Method and apparatus for photodeposition of films on surfaces
US4868005A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Mar 10, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to visible-laser deposition reactions of metal containing oxyhalide and carbonyl vapors, such as, chromyl chloride vapor, CrO.sub.2 Cl.sub.2, or cobalt carbonyl, Co.sub.2 (CO).sub.8, for direct writing of metal containing opaque patterns on various substrates (Si, SiO.sub.2, GaAs and glass). Deposition at low laser power is by photolysis of adsorbed reactant molecules. Higher powers initiate deposition photochemically and continue it with a combined photolytic/pyrolytic reaction, simultaneously inducing a solid-phase conversion of the deposited film. Mixed Cr.sub.2 O.sub.3 /CrO.sub.2 or cobalt thin films of 1-nanometer to several-micrometer thickness, as well as 1-millimeter-long single crystals of Cr.sub.2 O.sub.3 or cobalt, can be grown with this process, the former at rates up to 3 .mu.m/s. Thin chromium oxide films produced in this manner are strongly ferromagnetic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.