Preparation and properties of evaporated CdTe films compared with single-crystal CdTe. Progress report no. 6, February 1, 1982-April 30, 1982
Description
Films of n-type CdTe:In have been deposited by hot-wall vacuum evaporation (HWVE) on 7059 glass substrates, BaF/sub 2/ single crystal substrates, metal (Pt, Cr, Mo, Al) coated glass substrates, and single crystal p-type CdTe substrates. Films deposited on 7059 glass show typically a dark resistivity of 2 x 10/sup 5/ ohm-cm and a light resistivity of 3 x 10/sup 2/ ohm-cm. With increasing In source temperature, the resistivity decreases, but actually increases slightly again if the T/sub In/ is raised above 600/sup 0/C. Photoexcitation increases the electron density but does not affect the electron mobility. It appears that the grains … continued below
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50 pages
Creation Information
Bube, R H January 1, 1982.
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Solar Energy Research Institute
Publisher Info: Solar Energy Research Inst., Golden, CO (USA)Place of Publication: Golden, Colorado
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Stanford Univ., CA (USA). Dept. of Materials Science and Engineering
Place of Publication: United States
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Description
Films of n-type CdTe:In have been deposited by hot-wall vacuum evaporation (HWVE) on 7059 glass substrates, BaF/sub 2/ single crystal substrates, metal (Pt, Cr, Mo, Al) coated glass substrates, and single crystal p-type CdTe substrates. Films deposited on 7059 glass show typically a dark resistivity of 2 x 10/sup 5/ ohm-cm and a light resistivity of 3 x 10/sup 2/ ohm-cm. With increasing In source temperature, the resistivity decreases, but actually increases slightly again if the T/sub In/ is raised above 600/sup 0/C. Photoexcitation increases the electron density but does not affect the electron mobility. It appears that the grains are depleted in the dark. Films deposited on BaF/sup 2/ show dark resistivity of about 5 ohm-cm and light resistivity of about 2 ohm-cm, corresponding to electron densities of about 3 x 10/sup 16/ cm/sup -3/ and electron mobilities of about 30 cm/sup 2//V-sec. For doping levels abpove 10/sup 16/ cm/sup -3/ photoexcitation increases the mobility, but not the electron density; it appears that the grains are not depleted in the dark in this case. Cr coated 7059 glass makes an ohmic contact to n-type CdTe films. A Schottky diode formed with a 100A thick Au layer showed V/sub oc/ = 0.46 V, J/sub sc/ = 9 mA/cm/sup 2/ and a solar efficiency of about 2%. An n/p homojunction device was made by HWVE deposition of a 1.5 ..mu..m thick n-type CdTe layer on a p-type CdTe single crystal substrate. Values of V/sub oc/ = 0.73 V and J/sub sc/ = 0.24 mA/cm/sup 2/ were obtained. Grain boundary investigations showed the additive quality of two independent grain boundaries when measured in series, and tested the effects of passivation by Au, Cu, Li and H/sub 2/ in p-type CdTe grain boundaries, and In in n-type CdTe grain boundaries. Marked decreases in grain boundary resistance were observed after Li diffusion and H/sub 2/ diffusion in p-type CdTe.
Physical Description
50 pages
Notes
NTIS, PC A03/MF A01.
Subjects
Keywords
- Alkaline Earth Metal Compounds
- Aluminium
- Barium Compounds
- Barium Fluorides
- Cadmium Compounds
- Cadmium Telluride Solar Cells
- Cadmium Tellurides
- Carrier Density
- Carrier Mobility
- Cdte
- Chalcogenides
- Chromium
- Crystal Structure
- Crystals
- Current Density
- Direct Energy Converters
- Efficiency
- Electric Conductivity
- Electric Potential
- Electrical Properties
- Electrons
- Elementary Particles
- Elements
- Equipment
- Evaporated
- Evaporated 140501* -- Solar Energy Conversion-- Photovoltaic Conversion
- Evaporation
- Fermions
- Fluorides
- Fluorine Compounds
- Glass
- Grain Boundaries
- Halides
- Halogen Compounds
- Homojunctions
- Indium
- Junctions
- Leptons
- Metals
- Microstructure
- Mobility
- Molybdenum
- Monocrystals
- Passivation
- Performance
- Phase Transformations
- Photoelectric Cells
- Photovoltaic Cells
- Physical Properties
- Platinum
- Platinum Metals
- Quantum Efficiency
- Schottky Barrier Solar Cells
- Semiconductor Junctions
- Single-Crystal
- Solar
- Solar Cells
- Solar Equipment
- Tellurides
- Tellurium Compounds
- Temperature Effects
- Transition Elements Solar
- Vacuum Evaporation
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- Other: DE82017062
- Report No.: SERI/PR-9330-1-T6
- Grant Number: AC02-77CH00178
- Digital Object Identifier: https://doi.org/10.2172/5357460
- Office of Scientific & Technical Information Report Number: 5357460
- Archival Resource Key: ark:/67531/metadc1072405
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- January 1, 1982
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- Feb. 4, 2018, 10:51 a.m.
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Bube, R H. Preparation and properties of evaporated CdTe films compared with single-crystal CdTe. Progress report no. 6, February 1, 1982-April 30, 1982, report, January 1, 1982; Golden, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc1072405/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.