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Modeling Cu Migration in CdTe Solar Cells Under Device-Processing and Long-Term Stability Conditions (Poster)

Description: An impurity migration model for systems with material interfaces is applied to Cu migration in CdTe solar cells. In the model, diffusion fluxes are calculated from the Cu chemical potential gradient. Inputs to the model include Cu diffusivities, solubilities, and segregation enthalpies in CdTe, CdS and contact materials. The model yields transient and equilibrium Cu distributions in CdTe devices during device processing and under field-deployed conditions. Preliminary results for Cu migration i… more
Date: May 1, 2008
Creator: Teeter, G. & Asher, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Solar Advisor Model User Guide for Version 2.0

Description: The Solar Advisor Model (SAM) provides a consistent framework for analyzing and comparing power system costs and performance across the range of solar technologies and markets, from photovoltaic systems for residential and commercial markets to concentrating solar power and large photovoltaic systems for utility markets. This manual describes Version 2.0 of the software, which can model photovoltaic and concentrating solar power technologies for electric applications for several markets. The cu… more
Date: August 1, 2008
Creator: Gilman, P.; Blair, N.; Mehos, M.; Christensen, C.; Janzou, S. & Cameron, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

EE&RE; Session: CIGS

Description: This project supports the Solar America Initiative by carrying out work on target topics identified for Photovoltaic Systems: (1) Improving cell and module efficiency of thin film Cu(In,Ga)Se2 materials; (2) Implementing the Science and Technology Facility (S&TF) and the Process Development and Integration Laboratory (PDIL) to facilitate laboratory/industry interaction in developing PV manufacturing technologies; (3) Addressing industrial issues in materials and manufacturing processes with… more
Date: April 1, 2008
Creator: Contreras, M.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department
open access

Solar San Diego: The Impact of Binomial Rate Structures on Real PV Systems; Preprint

Description: There is confusion in the marketplace regarding the impact of solar photovoltaics (PV) on the user's actual electricity bill under California Net Energy Metering, particularly with binomial tariffs (those that include both demand and energy charges) and time-of-use (TOU) rate structures. The City of San Diego has extensive real-time electrical metering on most of its buildings and PV systems, with interval data for overall consumption and PV electrical production available for multiple years. T… more
Date: May 1, 2008
Creator: VanGeet, O.; Brown, E.; Blair, T. & McAllister, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Renewable Energy Price-Stability Benefits in Utility Green Power Programs

Description: This paper examines utility experiences when offering the fixed-price benefits of renewable energy in green pricing programs, including the methods utilized and the impact on program participation. It focuses primarily on utility green pricing programs in states that have not undergone electric industry restructuring.
Date: August 1, 2008
Creator: Bird, L. A.; Cory, K. S. & Swezey, B. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced Power Electronic Interfaces for Distributed Energy Systems Part 1: Systems and Topologies

Description: This report summarizes power electronic interfaces for DE applications and the topologies needed for advanced power electronic interfaces. It focuses on photovoltaic, wind, microturbine, fuel cell, internal combustion engine, battery storage, and flywheel storage systems.
Date: March 1, 2008
Creator: Kramer, W.; Chakraborty, S.; Kroposki, B. & Thomas, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solar Photovoltaic Financing: Deployment on Public Property by State and Local Governments

Description: State and local governments have grown increasingly aware of the economic, environmental, and societal benefits of taking a lead role in U.S. implementation of renewable energy, particularly distributed photovoltaic (PV) installations. Recently, solar energy's cost premium has declined as a result of technology improvements and an increase in the cost of traditional energy generation. At the same time, a nationwide public policy focus on carbon-free, renewable energy has created a wide range of… more
Date: May 1, 2008
Creator: Cory, K.; Coughlin, J. & Coggeshall, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Strength of Si Wafers with Microcracks: A Theoretical Model (Poster)

Description: A new analytical expression that takes into account the surface, edge, and bulk properties of a wafer has been proposed to describe the strength of the brittle materials. A new proposed fracture-mechanics numerical simulation successfully predicted the strength of the cast silicon wafers. It has been shown that the predicted wafer strength distribution agrees well with the available experimental results.
Date: May 1, 2008
Creator: Rupnowski, P. & Sopori, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department

Liquid-Phase Quartz Crystal Microbalance for Photovoltaics Research

Description: 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 i… more
Date: May 1, 2008
Creator: Perkins, C. L. & Li, X.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Stress Induced Degradation Modes in CIGSS Minimodules

Description: 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.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department

Comparison of Predictive Models for PV Module Performance (Presentation)

Description: This paper examines three models used to estimate the maximum power (P{sub m}) of PV modules when the irradiance and PV cell temperature are known: (1) the power temperature coefficient model, (2) the PVFORM model, and (3) the bilinear interpolation model. A variation of the power temperature coefficient model is also presented that improved model accuracy. For modeling values of P{sub m}, an 'effective' plane-of-array (POA) irradiance (E{sub e}) and the PV cell temperature (T) are used as mode… more
Date: May 1, 2008
Creator: Marion, B.
Item Type: Refine your search to only Poster
Partner: UNT Libraries Government Documents Department
open access

Green Power Marketing in the United States: A Status Report (Tenth Edition)

Description: This report documents green power marketing activities and trends in the United States, focusing on consumer decisions to purchase electricity supplied from renewable energy sources and how this choice represents a powerful market support mechanism for renewable energy development. The report presents aggregate green power sales data for all voluntary purchase markets across the United States. It also provides summary data on utility green pricing programs offered in regulated electricity marke… more
Date: December 1, 2007
Creator: Bird, L.; Dagher, L. & Swezey, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

Design of Shallow p-type Dopants in ZnO

Description: 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.
Item Type: Refine your search to only Presentation
Partner: UNT Libraries Government Documents Department
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