Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1992-06-22
1994-08-16
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041293, 20412975, 156626, 156662, 356318, C25F 312, H01L 21306, B44C 122, G01J 330
Patent
active
053384156
ABSTRACT:
An n-type silicon (Si) wafer is galvanostatically etched in a hydrofluoric acid (HF)-containing solution while being illuminated with a 300 watt tungsten light source to form porous silicon with luminescent properties. Photoluminescence of the porous silicon is monitored using a short wavelength visible or ultraviolet light source and a monochromator/CCD detector assembly. Upon exposure to organic solvents, the photoluminescence is quenched. Within seconds of removal of the solvent, the original intensity is recovered and further exposure of the porous silicon to organic solvents will again result in quenching of the luminescence.
REFERENCES:
patent: 3962052 (1976-06-01), Abbas et al.
patent: 4377436 (1983-03-01), Donnelly et al.
patent: 4874484 (1989-10-01), Foell et al.
patent: 5026159 (1991-06-01), Allen et al.
patent: 5139624 (1992-08-01), Searson et al.
Reversible Luminescence Quenching of Porous Si By Solvents; Jeffrey M. Lauerhaas, et al.; Journal of the American Chemical Society, 1991; pp. 1911-1912.
Silicon Quantum Wire Array Fabrication by Electrochemical and Chemical Dissolution of Wafers; L. T. Canham; Appl. Phys. Lett. 57 (10); Sep. 3, 1990; pp. 1046-1048.
Shine On, Holey Silicon; Ivan Amato; Science, vol. 252; pp. 922-923.
Porous Silicon Formation: A Quantum Wire Effect; V. Lehmann, et al; Appl. Phys. Lett. 58 (8); Feb. 25, 1991; pp. 856-858.
Credo Grace
Heinrich Julie
Lauerhaas Jeffery M.
Sailor Michael J.
The Regents of the University of California
Valentine Donald R.
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