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Saturday, July 25, 2020 | History

3 edition of Process research on polycrystalline silicon material (PROPSM) found in the catalog.

Process research on polycrystalline silicon material (PROPSM)

Process research on polycrystalline silicon material (PROPSM)

quarterly report no. 8, October 1,1982-December 31, 1982

  • 158 Want to read
  • 18 Currently reading

Published by Jet Propulsion Laboratory in [Pasadena, Calif.? .
Written in English

    Subjects:
  • Solar batteries,
  • Silicon crystals

  • Edition Notes

    Statementby Jerry Culik, John H. Wohlgemuth
    SeriesNASA-CR -- 173753, JPL -- no. 9950-835, NASA contractor report -- 173753, JPL publication -- 9950-835
    ContributionsWohlgemuth, J. 1946-, Jet Propulsion Laboratory (U.S.), Solarex Corporation
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14928788M

      Polycrystalline, also known multicrystalline, is a newer technology and its manufacturing process can vary. Construction. Polycrystalline panels also start as a silicon crystal ‘seed’ placed in a vat of molten silicon. However, rather than drawing the silicon crystal seed up as with monocrystalline, the vat of silicon is allowed to cool. These materials are amorphous silicon (Si), thin-film polycrystalline silicon, CdTe, copper and indium selenide (CuInSe 2), and AsGa. All these materials can be deposited on affordable substrates, by a large number of methods potentially applicable on an industrial scale and ranging from vacuum techniques to simple chemical deposition methods.

    At present, the polycrystalline silicon produced by directional solidification is still the main material of photoelectric conversion for solar cells. It is of great significance to improve the quality of polysilicon and the production efficiency of polysilicon by using numerical simulation to guide the formulation of the main process. PROCESS RESEARCH ON POLYCRYSTALLINE SILICON MATERIAL (PROPSM) QUARTERLY REPORT NO. 8 October 1, - Decem Contract NO. The JPL Flat-Plate Solar Array Project is sponsored by the U.S. Department of Energy and forms part of the Solar Photovoltaic Conversion program to initiate a major effort toward the.

    The preparation of silicon single-crystal substrates with mechanically and chemically polished surfaces is the first step in the long and complex device fabrication process. In this chapter, the approaches currently used to prepare silicon materials (from raw materials to single-crystalline silicon) are discussed. Abstract: In fabricating the contact, the electrode layer of polycrystalline silicon whose rim portion is bonded via a layer portion of insulating material to the substrate, is used at least throughout the length of a part of its rim portion for the lateral delimitation of a etching process, as an etch mask, in the course of which a frame.


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Process research on polycrystalline silicon material (PROPSM) Download PDF EPUB FB2

Get this from a library. Process research in polycrystalline silicon material (PROPSM): final technical report. [Jerry Culik; Charles Y Wrigley; Solarex Corporation.; Jet. Get this from a library. Process research in polycrystalline silicon material (PROPSM): final technical report. [Jerry Culik; Jet Propulsion Laboratory (U.S.); Solarex Corporation.].

Polycrystalline silicon, or multicrystalline silicon, also called polysilicon or poly-Si, is a high purity, polycrystalline form of silicon, used as a raw material by the solar photovoltaic and electronics industry.

Polysilicon is produced from metallurgical grade silicon by a chemical purification process, called the Siemens process. This process involves distillation of volatile silicon.

Polycrystalline Structure Grains and Boundaries Source: U.S. Department of Energy, Material Science. DOE Fundamentals Handbook, Volume 1 and 2.

January Not all solids are single crystals (e.g. silicon semiconductors). Most crystalline solids are composed of a collection of many small crystals or grains of varying size and orientation. Recent reported results of hydrogen-passivated polycrystalline silicon solar cells are summarized.

Most of the studies have been performed on very small grain or short minority-carrier diffusion length silicon. Hydrogenated solar cells fabricated from this material appear to have effective minority-carrier diffusion lengths that are still not very long, as shown by the Author: J.

Culik. The resulting polycrystalline silicon films show large, elongated grains more than 3 mu m wide and mu m in length. The Hall effect hole mobility exceeds 25 cm(2)/Vs at. It is known that thin films of polycrystalline silicon, deposited under the right conditions, can be permeable to HF-based etching solutions.

While these films offer unique capabilities for microfabrication, both the poor reproducibility of the permeable film properties and the lack of a detailed physical understanding of the material have limited their application. 1. Introduction. At present, the quantity of global photovoltaic power generation is growing rapidly at a rate of about 30–40% per year [], and more than 90% of the global photovoltaic market depends on silicon-based solar cells [].However, polycrystalline silicon solar cells are dominant among them, the main reason is that polycrystalline silicon is rich in raw materials.

Purchase Materials and Process Characterization, Volume 6 - 1st Edition. Print Book & E-Book. ISBNPolycrystalline, theoretically dense silicon carbide was deposited onto graphite substrates via the reductive pyrolysis of methyltrichlorosilane in a hot-walled chemical vapor deposition (CVD) chamber.

The resulting product can be considered a bulk material with deposit thicknesses in the range of 4 to 8 millimeters. Performance limiting mechanisms in polycrystalline silicon are investigated by fabricating a matrix of solar cells of various thicknesses from polycrystalline silicon wafers of several bulk resistivities.

The analysis of the results for the entire matrix indicates that bulk recombination is the dominant factor limiting the short circuit current in large grain (greater than 1 to 2 mm. An investigation was begun into the usefulness of molecular hydrogen annealing on polycrystalline solar cells.

No improvement was realized even after twenty hours of hydrogenation. Thus, samples were chosen on the basis of: (1) low open circuit voltage; (2) low shunt conductance; and (3) high light generated current. These cells were hydrogenated in. Process research on polycrystalline silicon material (PROPSM): quarterly report no.

8, October 1,Decem The investigation of the performance limiting mechanisms in large grain (greater than mm in diameter) polycrystalline silicon was continued by fabricating a set of minicell wafers on a selection of 10 cm x 10 cm wafers.

A minicell wafer consists of an array of small (approximately sq cm in area) photodiodes which are isolated from one another by a mesa structure. L.A. Dobrzański, M.

Szczęsna, M. Szindler, A. Drygała, Electrical properties mono- and polycrystalline silicon solar cells, Journal of Achievements in Materials and Manufacturing Engineering   Add tags for "Process research in polycrystalline silicon material (PROPSM): quarterly report no.

2, January 1, through Ma ". Be the first. Similar Items. Introduction. Polycrystalline silicon (poly-Si) has many advantages such as stability against light soaking, better electrical conductivity, higher carrier mobility, and higher light absorption at longer wavelengths, compared to amorphous -Si is thus a material of interest and has been utilized in applications such as thin film transistors, liquid crystal displays, solar cells.

Production starts at silicon metal, which is the material used to gain high purity silicon. High purity silicon in different grades of purity is used for growing silicon ingots, which are sliced to wafers in a process called wafering.

Compositionally pure polycrystalline silicon wafers are useful for photovoltaics. Mechanisms limiting cell performance in large grain, cast, polycrystalline silicon sheet material were identified.

Solar cell fabrication processes, compatible with limiting mechanisms, to improve performance and a passivation process, which includes process sensitivity analysis were developed.

It is found that there is a strong correlation between quasineutral recombination. Micro-sized polycrystalline silicon particles were used as anode materials of lithium-ion battery.

The columbic efficiency of the first cycle reached a relatively high value of % after prelithiation and increased to 99 % in the second cycle. Furthermore, columbic efficiency remained above 99 % for up to + cycles. Process Research on Polycrystalline Silicon Material (PROPSM) NTRS Full-Text: View Document [PDF Size: MB] Author and Affiliation: Culik, J.

S. Hydrogenated solar cells fabricated from this material appear to have effective minority-carrier diffusion lengths that are still not very long, as shown by the open-circuit voltages of.

Polycrystalline silicon, also known as polysilicon or poly-Si, is a high-purity, polycrystalline form of silicon, produced from silicon metal by a chemical purification process, and is used as [email protected]{osti_, title = {Process for Polycrystalline film silicon growth}, author = {Wang, Tihu and Ciszek, Theodore F}, abstractNote = {A process for depositing polycrystalline silicon on substrates, including foreign substrates, occurs in a chamber at about atmospheric pressure, wherein a temperature gradient is formed, and both the atmospheric pressure and the .