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Book High Efficiency Silicon Solar Cells Report Number V

Download or read book High Efficiency Silicon Solar Cells Report Number V written by and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Some dditional statistical analyses of the first N(+)P bivariable experiment were made. The variance on this experiment was greater from run to run than within a run, at any given design point. A preliminary statistical experiment was performed on N(+)P cells having between 5 and 27 grid lines with diffusion times of 20 and 80 minutes. Half the cells were coated with SiO while half were not. Experimental results showed a flat optimum between 9 and 18 grid lines, and between the diffusion times of 20 and 80 min. With regard to the latter variable, the relative insensitivity of N(+)P cell efficiencies, as compared to P(+)N cell efficiencies, with variation of junction depth was again observed, and this insensitivity caused some difficulty in determining a clear superiority of one diffusion time over the other due to the masking effects of other variables. Cells having total cell series resistances of less than 0.20 ohms were fabricated. Polycrystalline cells showed sunlight conversion efficiencies of as high as 11%. (Author)

Book High Efficiency Silicon Solar Cells

Download or read book High Efficiency Silicon Solar Cells written by Martin A. Green and published by Trans Tech Publications Ltd. This book was released on 1987-01-01 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: The early chapters comprehensively review the optical and transport properties of silicon. Light trapping is described in detail. Limits on the efficiency of silicon cells are discussed as well as material requirements necessary to approach these limits. The status of current approaches to passifying surfaces, contacts and bulk regions is reviewed. The final section of the book describes the most practical approaches to the fabrication of high-efficiency cells capable of meeting the efficiency targets for both concentrated and non-concentrated sunlight, including a discussion of design and processing approaches for non-crystalline silicon.

Book High Efficiency Silicon Solar Cells Report Number II

Download or read book High Efficiency Silicon Solar Cells Report Number II written by and published by . This book was released on 1963 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book High Efficiency Silicon Solar Cells Report Number I

Download or read book High Efficiency Silicon Solar Cells Report Number I written by and published by . This book was released on 1962 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Silicon Heterojunction Solar Cells

Download or read book Silicon Heterojunction Solar Cells written by W.R. Fahrner and published by Trans Tech Publications Ltd. This book was released on 2006-08-15 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world of today must face up to two contradictory energy problems: on the one hand, there is the sharply growing consumer demand in countries such as China and India. On the other hand, natural resources are dwindling. Moreover, many of those countries which still possess substantial gas and oil supplies are politically unstable. As a result, renewable natural energy sources have received great attention. Among these, solar-cell technology is one of the most promising candidates. However, there still remains the problem of the manufacturing costs of such cells. Many attempts have been made to reduce the production costs of “conventional” solar cells (manufactured from monocrystalline silicon using diffusion methods) by instead using cheaper grades of silicon, and simpler pn-junction fabrication. That is the ‘hero’ of this book; the heterojunction solar cell.

Book High Efficiency Silicon Solar Cells Report Number III

Download or read book High Efficiency Silicon Solar Cells Report Number III written by and published by . This book was released on 1963 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: An additional mirror was added to the solar concentrator equipment so that is possible to make solar cell measurements at approximately 5 gm- calories/sq cm/min solar intensity. The concentrator was used to verify the sunlight power predictions made from tungsten power measurements during the P() /N bivariable experiment. A general equation was developed for the theoretical determination of the total cell series resistance from a knowledge of the values of the component resistances. The equations were utilized to predict the series resistance of produc tion type N()/P and N()/N cells.

Book High Efficiency Silicon Solar Cells Report Number VII

Download or read book High Efficiency Silicon Solar Cells Report Number VII written by and published by . This book was released on 1964 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Five hundred P(+)/N and five hundred N(+)/P cells have been fabricated on a pilot line basis. There was a 70% yield of P(+)/N cells having a 100 mW/sq cm sunlight efficiency of 11.4% or greater. There was a 70% yield of N(+)/P cells having a 100 mW/sq cm sunlight efficiency of 10.1% or greater. Preliminary measurements indicate a substantial increase in efficiency for both cell types at solar intensities of approximately 300 mW/sq cm, due to the specific design of these cells for operation at these intensities, thus showing good performance for operation in systems utilizing solar concentrators. Comparisons are made between the pilot line N(+)/P and P(+)/N cells; and between these cells and commercially available production cells of both polarities. Cost estimates are given on the basis of the yields obtained.

Book High Efficiency Silicon Solar Cells Report Number Vi

Download or read book High Efficiency Silicon Solar Cells Report Number Vi written by Paul A. Berman and published by . This book was released on 1964 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of the performance of the pilot line cells fabricated during the fourth quarter indicate that the basic cell design remains highly efficient at intensities up to 2000 mW/sq cm, showing a significant improvement in the state of the art. Attempts to significantly reduce cell costs by replacing the rather lengthy junction clean-up etch by a simple edge sanding operation have shown that while some modified techniques may have value in this area, the specific technique use in the experiment resulted in too great a power loss to be of value in reducing the cost per watt ratio. Some alternate techniques are proposed. Results are presented of an experiments to determine the effect of virgin and scrap polycrystalline material on the efficiency of polycrystalline cells. The results were somewhat masked by the fact that five of the eight ingots purchased as polycrystalline material were actually partially single crystalline in nature. An appendix is included describing a radiation experiment on N+/P polycrystalline cells and the results are compared to those obtained on single crystalline cells in various light sources. The results indicate that the N/P polycrystalline and single crystalline cells degrade to the same power value at a flux of about 10 to the 14th power electrons/sq cm in a sunlight source, with the per cent degradation being considerably smaller for the former cell type. (Author).

Book High Efficiency Silicon Solar Cells Report Number VIII

Download or read book High Efficiency Silicon Solar Cells Report Number VIII written by and published by . This book was released on 1964 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments leading to an optimized design for N+/P and P+/N solar cells which are to be utilized in a terrestrial environment at a solar intensity of about 350 mW/sq cm are described. The same cell design is shown to be optimized for 100 mW/sq cm earth's surface solar intensities as well. It is found that the results of the experiments can be predicted from theory to a good approximation. Pilot line production of cells utilizing the optimized design is described and yield distributions are presented. Good efficiency yields are found to occur for both polarities, however the yield distribution of the P+/N cells is superior to that of the N+/P cells. The P+/N distribution peaks in the 13.5-14.0% efficiency range with a yield of 70% of the cells having an efficiency of 12.9% or greater. The yield distributions are discussed in the light of further analysis of the electrical characteristics of the cells. (Author).

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book High Efficiency Silicon Solar Cells Report Number IV

Download or read book High Efficiency Silicon Solar Cells Report Number IV written by and published by . This book was released on 1963 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Five hundred P(+)/N and five hundred N(+)/P cells have been fabricated on a pilot line basis. There was a 70% yield of P(+)/N cells having a 100 mW/sq cm sunlight efficiency of 11.4% or greater. There was a 70% yield of N(+)/P cells having a 100 mW/sq cm sunlight efficiency of 10.1% or greater. Preliminary measurements indicate a substantial increase in efficiency for both cell types at solar intensities of approximately 300 mW/sq cm, due to the specific design of these cells for operation at these intensities, thus showing good performance for operation in systems utilizing solar concentrators. Comparisons are made between the pilot line N(+)/P and P(+)/N cells; and between these cells and commercially available production cells of both polarities. Cost estimates are given on the basis of the yields obtained.

Book Solar Energy Update

Download or read book Solar Energy Update written by and published by . This book was released on 1981-04 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: