Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1987-11-09
1989-03-21
Dees, Jose G.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
430270, 430311, 430945, 427 531, B05D 306
Patent
active
048142590
ABSTRACT:
A conductive or semiconductive pattern of a metal sulfide or selenide such as copper, cadmium, cobalt or nickel sulfide, is provided on a substrate. The pattern may have a resistivity in the range of 1 to 10.sup.6 ohms per square. It is formed by coating the surface with a solution containing a salt of one of the metals which is capable of being converted to a divalent metal compound, a sulfur group donor such as thiourea, and a solvent such as methanol or water. The solution is dried, and then selected portions of the coated surface are irradiated with a laser beam. This thermally converts the irradiated metal salt into a metal sulfide. The unreacted solution is then washed from the substrate to leave a conductive pattern. The desired conductivity of the pattern can be obtained by selecting the proper metal salt, concentration of salt in the solution, and the energy of the radiation.
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Cunningham Patricia H.
Newman Paul R.
Warren, Jr. Leslie F.
Dees Jos,e G.
Hamann H. Fredrick
Loney Donald J.
Malin Craig O.
Rockwell International Corporation
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