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Displaying 201 - 225 of 379

A Programmable Solar Simulator for Realistic Seasonal, Diurnal, and Air-Mass Testing of Multi-Junction Concentrator Photovoltaics

June 4, 2016
Author(s)
Tasshi Dennis, chanud yasanayake, Tim Gerke, Alex Payne, Lars Eng, brent fisher, Matt Meitl
We built a spectrally programmable super-continuum solar simulator and applied it to the realistic laboratory testing of a multi-junction concentrator solar cell. The novel simulator generated a broad range of illumination conditions representing changes

Saturation in Solar Cells from Ultra-Fast Pulsed-Laser Illumination

June 4, 2016
Author(s)
Tasshi Dennis
We investigate the potential saturation of a silicon solar cell in response to excitation from continuous-wave and ultra-fast pulsed lasers of equivalent average optical power. Because ultra-fast pulsed sources such as the super-continuum laser have very

Understanding and Control of Bipolar Doping in Copper Nitride

May 5, 2016
Author(s)
Angela N. Fioretti, Craig P. Schwartz, John Vinson, Dennis Nordlund, David Prendergast, Adele C. Tamboli, Filip Tuomisto, Stephan Lany, Eric S. Toberer, Andriy Zakutayev
Semiconductor materials that can be doped both n-type and p-type are desirable for diode-based applications and transistor technology. Copper nitride (Cu3N) is a metastable semiconductor with a solar-relevant bandgap that has been reported to exhibit

How to measure absolute P3HT crystallinity via 13C CPMAS NMR

April 20, 2016
Author(s)
Ryan C Nieuwendaal
We outline the details of acquiring quantitative 13C cross-polarization magic angle spinning (CPMAS) NMR spectra on the most ubiquitous polymer for organic electronics (OE) applications, poly(3-hexylthiophene) (P3HT), despite other groups’ claims that

NIST Weather Station for Photovoltaic and Building System Research

March 29, 2016
Author(s)
Matthew Boyd
A weather station has been constructed on the Gaithersburg, Maryland campus of the National Institute of Standards and Technology (NIST) as part of a research effort to assess performance of photovoltaic and building systems. This weather station includes

Predicting Structures of Ru-Centered Dyes: A Computational Screening Tool

March 16, 2016
Author(s)
Lisa A. Fredin, Thomas C. Allison
Dye-sensitized solar cells (DSCs) represent a viable means for harvesting solar energy to produce electrical power. Though a number of light harvesting dyes are in use, the search continues for more efficient and effective compounds to make commercially

Through-the-Glass Spectroscopic Ellipsometry for Analysis of CdTe Thin-Film Solar Cells in the Superstrate Configuration

February 25, 2016
Author(s)
Prakash Koirala, Jian Li, Heayoung Yoon, Puruswottam Aryal, Sylvain Marsillac, Angus R. Rockett, Nikolas Podraza, Robert W. Collins
Polycrystalline CdS/CdTe thin-film solar cells in the superstrate configuration have been studied by spectroscopic ellipsometry (SE) using glass side illumination. In this measurement method, the first reflection from the ambient/glass interface is

Interlaboratory study towards a climate-specific test: spectroscopic characterizations of EVA in glass/EVA/glass systems

February 23, 2016
Author(s)
Jae Hyun Kim, Christopher M. Stafford, Yadong Lyu, Li C. Yu, Chiao-Chi Lin, Tinh Nguyen, Xiaohong Gu
EVA as an encapsulant material is exposed to various UV irradiation, thermal cycles, and humidity conditions. Degradation of EVA can reduce not only power generation due to yellowing, but also a structural integrity of a PV module. In order to investigate

Pulsed KrF excimer laser dopant activation in nanocrystal silicon in a silicon dioxide matrix

February 22, 2016
Author(s)
Tian Zhang, Brian Simonds, Keita Nomoto, Binesh Puthen Veettil, Ziyun Lin, Ivan Perez Wurfl, Gavin Conibeer
We demonstrate that a pulsed KrF excimer laser (λ=248 nm, τ=22 ns) can be used as a post-furnace annealing method to greatly increase the electrically active doping concentration in nanocrystal silicon (ncSi) embedded in SiO2. The application of a single

The Impact of the Crystallite Orientation Distribution on Exciton Transport in Donor-Acceptor Conjugated Polymers

December 30, 2015
Author(s)
Alexander L. Ayzner, Jianguo Mei, Anthony Appleton, Dean DeLongchamp, Alexandre Nardes, Stephanie Benight, Nikos Kopidakis, Michael F. Toney, Zhenan Bao
Conjugated polymers are widely used materials in organic photovoltaic devices. Owing to their extended electronic wavefunctions, they often form semicrystalline thin films. Although it is known that the polymer crystal orientation plays a large role in

New perspective on glycoside hydrolase binding to lignin from pretreated corn stover

December 18, 2015
Author(s)
John M. Yarbrough, Ashutosh Mittal, Elisabeth Mansfield, Larry Taylor, Sarah Hobdey, Deanne W. Sammond, Yannick J. Bomble, Michael F. Crowley, Stephen R. Decker, Michael E. Himmel, Todd B. Vinzant
Non-specific binding of cellulases to lignin has been implicated as a major factor in the loss of cellulase activity during biomass conversion to sugars. It is believed that this binding may strongly impact process economics through loss of enzyme

Impact of Electricity Tariff Parameters on Net Zero Home Cost of Energy

September 29, 2015
Author(s)
Andrew P. Kuo, David Holmberg, Steven T. Bushby
Time-varying electricity rates impact the costs of operation and the value of renewable generation and storage resources. This study investigates the economic impact of electricity tariff parameters on the value of solar photovoltaic (PV) systems in the
Displaying 201 - 225 of 379
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