Method for making graded I-III-VI/sub 2/ semiconductors and solar cell obtained thereby
A solar cell is described having a conversion efficiency of at least about 10.4% AMO, comprising: (a) a substrate; (b) a base contact on the substrate; (c) a polycrystalline, thin film CuInSe/sub 2/ semiconductor deposited on the contact and including a near-contact region rich in selenium, a p-type bulk region, and a near-junction region defining a p-n type transient homojunction in the semiconductor; (d) a (Zn/sub 0.2/Cd/sub 0.8/)S thin film deposited atop the CuInse/sub 2/ semiconductor to define a heterojunction, the film including sufficient indium doping in the region away from the heterojunction to provide a sheet resistance of the film of between about 20-25 ohm/square; (e) aluminium grid metalization atop the (Zn/sub 0.2/Cd/sub 0.8/)S thin film, the metalization sufficiently thick to eliminate grid resistance losses; (f) a SiO/sub x/ antireflection coating atop the (Zn/sub 0.2/Cd/sub 0.8/)S thin film and metalization, the SiO/sub x/ having an optical index of refraction of about 1.73; and (g) a MgF/sub 2/ antireflection coating atop the SiO/sub x/.
- Assignee:
- Boeing Co., Seattle, WA
- Patent Number(s):
- US 4684761
- OSTI ID:
- 6149941
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER SELENIDES
CRYSTALS
DIRECT ENERGY CONVERTERS
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY EFFICIENCY
ENERGY LOSSES
EQUIPMENT
FABRICATION
FILMS
HETEROJUNCTIONS
HOMOJUNCTIONS
INDIUM COMPOUNDS
INDIUM SELENIDES
INORGANIC PHOSPHORS
JUNCTIONS
LOSSES
MATERIALS
P-N JUNCTIONS
P-TYPE CONDUCTORS
PHOSPHORS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
POLYCRYSTALS
POWER LOSSES
SELENIDES
SELENIUM
SELENIUM COMPOUNDS
SEMICONDUCTOR JUNCTIONS
SEMICONDUCTOR MATERIALS
SEMIMETALS
SOLAR CELLS
SOLAR EQUIPMENT
SUBSTRATES
SULFIDES
SULFUR COMPOUNDS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZINC SULFIDES