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Search Publications by Steven W. Robey

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Displaying 1 - 24 of 24

Electronic Properties and Structure of Single Crystal Perylene

June 6, 2018
Sujitra J. Pookpanratana, Katelyn Goetz, Emily G. Bittle, Hamna Haneef, Lin You, Christina A. Hacker, Steven W. Robey, Oana Jurchescu, Ruslan Ovsyannikov, Erika Giangrisostomi
The transport properties of electronic devices made from single crystalline molecular semiconductors outperform those composed of thin-films. To further understand the superiority of these extrinsic properties, an understanding of the intrinsic electronic

Electronic Structure of Single Crystal a-Perylene

March 16, 2017
Sujitra J. Pookpanratana, Katelyn Goetz, Ruslan Ovsyannikov, Erika Giangrisostomi, Emily G. Bittle, Oana Jurchescu, Steven W. Robey, Christina A. Hacker
In organic electronics, the highest estimated charge mobility in a device is typically achieved when the organic semiconductor is a single crystal. However, the measurement of the electronic and chemical structure of organic single crystals by

Dipole-Dipole Interactions in TiOPc Adlayers on Ag

February 20, 2014
Steven W. Robey, Xianjie Liu, Yinying Wei, Janice E. Reutt-Robey
The molecular organization in layers of a polar phthalocyanine, titanyl phthalocyanine (TiOPc), on the Ag(110) surface was studied with scanning tunneling microscopy (STM). TiOPc molecules adsorb on Ag(110) in a tilted configuration in contrast to the flat

Distance-Dependent Ultrafast Dynamics at H2Pc\C60 Interfaces

December 5, 2013
Gregory J. Dutton, Steven W. Robey
We investigated the distance-dependence of interfacial charge transfer processes at the donor-acceptor heterojunction formed between H2Pc and C60. The interface region was formed layer-by-layer using organic molecular beam epitaxy (MBE). For each thickness

Potassium Induced Charge Transfer Effects in OPE-based Molecular Layers

August 11, 2011
Steven W. Robey, Gregory J. Dutton
The impact of potassium (K) addition on the electronic structure of oligo- (phenylene ethynylene) (OPE) and –NO2 substituted OPE (NO2-OPE) self-assembled monolayers was examined using ultraviolet photoemission. Addition below 0.5 K/molecule produced rigid

Striped Domains at the Pentacene:C 60 Interface

January 12, 2009
Dan B. Dougherty, W Jin, J Cullen, J Reutt-Robey, Steven W. Robey
STM observations of the initial growth stages of the first layer of pentacene on a monolayer film of C60 on Ag(111) are presented. Pentacene films nucleate and grow with molecules standing up at the Pentacene:C60 interface similar to the well known thin

Ultraviolet Photoemission Spectra of Para-Phenylene-Ethynylene Thiols Chemisorbed on Gold

January 1, 2008
Christopher D. Zangmeister, Roger D. van Zee, Steven W. Robey, N E. Gruhn, Yuxing Yao, J M. Tour
Photoemission spectra of para-phenylene-ethynylene thiols chemisorbed on gold have been measured. Four compounds were studied: 4,4'-bis(phenylethynyl)-benzenethiol, 4 (phenylethynyl)benzenethiol, 4-ethynylbenzenethiol, and benzenethiol. The spectra were

Fermi Level Alignment and Electronic Levels in Molecular Wire Self-Assembled Monolayers on Au

October 1, 2004
Christopher D. Zangmeister, Steven W. Robey, Roger D. van Zee, Yuxing Yao, J M. Tour
A combination of one- and two-photon photoelectron spectroscopies are used to determine the electronic structure around the Fermi level for self-assembled monolayers of a prototypical molecular wire , 4,4 -(ethynylphenyl)-1-benzenethiol (C6H5-C≡C-C6H4-C≡C-

Valence Electron Orbitals of an Oligo(p-phenylene-ethynylene)thiol on Gold

March 1, 2004
Christopher D. Zangmeister, Steven W. Robey, Roger D. van Zee, Yuxing Yao, J M. Tour
One- and two-photon photoemission spectra have been measured for monolayers of oligo(para-phenylene-ethynylene) thiolate chemisorbed on gold surfaces. Within 5 eV of the Fermi level, four states are observed, two occupied (2.0 eV and 4.0 eV below the Fermi

Initial Etching of GaAs (001) During H 2 Plasma Cleaning

September 1, 2000
Steven W. Robey, K Sinniah
The initial etching of GaAs(001) during remote H2 plasma etching for oxide removal was examined using Atomic Force Microscopy (AFM), coupled with in situ Reflection High Energy Diffraction (RHEED) and Auger spectroscopy. Localized etching of the GaAs

Mg/GaAs(001): A Highly Anisotropic Reaction Morphology

December 31, 1999
Steven W. Robey
The spontaneous growth of one-dimensional structures during reaction of Mg on GaAs(001) 4x2 Ga-stabilized surface was observed by in situ electron diffraction and ex situ atomic force microscopy (AFM). Reaction led to growth of an epitaxial, cubic phase

Anisotropic Microstructure Development During the Reaction of Mg With GaAs

February 18, 1998
Steven W. Robey
Reaction of Mg with GaAs (001) surface occurs at substrate temperatures above 250 K and leads to 3D growth of an epitaxial, cubic reaction phase with a lattice constant of 0.62 + 0.02nm, 9% larger than GaAs. The resulting anistotropic, 3-demiensional (3D)

Photoelectron Spectroscopy Studies of Cr(001) Near-Surface and Surface Magnetism

February 1, 1986
L Klebanoff, Steven W. Robey, Guangyao Liu, D Shirley
Angle-resolved photoelectron spectroscopy (ARPES) studies of Cr(001) near-surface and surface electronic structure are reviewed. The near-surface energy band dispersions were investigated along the [010] direction parallel to the crystal surface. The

Coordination and Local Transport Gap in C 60 Chains on a Pentacene Template

Dan B. Dougherty, W Jin, J Cullen, Gregory Dutton, J Reutt-Robey, Steven W. Robey
The adsorption of C60 on a bilayer film of pentacene on Ag(111) is studied with scanning tunneling microscopy and spectroscopy. At low coverage, C60 molecules form extended linear structures due to the templating effect of the pentacene bilayer. The