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Analysis and evaluation in the production process and equipment area of the Low-Cost Solar Array Project. Quarterly report, January-April 1979

Description: Significant economic and technical data on the current front junction formation processes of Spectrolab's gaseous diffusion, and of involving the Varian-Extrion 200 to 1000 implanter were tabulated, and were used to judge the feasibility of diffusion proposals by Motorola and RCA and ion implantation proposals by Lockheed, Motorola, RCA, and Spire to meet future LSA-JPL guidelines. Cost calculations, consistent with the SAMICS methodology, were performed for the junction formation processes studied.
Date: June 1, 1979
Creator: Goldman, H. & Wolf, M.
Partner: UNT Libraries Government Documents Department

Analysis and evaluation of processes and equipment in Tasks II and IV of the Low-Cost Solar Array Project. Quarterly report, October 1977-January 1978

Description: Several experimental and projected Czochralski crystal growing process methods were studied and compared to available operations and cost-data of recent production Cz-pulling, in order to elucidate the role of the dominant cost contributing factors. From this analysis, it becomes apparent that substantial cost reductions can be realized from technical advancements which fall into four categories: an increase in furnace productivity; the reduction of crucible costs through use of the crucible for the equivalent of multiple state-of-the-art crystals; the combined effect of several smaller technical improvements; and a carry-over effect of the expected availability of semiconductor grade polysilicon at greatly reduced prices. Consequently, the specific add-on costs of the Cz-process can be expected to be reduced by about a factor of three by 1982, and about a factor of five by 1986. A format to guide in the accumulation of the data needed for thorough techno-economic analysis of solar cell production processes has been developed, called the University of Pennsylvania Process Characterization (UPPC) format, and has first been applied, as well as refined, in the Cz crystal pulling analysis. The accumulated Cz process data are presented in this format in the Appendix. The application of this UPPC format with the SAMICS cost and price determination methodology, at least in its Interim Price Estimating Guidelines (IPEG) form, has been established and is detailed.
Date: August 1, 1978
Creator: Goldman, H. & Wolf, M.
Partner: UNT Libraries Government Documents Department

Analysis and evaluation of processes and equipment in Tasks II and IV of the Low-Cost Solar Array Project. Quarterly report, April-July 1978

Description: The significant economic data for the current production multiblade wafering and inner diameter slicing processes were tabulated and compared to data on the experimental and projected Varian multiblade slurry, STC ID diamond coated blade, Yasunaga multiwire slurry and Crystal Systems fixed abrasive multiwire slicing methods. Cost calculations were performed for current production processes and for 1982 and 1986 projected wafering techniques.
Date: November 1, 1978
Creator: Goldman, H. & Wolf, M.
Partner: UNT Libraries Government Documents Department

Analysis and evaluation in the production process and equipment area of the low-cost solar array project

Description: The energy consumed in manufacturing silicon solar cell modules was calculated for the current process, as well as for 1982 and 1986 projected processes. In addition, energy payback times for the above three sequences are shown. The module manufacturing energy was partitioned two ways. In one way, the silicon reduction, silicon purification, sheet formation, cell fabrication, and encapsulation energies were found. In addition, the facility, equipment, processing matrial, and direct material lost-in-process energies were appropriated in junction formation processes and full module manufacturing sequences. A brief methodology accounting for the energy of silicon wafers lost-in-processing during cell manufacturing is described.
Date: August 1, 1979
Creator: Goldman, H. & Wolf, M.
Partner: UNT Libraries Government Documents Department

Analysis and evaluation in the production process and equipment area of the Low-Cost Solar Array Project. Quarterly report, April-July 1980

Description: After the influence of the metallization design on the performance of solar cells, particularly large area cells such as 10 cm x 10 cm size, has been analyzed, and a set of design rules derived from this analysis in the two preceding quarterly reports, this report deals with the available options for metal deposition. The principles underlying the different options are described. These options include chemical deposition methods, both electroless and electrolytic, and physical methods, which comprise the various types of vacuum deposition as well as the thick film processes. A qualitative comparison of the practical aspects of the application of these processes to solar cell manufacturing is given. The next quarterly report will contain the detailed economic data of these options, and an evaluation of these data.
Date: January 1, 1981
Creator: Goldman, H. & Wolf, M.
Partner: UNT Libraries Government Documents Department

Analysis and evaluation in the production process and equipment area of the low-cost solar-array project. Quarterly report, July-October, 1980

Description: The attributes of the various metallization processes have been investigated which express themselves in economic results. It has been shown that several metallization process sequences will lead to adequate metallization for large area, high performance solar cells at a metallization add-on price in the range of $6.- to 12.-/m/sup 2/, or 4 to 8 cents/W(peak), assuming 15% efficiency. Conduction layer formation by thick film silver or by tin or tin/lead solder leads to metallization add-on prices significantly above the $6.- to 12.-/m/sup 2/ range. The wet chemical processes of electroless and electrolytic plating for strike/barrier layer and conduction layer formation, respectively, seem to be most cost-effective. Vacuum deposition of the strike/barrier layer can be competitive with electroless plating.
Date: January 1, 1981
Creator: Wolf, M. & Goldman, H.
Partner: UNT Libraries Government Documents Department

Offline computing and networking

Description: This note summarizes the work of the Offline Computing and Networking Group. The report is divided into two sections; the first deals with the computing and networking requirements and the second with the proposed way to satisfy those requirements. In considering the requirements, we have considered two types of computing problems. The first is CPU-intensive activity such as production data analysis (reducing raw data to DST), production Monte Carlo, or engineering calculations. The second is physicist-intensive computing such as program development, hardware design, physics analysis, and detector studies. For both types of computing, we examine a variety of issues. These included a set of quantitative questions: how much CPU power (for turn-around and for through-put), how much memory, mass-storage, bandwidth, and so on. There are also very important qualitative issues: what features must be provided by the operating system, what tools are needed for program design, code management, database management, and for graphics.
Date: January 1, 1985
Creator: Appel, J.A.; Avery, P.; Chartrand, G.; Day, C.T.; Gaines, I.; Georgiopoulos, C.H. et al.
Partner: UNT Libraries Government Documents Department