Photoluminescent Properties of Vacuum Deposited Cadmium Sulfide Films PDF Download
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Author: William Paul Bleha (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 159
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Book Description
Green and blue photoluminescence has been observed below 100 degrees K in vacuum deposited, low resistivity CdS films given no post deposition treatment. The films were deposited in a heated chamber inside the bell jar on fused quartz substrates held at temperatures from 140-180 degrees C. The background pressure in the vacuum system was 0.000 001 Torr. The evaporant used was chlorine-doped CdS powder. The chlorine doping activated the luminescence and gave films that had resistivities at 300 degrees K in the range of from 1 to 100 ohm-cm parallel to the substrate. The green luminescence in the films at 77 degrees K was similar to the emission reported for donor-doped CdS. The green emission spectra observed at 10 degrees K became better resolved than at 77 degrees K, and the peak position shift with temperature was small. The blue emission peak observed in the films was at 4892 A at 77 degrees K, which is in the fundamental absorption edge. Some of the literature relating to the theory and practice of CdS vacuum deposition is reviewed. Also a summary of the properties of the green luminescence of pure and donor-doped CdS is given. (Author).
Author: William Paul Bleha (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 159
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Book Description
Green and blue photoluminescence has been observed below 100 degrees K in vacuum deposited, low resistivity CdS films given no post deposition treatment. The films were deposited in a heated chamber inside the bell jar on fused quartz substrates held at temperatures from 140-180 degrees C. The background pressure in the vacuum system was 0.000 001 Torr. The evaporant used was chlorine-doped CdS powder. The chlorine doping activated the luminescence and gave films that had resistivities at 300 degrees K in the range of from 1 to 100 ohm-cm parallel to the substrate. The green luminescence in the films at 77 degrees K was similar to the emission reported for donor-doped CdS. The green emission spectra observed at 10 degrees K became better resolved than at 77 degrees K, and the peak position shift with temperature was small. The blue emission peak observed in the films was at 4892 A at 77 degrees K, which is in the fundamental absorption edge. Some of the literature relating to the theory and practice of CdS vacuum deposition is reviewed. Also a summary of the properties of the green luminescence of pure and donor-doped CdS is given. (Author).
Author: G. G. AVIS
Publisher:
ISBN:
Category : Metallic films
Languages : en
Pages : 43
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Cadmium sulfides was vacuum-deposited onto glass substrates at approximately 0.00002 torr using electron beam heating. Initial resistivities were in the range 0.1 to 1 ohm-cm. After heating in vacuum at 360 to 370C for 1/2 hr, the resistivities increased to the range 0.3 to 300,000 ohm-cm. To correlate resistivity with crystal structure, the cadmium sulfide films were studied by means of X-ray and electron diffraction, and spectrophotometry. It was found that these cadmium sulfide films were hexagonal and highly oriented with the c-axis perpendicular to the plane of the substrate. Grain size perpendicular to the c-axis was much less than 100 A after deposition onto room-temperature substrates, and increased to 100 to 200 A in diameter after heat treatment. To determine the type of contact the commonly deposited metals make to cadmium sulfide, a mask changer was employed to allow the deposition of layerized arrays of metal-cadmium sulfide-metal in a single pumpdown. Aluminum, indium, silver, and gold were thereby deposited in several different electrode combinations. Combinations having aluminum as one (or both) of the electrodes exhibited rectifying characteristics; all other combinations exhibited ohmic characteristics. (Author).
Author: Kuang-Hang Frank Yu
Publisher:
ISBN:
Category : Thin films
Languages : en
Pages : 60
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Author: D. W. READEY
Publisher:
ISBN:
Category :
Languages : en
Pages : 421
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Cadmium sulfide thin films are of interest for various electronic device applications. Films deposited on cold substrates have high conductivities unsuitable for device utilization and must be heat-treated to improve their properties. This investigation was therefore concerned with the high conductivity and phenomena resulting from heat-treatment to elucidate the mechanism that gives rise to them. Based on kinetic measurements made during heat-treatment and other experiments, it is concluded that the high conductivity is caused by a nonstoichiometric excess of cadmium in the films. During heat-treatment, the excess cadmium diffuses to the film surface where it evaporates, with diffusion being the rate-controlling mechanism. Also, the as-deposited films contain a number of electron trapping sites, most of which are annealed out during heat treatment. (Author).
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Category : Aeronautics
Languages : en
Pages : 968
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Author: D. A. Contini
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ISBN:
Category : Thin film transistors
Languages : en
Pages : 38
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Author:
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ISBN:
Category : Photoelectric cells
Languages : en
Pages : 186
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Author: John A. Thornton
Publisher:
ISBN:
Category : Cadmium sulfide photoconductive cells
Languages : en
Pages : 86
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ISBN:
Category : Physics
Languages : en
Pages : 864
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Author:
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ISBN:
Category : Solar energy
Languages : en
Pages : 240
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