Lead salt thin films, devices, and methods of manufacture
AssigneeThe Board of Regents of the University of Oklahoma
InventorBinbin Weng
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Abstract
A method of manufacturing a lead salt thin film on a substrate by seeding a substrate with a lead salt solution (e.g., PbSe, PbS, or PbTe) to form a seeded substrate comprising lead salt seed crystals, and growing the lead salt thin film upon the substrate by exposing the seeded substrate to a chemical bath comprising the lead salt solution at a predetermined growth temperature. A lead salt thin film manufactured by the process. A photonic crystal microchip comprising the lead salt thin film. A gas sensing device comprising a diode laser, a mid-infrared photodetector, and the photonic crystal microchip. A method of detecting a hydrocarbon gas, comprising exposing a gas sample to the gas sensing device, and determining the content of hydrocarbon gases in the gas sample.
Claims17
A method of manufacturing comprising:
- seeding, using a physical vapor deposition (PVD) process, a substrate with a lead salt solution having a first potential of hydrogen (pH) of 10-12 at a seeding temperature of 560-90 degrees Celsius (C) for 1-5 minutes to form a seeded substrate comprising lead salt seed crystals;
- and
- growing a lead salt thin film upon the substrate by exposing the seeded substrate to a chemical bath comprising the lead salt solution at a growth temperature of 50-65° C. for 1-15 minutes at a second pH of 10-12.
Dependencies are inferred from the claim text.