Production of single phase chalcopyrite CuInSe/sub 2/ by spray pyrolysis
Thin films (0.5--2 ..mu..) of CuInSe/sub 2/ were prepared by spray pyrolysis from solutions with various pH levels and initial Cu:In ratios, and in which the Cu source was either CuCl or CuCl/sub 2/. The substrate temperature was varied between 225 and 300 /sup 0/C. All films prepared with CuCl/sub 2/ were chalcopyrite, while only Cu-rich CuCl based films exhibited this phase. The appearance of Cu/sub 2-x/Se and/or Cu/sub 2//Se as a second phase was found to depend strongly on solution stoichiometry, pH, temperature, and substrate. Two layer structures consisting of a Cu-deficient layer on top of a Cu-rich layer were produced without the presence of any second phases on both glass and Mo-coated glass. This is the first time single phase chalcopyrite Cu-deficient layers have been fabricated by spray pyrolysis. A CuInSe/sub 2//CdS photovoltaic cell made from a single phase double layer filme on glass gave a V/sub oc/ of 0.558 V after heat treatment. This V/sub oc/ is higher than any reported to date. Absorption spectra have also been measured, and are found to improve when CuCl/sub 2/ is used instead of CuCl.
- Research Organization:
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
- OSTI ID:
- 6335487
- Journal Information:
- Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 45:8; ISSN APPLA
- Country of Publication:
- United States
- Language:
- English
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The effect of pH on the production of chalcopyrite CuInSe/sub 2/ prepared by spray pyrolysis
Related Subjects
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
ABSORPTION SPECTRA
CADMIUM SULFIDE SOLAR CELLS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COATINGS
COPPER CHLORIDES
COPPER COMPOUNDS
COPPER HALIDES
COPPER SELENIDES
DECOMPOSITION
DEPOSITION
DIRECT ENERGY CONVERTERS
ELEMENTS
EQUIPMENT
FABRICATION
GLASS
HALIDES
HALOGEN COMPOUNDS
HEAT TREATMENTS
HIGH TEMPERATURE
INDIUM COMPOUNDS
INDIUM SELENIDES
LAYERS
METALS
MOLYBDENUM
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PYROLYSIS
SELENIDES
SELENIUM COMPOUNDS
SOLAR CELLS
SOLAR EQUIPMENT
SPECTRA
SPRAY COATING
SPRAYED COATINGS
STOICHIOMETRY
SURFACE COATING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS