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497 Matching Results
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Photoelectrochemical Water Systems for H2 Production
This Photoelectrochemical Water Systems for Hydrogen Production presentation by the National Renewable Energy Laboratory's John Turner was given at the DOE Hydrogen Program's 2007 Annual Merit Review.
Date:
May 17, 2007
Creator:
Turner, J. A.; Deutsch, T.; Head, J. & Vallett, P.
System:
The UNT Digital Library
Quantifying Consumer Sensitivity to Hydrogen Refueling Station Coverage
This presentation by Cory Welch at the 2007 DOE Hydrogen Program Annual Merit Review Meeting focuses on consumer sensitivity to hydrogen refueling station coverage.
Date:
May 17, 2007
Creator:
Welch, C.
System:
The UNT Digital Library
Technology Validation: Fuel Cell Bus Evaluations
This presentation by Leslie Eudy at the 2007 DOE Hydrogen Program Annual Merit Review Meeting provides information about NREL's fuel cell bus evaluations.
Date:
May 18, 2007
Creator:
Eudy, L.
System:
The UNT Digital Library
Biomass and Biofuels: Technology and Economic Overview
Presentation on biomass and biofuels technology and economics presented at Pacific Northwest National Laboratory, May 23, 2007.
Date:
May 23, 2007
Creator:
Aden, Andy
System:
The UNT Digital Library
Deployment Issues for Biodiesel: Fuel Quality and Emission Impacts
None
Date:
May 24, 2007
Creator:
McCormick, R. L.
System:
The UNT Digital Library
Building Search Systems for Digital Library Collections
This presentation describes the infrastructure and collection in the University of North Texas (UNT) Libraries Digital initiatives. This discusses issues related to searching and explains possible solutions to best enhance metadata and searching capabilities.
Date:
May 31, 2007
Creator:
Phillips, Mark Edward
System:
The UNT Digital Library
Accelerated UV Test Methods for Encapsulants of Photovoltaic Modules
None
Date:
May 1, 2008
Creator:
Kempe, M. D.
System:
The UNT Digital Library
Characterization of 19.9% Efficient CIGS Absorbers
None
Date:
May 1, 2008
Creator:
Repins, I.; Contreras, M.; Romero, M.; Yan, Y.; Metzger, W.; Li, J. et al.
System:
The UNT Digital Library
Damp-Heat Induced Degradation of Transparent Conducting Oxides for Thin Film Solar Cells
The objectives are: (1) To achieve a high long-term performance reliability for the thin-film CIGS PV modules with more stable materials, device structure designs, and moisture-resistant encapsulation materials and schemes; (2) to evaluate the DH stability of various transparent conducting oxides (TCOs); (3) to identify the degradation mechanisms and quantify degradation rates; (4) to seek chemical and/or physical mitigation methods, and explore new materials. It's important to note that direct exposure to DH represents an extreme condition that a well-encapsulated thin film PV module may never experience.
Date:
May 1, 2008
Creator:
Pern, J.; Noufi, R.; Li, X.; DeHart, C. & To, B.
System:
The UNT Digital Library
Design of Shallow p-type Dopants in ZnO
ZnO is a promising material for short wave-length opto-electronic devices such as UV lasers and LEDs due to its large exciton binding energy and low material cost. ZnO can be doped easily n-type, but the realization of stable p-type ZnO is rather difficult. Using first-principles band structure methods the authors address what causes the p-type doping difficulty in ZnO and how to overcome the p-type doping difficulty in ZnO.
Date:
May 1, 2008
Creator:
Wei, S.H.; Li, J. & Y., Yan.
System:
The UNT Digital Library
Direct Comparison of Inverted and Non-inverted Growths of GaInP Solar Cells
The motivation for this presentation is that growing inverted cells may enable technological advances in solar cell fabrication, leading to higher efficiencies. Differences in dopant diffusion during inverted vs. upright growths may lead to differences in atomic depth profiles; changes in carrier concentrations; higher contact resistance and lower overall performance. This presentation summarizes that excellent performance is achievable in both upright and inverted configurations with proper consideration; subtle differences in depth profile QE and JV between upright and inverted growths due to dopant diffusion; and GaInAsN contact layer is resilient to length annealing and more work is necessary to determine why.
Date:
May 1, 2008
Creator:
Steiner, M. A.; Geisz, J. F.; Reedy,Jr. R. C. & Kurtz, S.
System:
The UNT Digital Library
Do the Defects Make it Work? Defect Engineering in π - Conjugated Polymer Films and Their Solar Cells
The summaries of this report are: (1) charged defects produce 10{sup 15}-10{sup 17} cm{sup -3} free carriers; (2) treatment with nucleophiles decreases p{sub f} and {sigma} while treatment with electrophiles does not change p{sub f} but increases {sigma}; (3) both treatments increase {mu}{sub p}, L{sub ex} and stability against photo-degradation; (4) charged defects can improve OPV by increasing conductivity and creating interfacial electric fields but they hurt {mu}{sub p}, L{sub ex} and chemical stability; and (5) a better way--synthesize materials without covalent defects and dope with purposely added, bound dopants.
Date:
May 1, 2008
Creator:
Gregg, B. A.; Wang, D.; Reese, M. O. & Kopidakis, N.
System:
The UNT Digital Library
Effects of Cu Diffusion From ZnTe:Cu/Ti Contacts on Carrier Lifetime of CdS/CdTe Thin Film Solar Cells
None
Date:
May 1, 2008
Creator:
Gessert, T. A.; Metzger, W. K.; Asher, S. E.; Young, M. R.; Johnston, S.; Dhere, R. G. et al.
System:
The UNT Digital Library
Excitonic Solar Cells: The Challenges of Efficiency and Durability
None
Date:
May 1, 2008
Creator:
Rumbles, G.
System:
The UNT Digital Library
Influence of Electrodes, Light, and Air on Organic Photovoltaic Stability and Various Device Protection Strategies
None
Date:
May 1, 2008
Creator:
Reese, M. O.; Morfa, A. J.; White, M. S.; Kopidakis, N.; Shaheen, S. E.; Rumbles, G. et al.
System:
The UNT Digital Library
Intrinsic DX Centers in Ternary Chalcopyrite Semiconductors
The conclusions of this report are: (1) intrinsic donor-type defects In{sub Cu}, Ga{sub Cu}, and V{sub Se}, and their complexes with V{sub Cu} cause metastability, but also act to limit V{sub OC}; (2) growth conditions which minimize these defects (Cu-rich/Se-rich) are very different from those currently used; and (3) overcoming V{sub OC} limitation requires to address other issues and trade-offs.
Date:
May 1, 2008
Creator:
Lany, S. & Zunger, A.
System:
The UNT Digital Library
Inverted GaInP/GaAs/InGaAs Triple-Junction Solar Cells with Low-Stress Metamorphic Bottom Junctions
None
Date:
May 1, 2008
Creator:
Geisz, J. F.; Kurtz, S. R.; Wanlass, M. W.; Ward, J. S.; Duda, A.; Friedman, D. J. et al.
System:
The UNT Digital Library
Investigation of Junction Properties of CdS/CdTe Solar Cells and their Correlation to Device Properties
The objective of the Junction Studies are: (1) understand the nature of the junction in the CdTe/CdS device; (2) correlate the device fabrication parameters to the junction formation; and (3) develop a self consistent device model to explain the device properties. Detailed analysis of CdS/CdTe and SnO{sub 2}/CdTe devices prepared using CSS CdTe is discussed.
Date:
May 1, 2008
Creator:
Dhere, R. G.; Zhang, Y.; Romero, M. J.; Asher, S. E.; Young, M.; To, B. et al.
System:
The UNT Digital Library
Liquid-Phase Quartz Crystal Microbalance for Photovoltaics Research
The construction of a new QCM-based flow reactor has been completed. Initial results include: (1) stable oscillation achieved with crystals sputter coated at 200 C with 500 nm ZnO; (2) sub-Hz noise level means << monolayer sensitivity; (3) Operation at elevated temperature possible after installation of membrane contactors; (4) determination of ZnO etch rates using dilute ethanolic NH{sub 4}Cl; (5) demonstration of use of an etchant as a probe of oxide-molecule interactions; (6) and use in flow rate-dependent CdS chemical deposition.
Date:
May 1, 2008
Creator:
Perkins, C. L. & Li, X.
System:
The UNT Digital Library
New Real-Time Quantum Efficiency Measurement System
None
Date:
May 1, 2008
Creator:
Young, D. L.; Egaas, B.; Pinegar, S. & Stradins, P.
System:
The UNT Digital Library
Optimizing Carbon Nanotube Contacts For Use In Organic Photovoltaics
None
Date:
May 1, 2008
Creator:
Barnes, T.; Blackburn, J.; Tenent, R.; Morfa, A.; Heben, M. & Coutts, T.
System:
The UNT Digital Library
Role of Polycrystalline Thin-Film PV Technologies in Competitive PV Markets
None
Date:
May 1, 2008
Creator:
von Roedern, Bolko & Ullal, Harin S.
System:
The UNT Digital Library
Stability of CIS/CIGS Modules at the Outdoor Test Facility Over Two Decades
None
Date:
May 1, 2008
Creator:
Del Cueto, J. A.
System:
The UNT Digital Library
Stress Induced Degradation Modes in CIGSS Minimodules
The experimental objectives of this report are: (1) compare the performance of modules exposed to high temperature and humidity; (2) determine the effects of different encapsulants on long term stability of CIGSS modules; and (3) analyze failure modes to determine areas in need of improvement.
Date:
May 1, 2008
Creator:
Kempe, M. D.; Terwilliger, K. & Tarrant, D.
System:
The UNT Digital Library