Point source assembly for thin film deposition devices and thin film deposition devices employing the same
A point source assembly for a thin film deposition device having a chamber for holding a substrate, includes a crucible configured for holding and vaporizing a deposition material therein, where the crucible is configured for operative engagement to the chamber, an opening in the crucible configured for directing therefrom a vaporized form of the deposition material, where the opening includes a longitudinal line extending through the center of the crucible opening, and means operatively engaged to the crucible for facilitating rotational movement of the crucible for varying the orientation of the longitudinal line relative to the position of the substrate in the chamber.
1. A point source assembly for a thin film deposition device having a chamber for holding a substrate for receiving a vaporizable material and an opening therein having a first longitudinal axis through which a vaporized deposition material passes therethrough, comprising:
a crucible configured for holding and vaporizing a deposition material therein, the crucible being configured for operative engagement to the chamber, said crucible having an opening therein configured for directing therefrom a vaporized form of the deposition material through the opening of the chamber, said crucible having a second longitudinal axis; and
means for moving the crucible to vary the orientation of the first and second longitudinal axis with respect to each other during the time when the vaporized material is directed toward the substrate; a flange having a fixed upper portion and a rotatable lower portion, said fixed upper portion of the flange configured for attachment to the chamber;
said flange extending around the crucible and attached to the lower portion of the flange; and
said lower portion being configured for facilitating rotational movement of the crucible about an axis of rotation coextensive with the first longitudinal axis.
2. The point source assembly of claim 1 further comprising a deformable member disposed between the crucible and the chamber for permitting selective adjustment of the orientation of the opening.
3. The point source assembly of claim 2 wherein the deformable member comprises a tubular bellows extending around the crucible.
4. The point source assembly of claim 1 further comprising means operatively engaged to the crucible for facilitating movement of the crucible.
5. The point source assembly of claim 4 wherein the movement is rotational movement.
6. The point source assembly of claim 5 wherein the rotational speed is at least 0.1 rpm.
7. The point source assembly of claim 6 wherein the rotational speed is in the range of from about 0.5 rpm to 100 rpm.
8. The point source assembly of claim 4 wherein the second longitudinal axis is oriented offset from the first longitudinal axis at an angle (α).
9. The point source assembly of claim 8 wherein the angle (α) is less than 90°.
10. The point source assembly of claim 9 wherein the angle (α) is in the range of from about 1° to 30°.
11. The point source assembly of claim 1 further comprising a deformable member disposed between the lower portion of the flange and the crucible for facilitating selective adjustment of the orientation of the opening.
12. The point source assembly of claim 11 wherein the deformable member comprises a tubular bellows extending around the crucible.
13. A thin film deposition device comprising a housing, and the point source assembly of claim 1 operatively associated with said housing.