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Energy

Alternative energy

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Displaying 451 - 475 of 706

In-situ morphology studies of the mechanism for solution additive effects on the formation of bulk heterojunction films.

September 29, 2014
Author(s)
Lee J. Richter, Dean M. DeLongchamp, Kang W. Chou, Aram Amassian, A Hexemer, Eric Schaible, Felicia A. Bokel, Sebastian Engmann
The most successful active film morphology in organic photovoltaics is the bulk heterojunction (BHJ). The performance of a BHJ arises from a complex interplay of the spatial organization of the segregated donor and acceptor phases and the local order

Compressed-liquid density measurements of three alternative turbine fuels

August 10, 2014
Author(s)
Stephanie L. Outcalt
Heavier kerosene based liquid fuels for aircraft and rockets are required to meet stringent performance specifications. Nevertheless, the escalating cost, unpredictable supply, and environmental impacts of traditional petroleum based fuels used for that

Comparing Matched Polymer:Fullerene Solar Cells Made by Solution-Sequential Processing and Traditional Blend Casting: Nanoscale Structure and Device Performance

July 8, 2014
Author(s)
Andrew Herzing, Steven A. Hawks, Jordan C. Aguirre, Laura T. Schelhas, Robert Thompson, Rachel Huber, Amy Ferreira, Guangye Zhang, Robert A. Street, Sarah Tolbert, Benjamin Schwartz
Efficient bulk heterojunction (BHJ) solar cells based on polymer:fullerene photoactive layers can be created either by traditional blend casting (BC), where the components are mixed together in solution before being cast, or by solution-sequential

Cathodoluminescence Quantum Efficiency of Quantum Dot Thin Films

July 7, 2014
Author(s)
Heayoung Yoon, Christopher C. Bohn, Youngmin Lee, Seung H. Ko, Jonathan S. Steckel, Seth Coe-Sullivan, Nikolai B. Zhitenev
A thin film of quantum dots (QD) was used to visualize the local photo-response of polycrystalline CdTe solar cells by down-converting an electron beam of high energy to photons of visible light. The efficient photon generation in the QD film is compared

Predicting the J-V Curve in Organic Photovoltaics Using Impedance Spectroscopy

June 2, 2014
Author(s)
James I. Basham, Thomas N. Jackson, David J. Gundlach
We employ impedance spectroscopy as a method to predict the current-voltage curve in organic photovoltaics. This technique allows the quantification of the recombination rate, series resistance, carrier density and lifetime very close to normal operating

Evolution of electrochemical interfaces in solid oxide fuel cells (SOFC): a Ni and Zr resonant anomalous ultra-small-angle X-ray scattering studywith elemental and spatial resolution across the cell assembly

June 1, 2014
Author(s)
Andrew J. Allen, Jan Ilavsky, Pete R. Jemian, Artur Braun
Electrochemical interfaces are key to the direct conversion of fuels to electrical energy and lend energy converters like solid oxide fuel cells (SOFC) their functionality. Over extended operation at high temperatures, the microstructure of the underlying

Predicting enzyme adsoprtion to lignin films from enzyme surface hydrophobicity

May 29, 2014
Author(s)
Deanne W. Sammond, John M. Yarbrough, Elisabeth Mansfield, Yannick J. Bomble, Sarah Hobdey, Stephen R. Decker, Larry Taylor, Michael G. Resch, Michael E. Himmel, Todd B. Vinzant, Michael F. Crowley
The loss of digestive activity of cellulase cocktails on biomass is a major challenge, commonly attributed to the binding of certain enzymes to lignin. While the binding mechanism remains unclear, hydrophobic interactions between enzymes and lignin are

Comparison of thin epitaxial film silicon photovoltaics fabricated on monocrystalline and polycrystalline seed layers on glass

May 5, 2014
Author(s)
C W. Teplin, Sachit Grover, Adrian Chitu, Alexander Limanov, Monical Chalal, James Im, Daniel Amkreutz, Stefan Gall, Heayoung Yoon, Vincenzo Lasalvia, H M. Branz, Paul Stradins, Kim M. Jones, Andrew G. Norman, David L. Young, Benjamin Lee
We fabricate thin epitaxial c-Si solar cells on display glass and fused silica substrates overcoated with a Si seed layer. We achieve an open circuit voltage (VOC) of 586 mV and 6.5% efficiency using a 2 µm thick absorber on a (100) monocrystalline layer
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