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Author: Hyun Ro

Displaying records 1 to 10 of 27 records.
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1. Visualization of phase evolution in model organic photovoltaic structures via energy-filtered transmission electron microscopy
Published: 8/9/2013
Authors: Andrew A Herzing, Hyun W. Ro, Christopher L Soles, Dean M DeLongchamp
Abstract: The morphology of the active layer in an organic photovoltaic bulk-heterojunction device is controlled by the extent and nature of phase separation during processing. Herein, we have examined the effects of fullerene crystallinity in the most wi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913752

2. Capillary Wave Dynamics of Thin Polymer films over Submerged Nanostructures
Published: 11/16/2012
Authors: Christopher L Soles, Hyun W. Ro, K. J. Alvine, Oleg Shpyrko, Yenling Dai, Alec Sandy, Suresh Narayanan
Abstract: The surface dynamics of thin molten polystyrene films supported by nanoscale periodic silicon line-space gratings were investigated with X-ray photon correlation spectroscopy. Surface dynamics over these nanostructures exhibit high directional aniso ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910869

3. Anisotropic, Hierarchical Surface Patterns via Surface Wrinkling of Nanoimprinted Polymer Films
Published: 10/22/2012
Authors: Junghyun Lee, Hyun W. Ro, Rui Huang, Thomas Avery Germer, Paul Lemaillet, Christopher L Soles, Christopher M Stafford
Abstract: we demonstrated the wrinkling behavior of nanopatterned PS films, whose wrinkle wavelength and resultant morphology depend strongly on geometric parameters of surface patterns as well as the direction of the applied strain relative to the nanopattern ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912044

4. Polymer-Fullerene Mixing in Organic Solar Cells
Published: 8/2/2012
Authors: Hyun W. Ro, Bulent Akgun, Regis J Kline, Chad R Snyder, Sushil K. Satija, Christopher L Soles, Dean M DeLongchamp, Michael F. Toney, Alexander L Ayzner, Brendan T O'Connor, Matthew Hammond
Abstract: The mixing behavior of the hole and electron transporting materials in bulk heterojunction (BHJ) organic photovoltaic (OPV) blends plays a key role in determining the nanoscale morphology, which is believed to be a decisive factor in determining devi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910942

5. Measuring domain sizes and compositional heterogeneities in P3HT-PCBM bulk heterojunction thin films with 1H spin diffusion NMR spectroscopy
Published: 3/21/2012
Authors: Ryan C Nieuwendaal, Hyun W. Ro, David Germack, Regis J Kline, Calvin Chan, Amit Kumar Agrawal, David J Gundlach, David Lloyd VanderHart, Dean M DeLongchamp
Abstract: In this manuscript we show that 1H spin diffusion NMR is a valuable method for estimating the domain sizes in thin films of a polymer-fullerene blend for bulk heterojunction (BHJ) photovoltaics. Variations in common BHJ film processing parameters hav ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908099

6. Molecular Order in High-Efficiency Polymer/Fullerene Bulk Heterojunction Solar Cells
Published: 9/22/2011
Authors: Matthew R. Hammond, Regis J Kline, Andrew A Herzing, Lee J Richter, David Germack, Hyun W. Ro, Christopher L Soles, Daniel A Fischer, Tao Xu, Luping Yu, Michael F. Toney, Dean M DeLongchamp
Abstract: We report quantitative measurements of ordering, molecular orientation, and nanoscale morphology in the active layer of bulk heterojunction organic photovoltaic cells based on a thieno[3,4-b]thiophene-alt-benzodithiophene copolymer (PTB7), which has ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908836

7. Separation and Characterization of Double Wall Carbon Nanotube Sub-Populations
Published: 7/8/2010
Authors: JiYeon Huh, Angela R Hight Walker, Hyun W. Ro, Jan Obrzut, Jeffrey A Fagan
Abstract: We present the separation of surfactant encapsulated double wall carbon nanotubes (DWCNTs) synthesized by the high pressure carbon monoxide decomposition (HiPco) process by length and electronic characteristics using density gradient ultracentrifugat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903752

8. High performance airbrushed organic thin film transistors
Published: 3/30/2010
Authors: Calvin Chan, Lee J Richter, Brad Anthony Dinardo, Cherno Jaye, Brad Conrad, Hyun W. Ro, David Germack, Daniel A Fischer, Dean M DeLongchamp, David J Gundlach
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904576

9. Electrical and structural characterization of high performance airbrushed organic thin film transistors
Published: 3/18/2010
Authors: Calvin Chan, Lee J Richter, Cherno Jaye, Brad Conrad, Hyun W. Ro, David Germack, Daniel A Fischer, Dean M DeLongchamp, David J Gundlach
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905344

10. Capillary Instability in Nanoimprinted Polymer Films
Published: 5/21/2009
Authors: Kyle J. Alvine, Yifu Ding, Hyun W. Ro, Brian C. Okerberg, Alamgir Karim, Christopher L Soles, Jack F Douglas
Abstract: Capillary forces play an active role in defining the equilibrium structure of nanoscale structures. This effect can be especially pronounced in soft materials such as polymers near or above their glass transition temperatures where material flow is ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852751



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