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578results about "From gel state" patented technology

Line scan sequential lateral solidification of thin films

A polycrystalline film is prepared by (a) providing a substrate having a thin film disposed thereon, said film capable of laser-induced melting, (b) generating a sequence of laser pulses having a fluence that is sufficient to melt the film throughout its thickness in an irradiated region, each pulse forming a line beam having a predetermined length and width, said width sufficient to prevent nucleation of solids in a portion of the thin film that is irradiated by the laser pulse, (c) irradiating a first region of the film with a first laser pulse to form a first molten zone, said first molten zone demonstrating a variation in width along its length to thereby define a maximum width (Wmax) and a minimum width (Wmin), wherein the first molten zone crystallizes upon cooling to form one or more laterally grown crystals, (d) laterally moving the film in the direction of lateral growth a distance that is greater than about one-half Wmax and less than Wmin; and (e) irradiating a second region of the film with a second laser pulse to form a second molten zone having a shape that is substantially the same as the shape of the first molten zone, wherein the second molten zone crystallizes upon cooling to form one or more laterally grown crystals that are elongations of the one or more crystals in the first region.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK

Systems and methods for inducing crystallization of thin films using multiple optical paths

The present invention is directed to systems and methods for irradiating regions of a thin film sample(s) with laser beam pulses having different energy beam characteristics that are generated and delivered via different optical paths. Exemplary methods include the steps of generating a plurality of laser beam pulses having energy beam characteristics, directing a generated laser beam pulse onto a first optical path, modulating the energy beam characteristics of the first optical path-directed laser beam pulse, irradiating at least a portion of a first region of the thin film with the first optical path-directed laser beam pulse to induce crystallization of the portion of the first region, directing a generated laser beam pulse onto a second optical path, modulating the energy beam characteristics of the second optical path-directed laser beam pulse, wherein the energy beam characteristics of the second optical path-directed laser beam pulse is different from the energy beam characteristics of the first optical path-directed laser beam pulse, and irradiating at least a portion of a second region of the thin film with the second optical path-directed laser beam pulse to induce crystallization of the portion of the second region. An exemplary system includes a first optical path, a second optical path, a beam steering element for directing laser beam pulses onto the first optical path and the second optical path; and a handling stage for controlling the position of a thin film relative to the laser beam pulses being directed via the first and second optical paths.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
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