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Search Publications by: Andrew Herzing (Fed)

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Displaying 26 - 50 of 81

A workshop report on “Electron Microscopy Frontiers: Challenges and Opportunities”

December 21, 2017
Author(s)
June W. Lau, John E. Bonevich, Andrew A. Herzing, Ann C. Chiaramonti Debay, Robert R. Keller
For two days beginning on March 8, 2017, a planning workshop entitled “Electron Microscopy Frontiers: Opportunities and Challenges” was hosted by the Material Measurement Laboratory (MML) of the National Institute of Standards and Technology (NIST). Grass

Structural and electrical analysis of epitaxial 2D/3D vertical heterojunctions of monolayer MoS2 on GaN

August 4, 2017
Author(s)
Albert Davydov, Terrance P. O'Regan, Andrew A. Herzing, Dimitry Ruzmetov, Robert A. Burke, Kehao Zhang, A. Glen Birdwell, DeCarlos Taylor, E Byrd, Joshua A. Robinson, Tony G. Ivanov, M R. Neupane, S D. Walck
Integrating two-dimensional (2D) and three-dimensional (3D) semiconductors to realize vertical heterojunctions with novel electronic and optoelectronic properties is gaining interest from the device community. In this study, we utilize an approach that

Morphological characterization of fullerene and fullerene-free organic photovoltaics by combined real and reciprocal space techniques

May 26, 2017
Author(s)
Donglin Zhao, Qinghe Wu, Luping Yu, Harald Ade, Dean DeLongchamp, Lee J. Richter, Subhrangsu Mukherjee, Andrew Herzing
Morphology can play a critical role in determining function in organic photovoltaic (OPV) systems. Recently molecular acceptors have showed promise to replace¬ fullerene derivatives as acceptor materials in bulk heterojunction solar cells and have achieved

Optical Asymmetry and Nonlinear Light Scattering from Gold Nanorods

May 16, 2017
Author(s)
Andrew Herzing
A systematic study is presented of the intensity-dependent nonlinear light scattering spectra of gold nanorods under resonant excitation of the longitudinal surface plasmon resonance (SPR). The spectra exhibit features due to coherent second and third

Reduced Bimolecular Recombination in Blade-Coated, High-Efficiency, Small-Molecule Solar Cells

March 22, 2017
Author(s)
Sebastian Engmann, Hyun W. Ro, Andrew A. Herzing, Dean M. DeLongchamp, Chad R. Snyder, Lee J. Richter, Adam J. Barito, David J. Gundlach
The full benefit of emerging solution deposited photovoltaic devices requires development of processes compatible with high speed manufacturing. Extensive studies of the lab-to-fab challenge have been performed on polymer donor based organic photovoltaics

In situ X-ray scattering studies of the influence of an additive on the formation of a low-bandgap bulk- heterojunction

February 21, 2017
Author(s)
Felicia A. Bokel, Lee J. Richter, Sebastian Engmann, Andrew Herzing, Brian A. Collins, Hyun W. Ro, Dean DeLongchamp
The evolution of the morphology of a high-efficiency, blade-coated, organic-photovoltaic (OPV) active layer containing the low band-gap polymer poly[(4,8-bis[5-(2-ethylhexyl)thiophene-2-yl]benzo[1,2-b:4,5-b']dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)

Structure and Order in Organic Semiconductors

January 17, 2017
Author(s)
Chad R. Snyder, Dean M. DeLongchamp, Ryan C. Nieuwendaal, Andrew A. Herzing
Several techniques for characterizing semiconducting polymer order on different length scales are presented, including (1) differential scanning calorimetry (DSC), (2) solid state nuclear magnetic resonance spectroscopy (NMR), (3) transmission electron

Origins and Demonstrations of Electrons with Orbital Angular Momentum

January 9, 2017
Author(s)
Benjamin McMorran, Amit Agrawal, Peter Ercius, Vincenzo Grillo, Andrew Herzing, Tyler R. Harvey, Martin Linck
The surprising message of the 1992 paper of Allen, Beijersbergen, Spreeuw, and Woerdman (ABSW) was that photons could exhibit orbital motion in free space, which subsequently launched advancements in optical manipulation, microscopy, quantum optics

Analytical Multimode Scanning and Transmission Electron Imaging and Tomography of Multiscale Structural Architectures of Sulfur Copolymer-Based Composite Cathodes for Next Generation High-Energy Density Li-S Batteries

December 17, 2016
Author(s)
Vladimir P. Oleshko, Andrew A. Herzing, Christopher L. Soles, Jared J. Griebel, Woo J. Chung, Adam G. Simmonds, Jeff Pyun
Poly(sulfur-random-(1,3-diisopropenylbenzene) copolymers synthesized via inverse vulcanization represent an emerging class of electrochemically active polymers recently used in cathodes for Li-S batteries, capable of realizing enhanced capacity retention

Characterization of Yttrium-Rich Precipitate Phases in a Titanium Alloy Weld

December 1, 2016
Author(s)
Andrew Herzing, Ratna P. Kolli, Sreeramamurthy Ankem
The yttrium-rich (Y-rich) precipitates that form in the fusion zone (FZ) of a Ti-5111 alloy weld were characterized by atom probe tomography and scanning transmission electron microscopy. Two distinct types of precipitates were identified: (1) a higher

Film morphology evolution during solvent vapor annealing of highly efficient small molecule donor/acceptor blends

September 15, 2016
Author(s)
Sebastian Engmann, Hyun W. Ro, Andrew Herzing, Chad R. Snyder, Lee J. Richter, Paul Geraghty, David Jones
Solution-processable small molecule photovoltaics based on the novel molecular donor, benzodithiophene terthiophene rhodamine (BTR), recently have shown maximum power conversion efficiencies above 8% for active layer thicknesses up to 400 nm, using post

Morphology-insensitive Performance Facilitates Transition from Spin-Coating to Roll-to-Roll Coating For High-Performance, Solution-Processed Solar Cells

August 2, 2016
Author(s)
Lee J. Richter, Jonathan Downing, Sebastian Engmann, Hyun W. Ro, Andrew A. Herzing, Dean M. DeLongchamp, Subhrangsu Mukherjee, Harald Ade, Maged Addelsamie, Aram Amassian, Yuhang Liu, He Yan
Solution processing via roll-to-roll (R2R) coating promises a low cost, low thermal-budget, sustainable revolution for the production of solar cells. Yet virtually all high performance solution processed research cells have been demonstrated by spin

Transient thermometry and high-resolution analysis of filamentary resistive switches

June 28, 2016
Author(s)
Jonghan Kwon, Chao-Yang Chen, Abhishek Sharma, Andrea Fantini, Malgorzata Jurczak, James A. Bain, Yoosuf Picard, Marek Skowronski, Andrew Herzing
We present data on the filament size and temperature distribution in Hf0.82Al0.18Ox-based Resistive Random Access Memory (RRAM) devices obtained by transient thermometry and high- resolution transmission electron microscopy (HRTEM). The thermometry shows

Structural study of epitaxial LiCoO2 films grown by PLD on single crystal SrTiO3 substrates

May 24, 2016
Author(s)
Leonid A. Bendersky, Zhipeng Li, S. Yasui, Saya Takeuchi, Adam A. Creuziger, S. Maruyama, Andrew A. Herzing, I Takeuchi
Epitaxial LiCoO2 (LCO) thin films of different orientations were
 fabricated by pulsed laser deposition (PLD) in order to model single-crystal
 behavior of intercalation cathodes during electrochemical reactions. This paper demonstrates that
(1) epitaxial

Vapor-Liquid-Solid Etch of Semiconductor Surface Channels by Running Gold Nanodroplets

November 24, 2015
Author(s)
Babak Nikoobakht, Andrew A. Herzing, Shinichiro Muramoto, Jerry Tersoff
We show that Au nanoparticles spontaneously move across the (001) surface of InP, InAs, and GaP when heated in the presence of water vapor. As they move, the particles etch crystallographically aligned grooves into the surface. We show that this process is