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in subjects: "Phosphors"

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Cadmium sulfide/copper sulfide heterojunction cell research. Final report, February 26, 1979-July 15, 1980

Extensive modifications were made to the multi-source deposition apparatus. These include the installation of a larger vacuum chamber on the existing system. The new chamber provides improved inter-source shielding, an improved substrate mounting and heating system, and a vacuum interlock for introducing substrates. CdS resistivity control by both In doping and off-stoichiometric deposition has been investigated. Indium doping has been achieved both by diffusion from a pre-deposited In layer an… more

Date: June 30, 1980

Creator: Thornton, J. A. & Cornog, D. G.

Item Type: Report

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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Avalanche transistor pulser for fast-gated operation of micro-channel plate image-intensifiers

Transistors operated in the avalanche mode are employed to generate a 1000 volt 10 to 30 nsec wide pulse with less than 4 nsec rise and fall times. This pulse is resistively attenuated to approximately equal to 270 volts and drives the image intensifier tube which is a load of approximately equal to 200 pf. To reduce stray inductance and capacitance, transistor chips were assembled on a thick-film hybrid substrate. Circuit parameters, operating conditions, and coupling to the microchannel plate… more

Date: January 1, 1977

Creator: Lundy, A.; Parker, J. R.; Lunsford, J. S. & Martin, A. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Radiation protection: an analysis of thyroid blocking. [Effectiveness of KI in reducing radioactive uptake following potential reactor accident]

An analysis was performed to provide guidance to policymakers concerning the effectiveness of potassium iodide (KI) as a thyroid blocking agent in potential reactor accident situations, the distance to which (or area within which) it should be distributed, and its relative effectiveness compared to other available protective measures. The analysis was performed using the Reactor Safety Study (WASH-1400) consequence model. Four categories of accidents were addressed: gap activity release acciden… more

Date: January 1, 1980

Creator: Aldrich, D.C. & Blond, R.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Liquid scintillators for optical-fiber applications

A multicomponent liquid scintillator solution for use as a radiation-to-light converter in conjunction with a fiber optic transmission system. The scintillator includes a quantity of 1, 2, 4, 5, 3H, 6H, 1 OH, tetrahydro-8-trifluoromethyl (1) benzopyrano (9, 9a, 1-gh) quinolizin-10-one (Coumarin) as a solute in a fluor solvent such as benzyl alcohol or pseudo-cumene. The use of BIBUQ as an additional or primary solute is also disclosed.

Date: June 1, 1981

Creator: Franks, L. A. & Lutz, S. S.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

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Time-Resolved Doubly Bent Crystal X-Ray Spectrometer

X-ray spectroscopy is an essential tool in high temperature plasma research. We describe a time-resolved x-ray spectrometer suitable for measuring spectra in harsh environments common to many very high energy density laboratory plasma sources. The spectrometer consisted of a doubly curved Si(111) crystal diffraction element, a WL-1201 (ZnO:Ga) phosphor, a coherent fiber optic array, and two visible streak cameras. The spectrometer design described here has a minimum time resolution of 1.3 ns wi… more

Date: January 1, 1988

Creator: Hockaday, M. P.; Wilke, M. D.; Blake, R. L.; Vaninetti, J.; Gray, N. T. & Nedrow, P. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Heat-Flux Gage thermophosphor system

This document describes the installation, hardware requirements, and application of the Heat-Flux Gage (Version 1.0) software package developed by the Oak Ridge National Laboratory, Applied Technology Division. The developed software is a single component of a thermographic phosphor-based temperature and heat-flux measurement system. The heat-flux transducer was developed by EG G Energy Measurements Systems and consists of a 1- by 1-in. polymethylpentene sheet coated on the front and back with … more

Date: August 1, 1991

Creator: Tobin, K.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Development and testing of a Monte Carlo code system for analysis of ionization chamber responses

To predict the perturbation of interactions between radiation and material by the presence of a detector, a differential Monte Carlo computer code system entitled MICAP was developed and tested. This code system determines the neutron, photon, and total response of an ionization chamber to mixed field radiation environments. To demonstrate the ability of MICAP in calculating an ionization chamber response function, a comparison was made to 05S, an established Monte Carlo code extensively used t… more

Date: January 1, 1986

Creator: Johnson, J.O. & Gabriel, T.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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New liquid scintillators for fiber-optic applications

New long-wavelength-emitting, high-speed, liquid scintillators have been developed and tailored specifically for plasma diagnostic experiments employing fiber optics. These scintillators offer significant advantages over commercially available plastic scintillators in terms of sensitivity and bandwidth. FWHM response times as fast as 350 ps have been measured. Emission spectra, time response data, and relative sensitivity information are presented.

Date: January 1, 1981

Creator: Lutz, S. S.; Franks, L. A.; Flournoy, J. M. & Lyons, P. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Comparison of cesium iodide and gold photocathodes for x-ray streak cameras

X-ray streak cameras at Lawrence Livermore Laboratory use gold transmission photocathodes for x-ray detection. Other photocathode materials which might provide improved sensitivity without loss of temporal resolution are of interest. Of particular interest are dielectrics such as cesium iodide. Simultaneous measurements of the sensitivity to 500 eV x-rays of both gold and cesium iodide photocathodes in the LLL Soft X-ray Streak Camera were made. Enhanced sensitivity with the Csl photocathodes i… more

Date: January 1, 1979

Creator: Stradling, G.L.; Medecki, H.; Attwood, D.T.; Kauffman, R.L. & Henke, B.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Cadmium sulfide/copper sulfide heterojunction cell research. Technical progress report, September 1-November 30, 1979

Several all sputter deposited Cu/sub 2/S/CdS cells have been prepared to date with J/sub SC/ approx. = 3 mA/cm/sup 2/ under simulated AM1 illumination. The best AM1 conversion efficiency obtained is 0.6%. This is shown to be typical of sputtered CdS in Cu/sub 2/S/CdS cells investigated to date. The sputtered Cu/sub 2/S appears to be satisfactory for solar cell applications. Presented evidence indicates that the poor conversion efficiency is due to a low-junction electric field intensity on the … more

Date: February 1, 1980

Creator: Anderson, W. W. & Jonath, A. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Development of copper sulfide/cadmium sulfide thin film solar cells. First technical progress report, 13 July 1979 to 12 October 1979

Preparation of CdS films by evaporation from a single graphite source, as generally used by the Institute of Energy Conversion (IEC) group at the University of Delaware, has been implemented. Previously at Westinghouse, four evaporation sources were used to permit uniform coverage of large area substrates. The graphite source used in this period is somewhat smaller than the IEC design to permit accommodation to the heater geometry currently available. Initial efforts with the single source evap… more

Date: February 14, 1980

Creator: Szedon, J. R.; Shirland, F. A.; Stoll, J. A. & Dickey, H. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Shuttering Efficiencies of Nanosecond-Gated Photoemissive Shutter Tubes

Recent studies show that effective shuttering of photoemissive tubes, such as Silicon-Intensified-Target Vidicons (SITVs) and Microchannel-plate Image Intensifier Tubes (MCPTs), can vary widely depending upon the extent of their opacity to an input flux of photons. Optical feedthrough signals from photon transmission through the photocathode to the target or phosphor ranging from 10/sup -4/ to 10/sup -9/ (when compared with gated signals) were measured for a large sampling of commercially avail… more

Date: January 1, 1985

Creator: Yates, George J.; Jaramillo, Steven A.; Pagano, Thomas S. & Black, J.Paul

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Cadmium sulfide/copper sulfide heterojunction cell research. Quarterly technical progress report, June 1-September 30, 1979

Off-stoiciometry CdS coatings with resistivities of about 10..cap omega..-cm have been deposited by a cyclic reactive sputtering process where the H/sub 2/S injection is periodically switched on and off. Cells with CdS layer fabricated in this way have yielded efficiencies of about 0.6% with short circuit currents of about 3.5 mA/cm/sup 2/, open circuit voltages of about 0.43V, and fill factors of about 0.40. CdS resistivity control by In doping has been achieved both by diffusion from a pre-de… more

Date: November 30, 1979

Creator: Thornton, J.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Commercializatzon of thick film solar cells. Quarterly progress report, September 21, 1979-December 31, 1979

Starting materials for the preparation of thick film cadmium sulfide and cadmium telluride solar cells have been comminuted. Initial trial films of cadmium sulfide showed that during the next phase of this work, the printing of films, one of the major problem areas will be to obtain sufficient reflow in the printed films to remove the screen-caused variation in film thickness. The thin areas corresponding to the screen pattern caused pinholes to form in the fired parts.

Date: January 1, 1979

Creator: McDonald, G.D. & Goodman, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Thin films of InP for photovoltaic energy conversion. First quarterly technical progress report, July 5, 1979-September 28, 1979

A research study is in progress to develop a low-cost high-efficiency thin-film InP heterojunction solar cell, using the metalorganic chemical vapor deposition (MO-CVD) technique for InP film growth on suitable low-cost substrates. Heterostructure devices of CdS/InP and indium tin oxides (ITO)/InP are to be prepared by Stanford University under subcontract, using the InP films grown by MO-CVD. The first quarter's work is summarized. An existing reactor system was modified and upgraded, with pro… more

Date: November 1, 1979

Creator: Manasevit, H. M.; Ruth, R. P.; Moudy, L. A.; Yang, J. J. J. & Johnson, R. E.

Item Type: 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

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: Report

Partner: UNT Libraries Government Documents Department

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Readout techniques and radiation damage of undoped cesium iodide

Several readout techniques for undoped CsI have been studied which utilize the fast scintillation component for speed, and the high photon yield for good energy resolution. Quantum yields have been measured for samples up to 30 cm in length using photomultiplier tubes, wavelength shifters, and silicon photodiodes. A study has also been made of the scintillation properties of undoped CsI. It is found that the light output and decay time of the 310 nm fast component increases and the emission spe… more

Date: January 1, 1989

Creator: Woody, C.L.; Levy, P.W.; Kierstead, J.A.; Skwarnicki, T.; Sobolewski, Z.; Goldberg, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Research on polycrystalline thin film submodules based on CuInSe sub 2 materials

This report describes progress during the first year of a three-year research program to develop 12%-efficient CuInSe{sub 2} (CIS) submodules with area greater than 900 cm{sup 2}. To meet this objective, the program was divided into five tasks: (1) windows, contacts, substrates; (2) absorber material; (3) device structure; (4) submodule design and encapsulation; and (5) process optimization. In the first year of the program, work was concentrated on the first three tasks with an objective to de… more

Date: May 1, 1992

Creator: Catalano, A.; Arya, R.; Carr, L.; Fieselmann, B.; Lommasson, T.; Podlesny, R. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Photoelectronic properties of zinc phosphide crystals, films and heterojunctions. Quarterly progress report No. 2, July 1-September 30, 1979

The closed tube horizontal growth method has been pursued for the growth of single crystals of Zn/sub 3/P/sub 2/. The rate of material transport was increased by increasing the temperature difference between source and growth regions and by decreasing the distance involved. A boule with only 2 grains in a 12 mm diameter has been obtained. The as-grown resistivity of this single crystal Zn/sub 3/P/sub 2/ was 50 ohm-cm, which was reduced to 10 ohm-cm by subsequent annealing in hydrogen at 410/sup… more

Date: October 1, 1979

Creator: Bube, R.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Development of ferromagnetic spinels for optical isolation at 10. 6. mu. m. Progress report, May 1, 1977--July 31, 1977

An analysis of factors which influence the optical transparency of hot-pressed CdCr/sub 2/S/sub 4/ at 10.6 ..mu..m was made. It was found that multiphonon absorption, an intrinsic process, is the factor which limits the ultimate achievable absorption coefficient, ..cap alpha.., at 10.6 ..mu..m. Several extrinsic processes have also been found to affect the transmission of hot-pressed CdCr/sub 2/S/sub 4/. In sufficient concentration, oxygen appearing as SO/sub 4//sup 2 -/ or similar sulfate comp… more

Date: July 1, 1977

Creator: Teegarden, K.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Indium phosphide/cadmium sulfide thin-film solar cells. Quarterly technical progress report No. 1, June 1979-August 1979

Cadmium sulfide and InP thin films were prepared by thermal evaporation and planar reactive deposition, respectively. Polycrystalline CdS films up to 10 ..mu..m thick showed absorption losses of less than 10% over the 0.6- to 1.0-..mu..m wavelength range. A threefold increase in lateral grain size was achieved when CdS/ITO/GLASS structures were partially recrystallized in flowing H/sub 2/S/Ar at 550/sup 0/C. InP deposited onto (100) InP semiinsulating substrate at substrate temperatures as low … more

Date: November 1, 1979

Creator: Zanio, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Overview of thick-film technology as applied to solar cells

Thick-film technology was developed by the electronics industry as a means of fabricating components and miniature circuitry. Today, the solar cell industry is looking at screen printing as an alternate to more expensive, high-vacuum techniques in several of the production steps during the manufacture of silicon solar cells. Screen printing is already fairly well established as a means of providing electrical contact to a cell and for the formation of a back surface field. Now under investigati… more

Date: January 1, 1980

Creator: Firor, K. & Hogan, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Quantitative Comparison of Different Microchannel Plate Image Intensifier Tubes as Nanosecond Light Shutters in Coupled Video Systems

A comparison of different manufacturers' microchannel plate image intensifier tubes (MCPTs) in coupled bideo systems is presented. Comparative performances in the areas of optical gating speed, resolution, gain, and phosphor efficiency are discussed. Relative sensitivities for various combinations of coupled MCPT/TV imager systems including P-20 and P-20R phosphors cascaded to FPS (focus projection and scan) electrostatic vidicons with silicon or Sb/sub 2/S/sub 3/ targets and CID (charge inject… more

Date: January 1, 1986

Creator: Jaramillo, Steven A. & Yates, George J.

Item Type: Article

Partner: UNT Libraries Government Documents Department