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You searched on: Author: Steven Robey

Displaying records 1 to 10 of 22 records.
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1. Beyond Fullerene Acceptors: Comparison of Exciton Dissociation at Pc/C60 and Pc/PTCDA Interfaces
Published: 5/22/2015
Authors: Steven W Robey, Gregory J. Dutton
Abstract: The development of organic photovoltaic technologies would benefit from the introduction of non-fullerene materials to replace the dominant fullerene acceptors. However, efforts to replace fullerenes with non-fullerene polymers or small molecules ha ...

2. C60 Chain Phases on ZnPc/Ag(111) Surfaces: Pattern Formation Driven by Competing Intermolecular Interactions
Published: 2/4/2015
Authors: Steven W Robey, W. Jin, D. B. Dougherty, W. G. Cullen, J. E. Reutt-Robey, J. Weeks, Q. Liu,
Abstract: Serpentine chain C60 phases were observed in scanning tunneling microscopy (STM) images of C60 layers on ZnPc or pentacene covered Ag(111) and Au(111) surfaces. This low density, quasi-one-dimensional organization contrasts starkly with the close-pa ...

3. Dipole-Dipole Interactions in TiOPc Adlayers on Ag
Published: 2/20/2014
Authors: Steven W Robey, Xianjie Liu, Yinying Wei, Janice E. Reutt-Robey
Abstract: 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 t ...

4. Distance-Dependent Ultrafast Dynamics at H2Pc\C60 Interfaces
Published: 12/5/2013
Authors: Gregory John Dutton, Steven W Robey
Abstract: 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 t ...

5. Sub-picosecond exciton dynamics at CuPc/C60 interfaces: Energy dependence of exciton dissociation
Published: 9/13/2012
Author: Steven W Robey
Abstract: Donor-acceptor interfaces are critical for the operation of organic photovoltaic devices. Exciton dynamics, leading to charge separation and recombination at these interfaces, play a significant role in determining efficiency, potentially controllin ...

6. Superatom Orbitals of C60 on Ag(111) : Two Photon Photoemission and Scanning Tunneling Spectroscopy
Published: 11/8/2011
Authors: Gregory John Dutton, Dan B. Dougherty, W. Jin, Janice E. Reutt-Robey, Steven W Robey
Abstract: Two photon photoemission (2PPE) and scanning tunneling spectroscopy (STS) were used to investigate C60 layers on Ag(111), focusing on unoccupied level assignments and, in particular, superatom molecular orbitals, SAMO‰s. SAMO‰s are diffuse levels tha ...

7. Potassium Induced Charge Transfer Effects in OPE-based Molecular Layers
Published: 8/11/2011
Authors: Steven W Robey, Gregory John Dutton
Abstract: 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 ...

8. Striped Domains at the Pentacene:C^d60^ Interface
Published: 1/12/2009
Authors: Dan B. Dougherty, W Jin, J Cullen, J Reutt-Robey, Steven W Robey
Abstract: 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 ...

9. Variable Temperature Scanning Tunneling Microscopy of Pentacene Monolayer and Bilayer Phases on Ag(111)
Published: 12/25/2008
Authors: Dan B. Dougherty, Jim Wei, William Cullen, Janice Reutt-Robey, Steven W Robey
Abstract: Pentacene deposited onto a Ag(111) surface at 300 K is studied using scanning tunneling microscopy at temperatures of 300 K and 50 K.  At 300 K, ordered pentacene structures nucleate at Ag step edges (<i>Phys. Rev. B</i>  <b>2005 ...

10. Ultraviolet Photoemission Spectra of Para-Phenylene-Ethynylene Thiols Chemisorbed on Gold
Published: 1/1/2008
Authors: Christopher D Zangmeister, Roger D van Zee, Steven W Robey, N E Gruhn, Yuxing Yao, J M Tour
Abstract: 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 w ...

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