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Process feasibility study in support of silicon material, Task I. Quarterly technical progress report (XVIII), December 1, 1979-February 29, 1980

Description: Analyses of process system properties were continued for important chemical materials involved in the several processes under consideration for semiconductor and solar cell grade silicon production. Major activities were devoted to physical, thermodynamic and transport property data for silicon. Property data are reported for vapor pressure heat of vaporization, heat of sublimation, liquid heat capacity and solid heat capacity as a function of temperature to permit rapid usage in engineering. C… more
Date: March 1, 1980
Creator: Yaws, C.L. & Li, K.Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conceptual design and systems analysis of photovoltaic power systems. Volume II. Systems. Revised final report

Description: Conceptual designs were made and analyses were performed on three types of solar photovoltaic power systems. Included were Residential (1--10 kW), Intermediate (0.1--10 MW), and Central (50--1000 MW) Power Systems to be installed in the 1985 to 2000 time period. Detailed descriptions of each of the three systems studied, descriptions of the necessary subsystems, and discussions of the interfaces between them are presented. Included also are descriptions of system performance and system cost use… more
Date: March 1, 1977
Creator: Pittman, P.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of mechanically hard, chemically inert antireflection coatings for photovoltaic solar modules. Final technical report, April 1, 1980-March 31, 1981

Description: The overall objective of this program is to determine the optical properties of i-Carbon (diamond-like) films and determine if these films can be developed into antireflecting (AR) coatings for silicon solar cells. The i-C films have been produced on glass, silicon, and KCl by radio frequency (RF) plasma decomposition of the alkane gases. Films were also produced on silicon solar cells by low-energy ion beam techniques. These coatings did not perform as well as those made from hydrocarbon gases… more
Date: March 31, 1981
Creator: Moravec, T.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Deposition, Fabrication and Analysis of Polycrystalline Silicon MIS Solar Cells. Final Report, January 1-December 31, 1979

Description: Discussion of MIS cell fabrication techniques, protovoltaic response data, I-V-T analysis to reveal conduction mechanisms, a detailed computer model, optimum MIS solar cell design, surface state effects, Auger studies, reliability studies and e-beam deposition of thin silicon films are included. The most important features of the work during 1979 include the one pump-down fabrication process, establishing a consistent fabrication sequence, achieving 13% efficiency of 2 cm/sup 2/ area, an evalua… more
Date: March 1, 1980
Creator: Anderson, W. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of photovoltaic mechanisms in polycrystalline thin-film solar cells. Interim technical report, November 1, 1980-July 31, 1981

Description: Effort is reported on measurement technique development to assess the utility of Deep-Level Transient Spectroscopy (DLTS) methods in characterizing polycrystalline silicon that was deliberately doped with Ti during growth. Difficulties encountered with lateral DLTS measurements are discussed. In this approach, modulation of the grain boundary, double-depletion region produces the entire DLTS signal. Major effort has been applied in grain boundary characterization and control. The most significa… more
Date: March 5, 1982
Creator: Temofonte, T. A.; Szedon, J. R. & O'Keeffe, T. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Interconnect fatigue design for terrestrial photovoltaic modules

Description: Fatigue of solar cell electrical interconnects due to thermal cycling has historically been a major failure mechanism in photovoltaic arrays; the results of a comprehensive investigation of interconnect fatigue that has led to the definition of useful reliability-design and life-prediction algorithms are presented. Experimental data gathered in this study indicate that the classical strain-cycle (fatigue) curve for the interconnect material is a good model of mean interconnect fatigue performan… more
Date: March 1, 1982
Creator: Mon, G. R.; Moore, D. M. & Ross, R. G., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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(Investigation of low-cost solar cells based on Cu/sub 2/O). Third quarterly progress report, November 1, 1979-January 31, 1980

Description: Efforts this quarter concentrated on completion and check-out of the MBE system, deposition of ZnS films, analysis of the internal photoresponse for Cu-Cu/sub 2/O cells, and fabrication and characterization of Cu-Cu/sub 2/O solar cells. In-doped ZnS films with very good optical quality and finite conductivity were obtained by co-depositing In and ZnS. Analysis of the internal photoresponse indicated that minority carrier diffusion lengths on the order of 10 ..mu..m are being achieved with the p… more
Date: March 12, 1980
Creator: Olsen, L. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electromagnetic compatibility, tropospheric and ionospheric aspects of SPS MPTS operations

Description: The results of a preliminary study of the effects of operation of a Solar Power Satellite (SPS) on the general performance of terrestrial and space based electromagnetic systems are given. In addition, the effects of a passing high energy Microwave Power Transmission System (MPTS) through the troposphere and through the ionosphere are also considered. The SPS as envisioned will be a satellite system in geosynchronous orbit with a solar array of about 144 square kilometers. The purpose of the SP… more
Date: March 1, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Large area silicon sheet by EFG. Annual progress report, October 1, 1978-September 30, 1979

Description: The progress which has been made in 1978/1979 to evolve systems designs for growth stations which produce multiple silicon ribbons by the EFG process is reported. This progress culminated in the demonstration of five ribbon multiple growth in May 1979 and in recent advances toward improved electronic quality of ribbons grown from these machines. These advances were made in large measure by studies in which the composition of the gas environment around the meniscus area was varied. By introducin… more
Date: March 14, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of copper sulfide/cadmium sulfide thin-film solar cells

Description: The most important accomplishments during this period were to demonstrate and to elucidate further the complex effects that occur during the aging of Cu/sub 2/S/CdS thin-film solar cells in flowing wet oxygen. There are two distinct effects. At constant illumination, the short-circuit current of cells aged at room temperature consistently decreases with time. The second effect, related to diode opposing current, is more involved and may result from several competing mechanisms. Over the short t… more
Date: March 8, 1982
Creator: Szedon, J. R.; Biter, W. J. & Dickey, H. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Vacuum deposited polycrystalline silicon films for solar cell applications. Quarterly report, September 15-December 31, 1979

Description: Polycrystalline silicon films 14-22 ..mu..m thick and with average grain diameters of 20-40 ..mu..m were deposited by vacuum deposition onto both ceramic and sapphire substrates which were previously coated with a thin (1-2 ..mu..m) TiB/sub 2/ conducting layer. The large grains are the result of an interaction in the initial growth stages between silicon and TiB/sub 2/. SIMS studies of B/Ti/Al/sub 2/O/sub 3/, B/Al/sub 2/O/sub 3/, and Ti/Al/sub 2/O/sub 3/, interactions are reported as part of a … more
Date: March 1, 1980
Creator: Feldman, C.; Arrington, C. H.; Blum, N. A. & Satkiewicz, F. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of high efficiency cascade solar cells. Quarterly technical progress report No. 3

Description: Progress is reported in the following areas: AlGaAsSb/GaAsSb materials development, GaInP materials development via VPE, GaAlAs/GaAs cell development, and OM/CVD studies. Spectral response, V-I characteristics, and electron microprobe analysis results are presented. (WHK)
Date: March 31, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conceptual design and systems analysis of photovoltaic systems. Volume I. Study summary. Final report

Description: This investigation of terrestrial PV systems considered the technical and economic feasibility for systems in three size categories: a small system of about 12 kW peak output for on-site residential use; a large 1500 MW central power plant contributing to the bulk energy of a utility system power grid; and an intermediate size system of about 250 kW for use on public or commercial buildings. In each category, conceptual designs were developed, performance was analyzed for a range of climatic re… more
Date: March 19, 1977
Creator: Kirpich, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Large-area sheet task advanced dendritic web growth development. Quarterly report, October 23, 1983-December 31, 1983

Description: Two types of design concepts were evaluated with the thermal models: (1) a vertical thermal element which modifies both the temperature profile in the web as well as the convective gas flow near the web; and (2) a thinner lid configuration in which the second lid is replaced by a hot cavity. Each involves trade-offs which need experimental evaluation. Residual stress measurements using the serial split-width technique indicated that the real residual stress was comparable to (or less than) the … more
Date: March 6, 1984
Creator: Duncan, C. S.; Seidensticker, R. G. & McHugh, J. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Solar-collector manufacturing activity, July through December, 1981

Description: Solar thermal collector and solar cell manufacturing activity is both summarized and tabulated. Data are compared for three survey periods (July through December, 1981; January through June, 1981; and July through December, 1980). Annual totals are also provided for the years 1979 through 1981. Data include total producer shipments, end use, market sector, imports and exports. (LEW)
Date: March 1, 1982
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Photovoltaic Subcontract Program, FY 1991

Description: This report summarizes the fiscal year (FY) 1991 (October 1, 1990, through September 30, 1991) progress of the subcontracted photovoltaic (PV) research and development (R D) performed under the Photovoltaic Advanced Research and Development Project at the National Renewable Energy Laboratory (NREL) -- formerly the Solar Energy Research Institute (SERI). The mission of the national PV program is to develop PV technology for large-scale generation of economically competitive electric power in the… more
Date: March 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of selected chemical processes for production of low-cost silicon: Phase III. Silicon Material Task, Low-Cost Solar Array Project. Sixteenth/seventeenth quarterly progress report, July-December 31, 1979

Description: The method under development for the production of semiconductor grade silicon is based on the zinc vapor reduction of silicon tetrachloride in a fluidized bed of seed particles. Construction of the PDU was completed during the report period, the fluidized-bed reactor was coated internally with silicon/SiC, and the operation of several systems was checked out. However, problems with the zinc feed system, unrelated to its basic operability, delayed introduction of zinc vapor to the PDU. At the e… more
Date: March 7, 1980
Creator: Blocher, J.M. Jr. & Browning, M.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Solid State Division: Progress report for period ending September 30, 1987

Description: This paper contains a collection of articles on research done at the Solid State Division of ORNL. General topics covered are: theoretical solid state physics; neutron scattering; physical properties of superconductors and ceramics; synthesis and characterization of solids; ion beam and laser processing; and surface and defect studies. (LSP)
Date: March 1, 1988
Creator: Green, P. H. & Watson, D. M. (eds.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conceptual design and systems analysis of photovoltaic systems. Volume II. Study results. Final report

Description: This investigation of terrestrial PV systems considered the technical and economic feasibility for systems in three size categories: a small system of about 12 kW peak output for on-site residential use; a large 1500 MW central power plant contributing to the bulk energy of a utility system power grid; and an intermediate size system of about 250 kW for use on public or commercial buildings. In each category, conceptual designs were developed, performance was analyzed for a range of climatic re… more
Date: March 19, 1977
Creator: Kirpich, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Safety-related requirements for photovoltaic modules and arrays. Final report

Description: Underwriters Laboratories has conducted a study to identify and develop safety requirements for photovoltaic module and panel designs and configurations for residential, intermediate, and large scale applications. Concepts for safety systems, where each system is a collection of subsystems which together address the total anticipated hazard situation, are described. Descriptions of hardware, and system usefulness and viability are included. This discussion of safety systems recognizes that ther… more
Date: March 1, 1984
Creator: Levins, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Photovoltaic-systems test facilities: existing capabilities compilation

Description: Photovoltaic Systems Test Facilities (PV-STFs) are used to evaluate complete photovoltaic systems, subsystems, and their interfaces. A general description of PV-STFs presently operated under the US Department of Energy's National Photovoltaics Program is presented, as well as descriptions of a number of privately operated facilities reflecting current understanding of those having test capabilities appropriate to PV hardware development. A summary of specific, representative test capabilit… more
Date: March 1, 1982
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reliability engineering in solar energy: workshop proceedings

Description: A workshop to reveal the scope of reliability-related activities in solar energy conversion projects and in nonsolar segments of industry is described. Two reliability programs, one in heating and cooling and one in photovoltaics, are explicated. This document also presents general suggestions for the establishment of a unified program for reliability, durability, maintainability, and safety (RDM and S) in present and future solar projects.
Date: March 1, 1980
Creator: Gross, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low cost silicon process development. Phase III: process optimization and evaluation. Third quarterly technical progress report

Description: The goal of the Low Cost Silicon Process Development project is to determine technical and economic feasibility of a tribromosilane-based process for the production of Solar Cell Grade Silicon. To accomplish this project goal, three principal tasks have been defined: (1) an experimental chemistry task; (2) a mini-plant design and construction task; and (3) a mini-plant operation and evaluation task. The scope of the experimental chemistry task includes optimization of the process with design ve… more
Date: March 1, 1980
Creator: Moore, E.; Newman, C. & Messina, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Photovoltaic subsystem optimization and design tradeoff study. Final report

Description: Tradeoffs and subsystem choices are examined in photovoltaic array subfield design, power-conditioning sizing and selection, roof- and ground-mounted structure installation, energy loss, operating voltage, power conditioning cost, and subfield size. Line- and self-commutated power conditioning options are analyzed to determine the most cost-effective technology in the megawatt power range. Methods for reducing field installation of flat panels and roof mounting of intermediate load centers are … more
Date: March 1, 1982
Creator: Stolte, W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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