Abstract:
A semiconductor thin film and glass stratum laminate is formed by depositing a semiconductor thin film onto a temporary substrate having a carbon coating to which the film adheres. Processing of the semiconductor thin film for selected performance characteristics is accomplished while the film is affixed to the temporary substrate. The processed thin film is transferred and electrostatically bonded to the glass stratum by exposure to a thermal environment at or below the softening point of the glass stratum and by application of an electric potential across the thin film and glass. The bonded thin film and glass stratum laminate is separated from the temporary substrate.
Abstract:
Method of infusing or introducing material into a substrate using a gas cluster ion beam. The method includes maintaining a reduced-pressure environment around a substrate holder and holding a substrate securely within that reduced-pressure environment. A gas-cluster ion beam formed from a pressurized gas mixture including an inert gas and at least one other atomic or molecular specie is provided to the reduced-pressure environment and accelerated. In one embodiment, the method includes irradiating the accelerated gas-cluster ion beam onto one or more surface portions of the substrate to form an infused region or gas-cluster ion-impact region therein by introducing part or all of the atomic or molecular specie into the surface. In another embodiment, the method includes modifying at least one electrical property of the surface of the substrate by irradiating the accelerated gas-cluster ion beam onto one or more surface portions of the substrate.
Abstract:
Numerous studies suggest that the current popular designs of coronary stents are functionally equivalent and suffer a 16 to 22 percent rate of restenosis. Although the use of coronary stents is growing, the benefits of their use remain controversial in certain clinical situations or indications due to their potential complications. The application of gas cluster ion beam (GCIB) surface modification such as smoothing or cleaning appears to reduce these complications and lead to genuine cost savings and an improvement in patient quality of life. The present invention is directed to the use of GCIB surface modification to overcome prior problems of thrombosis and restenosis. The atomic level surface smoothing of stents utilizing GCIB substantially reduces undesirable surface micro-roughness in medical coronary stents.
Abstract:
A method of forming a polycrystalline film, such as a diamond, on a foreign substrate involves preparing the substrate before film deposition to define discrete nucleation sites. The substrate is prepared for film deposition by forming a pattern of irregularities in the surface thereof. The irregularities, typically craters, are arranged in a predetermined pattern which corresponds to that desired for the location of film crystals. The craters preferrably are of uniform, predetermined dimensions (in the sub-micron and micron size range) and are uniformly spaced apart by a predetermined distance. The craters may be formed by a number of techniques, including focused ion beam milling, laser vaporization, and chemical or plasma etching using a patterned photoresist. Once the substrate has been prepared the film may be deposited by a number of known techniques. Films prepared by this method are characterized by a regular surface pattern of crystals which may be arranged in virtually any desired pattern. Diamond film materials made by this technique may be used in many electrical, optical, thermal and other applications.
Abstract:
A pulsed beam generator produces a short duration pulsed beam for thermal processing of selected regions of metallic and dielectric materials. The pulse beam is directed towards the material and irradiates selected surface regions thereof. Energy deposited by the pulsed beam momentarily elevates the temperature of the selected regions for a variety of thermal processing effects. The characteristics of the pulsed beam are such that only those regions on or near the surface are subjected to this thermal processing.
Abstract:
A pulsed laser or flash lamp produces a short duration pulse of light for thermal processing of selected regions of a semiconductor device. The light pulse is directed towards the semiconductor device and irradiates selected surface regions of the device to be processed. Energy deposited by the light pulse momentarily elevates the temperature of the selected regions above threshold processing temperatures for rapid, effective annealing, sintering or other thermal processing. The characteristics of the light pulse are such that only those surface vicinity regions to be processed are elevated to a high temperature and the remaining mass of the semiconductor device is not subjected to unnecessary or undesirable high temperature exposure.