Index Catalog // ScholarsArchive@OSU

Creator:: McCulley, Daniel R.
Abstract:: In nanoscale materials, the Coulombic interaction between electrons are stronger than in bulk materials. These stronger interactions, caused by confinement and reduced dielectric screening, have interesting consequences for light-matter interactions. In carbon nanotubes (CNTs), strong interactions can enhance the impact ionization process, and thus assist photocurrent generation in CNTs. Conversely,...
Resource Type:: Dissertation
Full Text:: ABSTRACT OF THE DISSERTATION OF Daniel McCulley for the degree of Doctor of Philosophy in Physics

Creator:: McCulley, Daniel R., Senger, Mitchell J., Bertoni, Andrea, and Perebeinos., Vasili
Abstract:: Carbon nanotube (CNT) photodiodes have potential to convert light into electrical current with high efficiency. However, previous experiments have revealed photocurrent quantum yield (PCQY) well below 100%. In this work, we show that axial electric field increases the PCQY of CNT photodiodes. In optimal conditions our data suggest PCQY >...
Resource Type:: Article
Full Text:: carbon nanotube photodiodes enabled by a strong axial electric field Daniel R. McCulley1, Mitchell

Creator:: Aspitarte, Lee, McCulley, Daniel R., and Minot, Ethan D.
Abstract:: PN junctions in nanoscale materials are of interest for a range of technologies including photodetectors, solar cells, and light-emitting diodes. However, Schottky barriers at the interface between metal contacts and the nanomaterial are often unavoidable. The effect of metal-semiconductor interfaces on the behavior of nanoscale diodes must be understood, both...
Resource Type:: Article
Full Text:: Series with Tunable Schottky Barriers Lee Aspitarte, Daniel R. McCulley, Ethan D. Minot

Creator:: Aspitarte, Lee, McCulley, Daniel R., and Minot, Ethan D.
Abstract:: We study photocurrent generation in individual suspended carbon nanotube pn junctions using spectrally-resolved scanning photocurrent microscopy. Spatial maps of the photocurrent allow us to determine the length of the pn junction intrinsic region, as well as the role of the n-type Schottky barrier. We show that reverse-bias operation eliminates complications...
Resource Type:: Article
Full Text:: yield in suspended carbon nanotube pn junctions Lee Aspitarte, Daniel R. McCulley, Ethan D. Minot

Creator:: Senger, Mitchell J., McCulley, Daniel R., Lotfizadeh, Neda, Deshpande, Vikram V., and Minot, Ethan D.
Abstract:: Suspended metallic carbon nanotubes (m-CNTs) exhibit a remarkably large transport gap that can exceed 100 meV. Both experiment and theory suggest that strong electron-electron interactions play a crucial role in generating this electronic structure. To further understand this strongly-interacting system, we have performed electronic measurements of suspended m-CNTs with known...
Resource Type:: Preprint and Article
Full Text:: nanotubes Mitchell J. Senger1, Daniel R. McCulley1, Neda Lotfizadeh2, Vikram V. Deshpande2, Ethan D

Creator:: Purushothaman, Balaji, Parkin, Sean R., Kendrick, Mark J., David, Daniel, Ward, Jeremy W., Yu, Liyang, Stingelin, Natalie, Jurchescu, Oana D., Ostroverkhova, Oksana, and Anthony, John E.
Abstract:: Acenes larger than pentacene are predicted to possess enticing electronic properties, but are insoluble and prone to rapid decomposition. Utilizing a combination of functionalization strategies, we present stable, solution processable hexacenes and an evaluation of their hole and electron transport properties.
Resource Type:: Article
Full Text:: charge transport studies of stable, soluble hexacenes Balaji Purushothaman, a,b Sean R. Parkin, a

ScholarsArchive@OSU