTKY BARRIER DIODES
SILVER
SURFACE POTENTIAL