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in subjects: "Films"

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Proceedings of the flat-plate solar array project research forum on photovoltaic metallization systems

A Photovoltaic Metallization Research Forum, under the sponsorship of the Jet Propulsion Laboratory's Flat-Plate Solar Array Project and the US Department of Energy, was held March 16-18, 1983 at Pine Mountain, Georgia. The Forum consisted of five sessions, covering (1) the current status of metallization systems, (2) system design, (3) thick-film metallization, (4) advanced techniques and (5) future metallization challenges. Twenty-three papers were presented.

Date: November 15, 1983

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Modeling studies on the precipitation of Kr after implantation into metals

A rate-theory approach is applied to interpreting observations on the precipitation of Kr injected into Ni at temperatures between 25 and 560/degree/C. At temperatures of 400/degree/C or higher, the implanted Kr precipitates evolve into a bi-modal size distribution containing small solid precipitates and an additional population of larger, faceted bubbles. The calculations explore the dependence of the observed bi-modal distribution on the maximum size of the solid Kr precipitates and the effec… more

Date: February 1, 1988

Creator: Rest, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Indium phosphide/cadmium sulfide thin-film solar cells. Quarterly technical progress report No. 3, December 1979-April 1980

Thin films (approx. 1 ..mu..m thick) and large grains (approx. 40 x 40 ..mu..m) of InP were epitaxially deposited on low-cost recrystallized CdS (RXCdS) substrates at 280/sup 0/C by planar reactive deposition. At 380/sup 0/C, a 0.4- to 1.0-..mu..m-thick In-Cd-S transition layer between the InP and the RXCdS degrades the quality of the InP epitaxy. However, p-type InP films were prepared at this temperature by Be-doping and capping the entire RXCdS substrate with InP. Large grains of CdTe (appro… more

Date: June 1, 1980

Creator: Zanio, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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INTERACTION OF TWO-DIMENSIONAL, STRATIFIED, TURBULENT AIR--WATER AND STEAM-- WATER FLOWS.

No Description Available.

Date: January 1, 1968

Creator: Linehan, J.H.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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Development of passive electronic components for instrumentation of improved geothermal logging tools and components. Annual progress report

Short term objectives for well-logging instrumentation are circuits which can operate at temperatures in the range 275/sup 0/C to 350/sup 0/C; the medium term goal is operation up to 500/sup 0/C, and the long term goal is to achieve operation at 1000/sup 0/C. It is apparent that useful electronic circuits will require the combination of both passive components and active devices. In order to meet the compatibility requirements, the basic technology which has been selected in this project is the… more

Date: October 20, 1977

Creator: Raymond, L.S.; Hamilton, D.J. & Kerwin, W.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Investigations of CuInSe sub 2 Thin Films and Contacts

This report describes research into electrical contacts for copper indium diselenide (CuInSe{sub 2}) polycrystalline thin films used for solar cell applications. Molybdenum contacts have historically been the most promising for heterojunction solar cells. This program studied contact stability by investigating thermally induced bilayer reactions between molybdenum and copper, indium, and selenium. Because selenization is widely used to fabricate CuInSe{sub 2} thin films for photovoltaic cells, … more

Date: October 1, 1991

Creator: Nicolet, M. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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High-temperature oxidation and corrosion of materials program

Research progress is reported in the behavior of metals and alloys in gas mixtures at high temperature, corrosion mechanisms in complex environments of low oxidizing potential, hot corrosion of nickel-base alloys at intermediate temperatures, corrosion of solid sulfate deposits, adherence of Al/sub 2/O/sub 3/ oxide films, oxidation behavior of a two-phase alloy Fe-44% Cu, and formation of subscales of varying composition. (FS)

Date: March 1, 1980

Creator: Whittle, D.P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Surfaces and Thin Films Studied by Picosecond Ultrasonics

This research is the study of thin films and interfaces via the use of the picosecond ultrasonic technique. In these experiments ultrasonic waves are excited in a structure by means of a picosecond light pulse ( pump pulse''). The propagation of these waves is detected through the use of a probe light pulse that is time-delayed relative to the pump. This probe pulse measures the change {Delta}R(t) in the optical reflectivity of the structure that occurs because the ultrasonic wave changes the o… more

Date: May 1, 1992

Creator: Maris, J. H. & Tauc, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Surface, interface and thin-film magnetism

In the last quarter of the 20th century, with the information revolution and the ever growing need to acquire, store, and retrieve information, the science and technologies attached to magnetic recording have experienced an explosive growth. Central to those pursuits has been the materials science of magnetism as it applies to surfaces, interfaces, and thin films. This report discusses topics on thin-film magnetism such as: theory, physical effects, prospects, opportunities and future developme… more

Date: July 1, 1991

Creator: Falicov, L.M. (Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Physics)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A replaceable reflective film for solar concentrators

The 3M Company manufactures a silvered acrylic film called ECP-305 that is regarded as the preferred reflective film for use on stretched-membrane heliostats. However, ECP-305 will degrade in time, due to both corrosion of the silver layer and delamination at the film's silver-to-acrylic interface, and will eventually need to be replaced. 3M uses a very aggressive adhesive on this film, and once it is laminated, replacement is very difficult. The purpose of this investigation was the developmen… more

Date: September 1, 1991

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The use of BaF sub 2 buffer layers for the sputter-deposition of TlCaBaCuO thin-film superconductors

Thin films of the Tl-based superconductors often have relatively poor properties because of film/substrate interdiffusion which occurs during the anneal. We have therefore investigated the use of BaF{sub 2} as a diffusion barrier. TlCaBaCuO thin films were deposited by dc magnetron sputtering onto MgO <100> substrates, both with and without an evaporation-deposited BaF{sub 2} buffer layer, and post-annealed in a Tl over-pressure. Electrical properties of the films were determined by four-point … more

Date: January 1, 1989

Creator: Hubbard, K. M.; Arendt, P. N.; Brown, D. R.; Cooke, D. W.; Elliott, N. E.; Farr, J. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Laser deposition and laser modification of high-temperature superconducting thin films

Applications of high-temperature superconductors (HTSC) may require epitaxial films with {Tc}{ge}77 K, and J{sub c}{ge}10{sup 6} A/cm{sup 2}. In situ pulsed laser deposition (PLD) is suitable for fabrication of such films. We report parametric studies on the effect of laser and processing parameters on the crystallinity, epitaxy and electrical properties of laser-deposited HTSC thin films. In addition, several laser-based processes were used to modify the electrical properties ({Tc} and J{sub c… more

Date: January 1, 1991

Creator: Dye, R. C.; Foltyn, S. R.; Nogar, N. S.; Wu, X. D.; Peterson, E. J. & Muenchausen, R. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Thin film cadmium telluride solar cells. Final technical report, July 1, 1979-August 31, 1980

Efforts during this program have been directed to the construction of apparatus for the chemical vapor deposition of cadmium telluride films, the selection and preparation of substrates, the deposition and characterization of cadmium telluride films, and the fabrication and characterization of solar cells. Cadmium telluride films have been deposited on a number of substrates by the direct combination of cadmium and tellurium on the substrate surface at 500/sup 0/C or higher at rates of up to 0.… more

Date: August 1, 1980

Creator: Chu, T. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Synchrotron x-ray study of physisorbed films of mixtures of Ar and Xe on graphite

Mixtures of Ar and Xe have been studied in most of the submonolayer region of the phase diagram (T,chi,rho), T = temperature, chi = chemical composition, rho = fraction of a monolayer. The basic feature is a large tendency to form ..sqrt.. 3 x ..sqrt.. 3 commensurate alloys (Kr-like structures), but none of the commensurate nor of the incommensurate structures form a chemically ordered alloy at 11 K. Thus the 2D solid can be thought of as a solid consisting of particles of an average size. This… more

Date: July 1, 1982

Creator: Bohr, J.; Nielsen, M.; McTague, J. P.; Als-Nielsen, J. & Kjaer, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Multivariate calibration applied to the quantitative analysis of infrared spectra

Multivariate calibration methods are very useful for improving the precision, accuracy, and reliability of quantitative spectral analyses. Spectroscopists can more effectively use these sophisticated statistical tools if they have a qualitative understanding of the techniques involved. A qualitative picture of the factor analysis multivariate calibration methods of partial least squares (PLS) and principal component regression (PCR) is presented using infrared calibrations based upon spectra of… more

Date: January 1, 1991

Creator: Haaland, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Soft x-ray resonant magnetic scattering study of thin films and multilayers

A brief review of using soft x-ray resonant magnetic scattering in the study of magnetic thin films and multilayers is given. Results from recent studies of thin Fe films and Fe/Gd multilayers are used as examples to demonstrate the information can be obtained and the unique features of this technique. Comparison is also made with related techniques: magneto-optical Kerr effect, Faraday effect, and magnetic circular dichroism. 9 refs., 4 figs.

Date: January 1, 1991

Creator: Kao, C. C.; Johnson, E. D.; Hastings, J. B.; Siddons, D. P. (Brookhaven National Lab., Upton, NY (United States)) & Vettier, C. (European Synchrotron Radiation Facility, 38 - Grenoble (France))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Pulsed CO sub 2 laser processing of thin ion-implanted silicon layers

We show that extremely shallow ({approx lt} 800 {Angstrom}) melt depths can be easily obtained by irradiating a thin heavily doped silicon layer with a CO{sub 2} laser pulse. Since the absorption of the CO{sub 2} laser pulse is dominated by free-carrier transitions, the beam heating occurs primarily in the thin degenerately doped film. For CO{sub 2} pulse-energy densities exceeding a threshold value, surface melting occurs and the reflectivity of the incident laser pulse increases abruptly to a… more

Date: January 1, 1988

Creator: James, R.B. (Sandia National Labs., Livermore, CA (United States)) & Christie, W.H. (Oak Ridge National Lab., TN (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Chemical Vapor Deposition of Refractory Metal Reflectors for Spectrally Selective Solar Absorbers. Annual Report, May 1, 1978-April 30, 1979

Three methods are described to fabricate by chemical vapor deposition (CVD) molybdenum films which rival conventional mirror materials in their infrared reflectance. With an absolute reflectance of 97.4% at 10 ..mu..m, these Super Molybdenum films reflect better than any other molybdenum film previously reported. When deposited in the presence of oxygen, films of a reduced reflectance over the solar emission range result. If passivated and antireflected by a Si/sub 3/N/sub 4/ layer, such Black … more

Date: May 1, 1979

Creator: Seraphin, B. O. & Carver, G. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Soft x-ray transmission gratings

A technique was developed for producing transmission diffraction gratings suitable for use in the soft x-ray region. Thin self-supporting films of a transparent material are overlaid with several thousand opaque metallic strips per mm. Gratings with 2100, 2400, and 5600 1/mm have been produced and tested. Representative spectra over the wavelength range from 17.2 to 40.0 nm are given for a grating consisting of a 120-nm-thick Al support layer overlaid with 2400, 34-nm-thick, Ag strips/mm. The a… more

Date: January 1, 1980

Creator: Arakawa, E.T.; Caldwell, P.J. & Williams, M.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Superconducting fault current limiter. Sixth quarterly technical progress report, November 8, 1979-February 7, 1980

Progress in developing an improved superconducting fault current limiter (SCFCL) is described. A mathematical model of the most promising SCFCL design was used for determining transient characteristics, thermal recovery characteristics, and for evaluating types of shunt resistors. Some experimental work was done on Nb/sub 3/Sn film properties. (LCL)

Date: January 1, 1980

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Optimization of film synthesized rare earth transition metal permanent magnet systems

Progress is reported in three areas: high coercivity Sm-Fe-Ti-V, Sm-Fe-Zr, and two element Sm-Fe Sm{sub 5}(Fe,T){sub 17} type crystalline phases; ThMn{sub 12} type pseudobinary SmFe{sub 12-x}T{sub x}(0{le}{times}{le}1.5); and sputter process control for the synthesis of precisely textured rare earth-transition metal magnetic films. (DLC)

Date: January 1, 1992

Creator: Cadieu, F.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Metal-insulator-semiconductor photovoltaic devices

The overall objective of this program is to conduct research on metal-insulator-semiconductor (MIS) solar cells to improve understanding of the basic parameters which control photovoltaic processes in these cell structures. Current work includes fabrication, characterization, and theoretical studies of single crystal silicon-based cells, with Si0/sub x/ as the insulating film and Al or Au as the front metal contact. Studies of these two systems are intended to provide needed reference systems f… more

Date: June 1, 1979

Creator: Olsen, L. C.; Garnier, J. E. & Turcotte, R. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Controlled cadmium telluride thin films for solar cells applications. First quarterly report, June 1, 1980-September 1, 1980

During the first quarter of this renewed program, efforts have been extended mainly to set up a new ion beam sputtering system that would replace our existing r.f. sputtering system for the fabrication of doped CdTe thin films for solar cell applications. Preliminary attempts with this new equipment resulted in films with rather large grain size (0.8..mu.. - 1..mu..m) at an elevated substrate temperature. While this in itself is encouraging, certain difficulties were confronted in achieving the… more

Date: September 1, 1980

Creator: Das, M. B. & Krishnaswamy, S. V.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Soft x-ray magnetic scattering study of thin films and multilayers

A brief discussion of the resonant magnetic scattering process is given. Results from recent studies of thin Fe films and Fe/Gd multilayers are used as examples to demonstrate the information can be obtained and the unique features of this techniques: large resonant enhancement, sensitivity to magnitization, elemental specificity, and tunability of the penetration depth. Comparison is made with related techniques: magneto-optical Kerr effect, Faraday effect, and magnetic circular dichroism. 9 r… more

Date: January 1, 1991

Creator: Kao, C. C.; Johnson, E. D.; Hastings, J. B.; Siddons, D. P. (Brookhaven National Lab., Upton, NY (United States)) & Vettier, C. (Institut Laue-Langevin, 38 - Grenoble (France))

Item Type: Article

Partner: UNT Libraries Government Documents Department