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Method-of-entraining-dislocations-and-other-crystalline-defects-in-heated-film-contacting-patterned-region

Active hold-down for heat treating

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***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE***

Description:...

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Method of entraining dislocations and other crystalline defects in heated film contacting patterned region

Details

Inventors: Smith, Henry I.; Geis, Michael W.;
Assignee: Massachusetts Institute of Technology (Cambridge, MA)
Primary Examiner: Lacey; David
Assistant Examiner:
Attorney, Agent or Firm: Smith, Jr.; Arthur A., Hieken; Charles

A process for entraining dislocations and other crystalline defects in a thin film includes coating a substrate, such as a layer of thermally grown silicon dioxide on a silicon wafer with the thin film of polycrystalline or amorphous silicon in the thickness range 0.05-10.mu. deposited by chemical vapor deposition. An encapsulation layer that is a composite of 2 .mu.m thickness SiO.sub.2, 30 nm of Si.sub.3 N.sub.4 is deposited on the thin film. A pattern of stripes is created on this encapsulation layer made of materials, such as titanium, silicon, silicon dioxide and photoresist. A long and narrow molten zone is created in the film with its long axis oriented perpendicular to the lines and is moved with a movable strip-heater over in a direction parallel to the lines in the recrystallization process to establish the dislocation and other crystalline defects in the film entrained to follow the pattern of stripes at locations related to the stripes.

DETAILED DESCRIPTION What is claimed is: 1.
A method of entraining dislocations and other crystalline defects in a film on a substrate which method includes the steps of intentionally creating a predetermined pattern in a region embracing at least one of said film and said substrate to form a patterned region, and processing said film by passing a heated zone through said film in a predetermined direction to establish dislocations and other crystalline defects in said film entrained to follow said pattern and located at predetermined positions related to said pattern.
2.
A method in accordance with claim 1 wherein the step of creating said predetermined pattern comprises forming parallel lines.
3.
A method in accordance with claim 1 and further including the step of covering said film with an encapsulation layer and forming parallel lines in said encapsulation layer to form said patterned region.
4.
A method in accordance with claims 2 or 3 and further including the step of uniformly spacing said parallel lines.
5.
A method in accordance with claim 3 and further including the step of forming said parallel lines substantially parallel to said predetermined direction.
6.
A method in accordance with claim 1 and further including the step of establishing said pattern with material that reflects radiation.
7.
A method in accordance with claim 1 and further including the step of establishing said pattern with material that absorbs radiation.
8.
A method in accordance with claim 1 and further including the step of forming said pattern by establishing a relief structure.
9.
A method in accordance with claim 8 and further including the step of forming said relief structure in said substrate.
10.
A method in accordance with claim 8 and further including the step of covering said thin film with an encapsulating layer and forming said relief structure in said encapsulating layer.
11.
A method in accordance with claim 1 and further including the step of forming said pattern with material of a chemical composition that differs from that of the material of the surface in which the pattern is created

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