Vapour deposition

1. A method, comprising: generating a vapour of a material from a source of said material comprising a plurality of separate solid pieces of said material supported on a surface of a base in a configuration in which said plurality of solid pieces of said target material include a plurality of first solid pieces arranged at a common level and defining gaps therebetween, and one or more solid wires in locations underneath edge portions of a respective adjoining pair of said first solid pieces such that the first solid pieces and the one or more solid wires together cover the whole of said surface of said base; and depositing said material from said vapour onto a substrate; wherein the method comprises mounting said plurality of first solid pieces on the base, and then introducing said one or more solid wires into said locations by hammering said one or more solid wires through said gaps.

2. The method according to claim 1 , wherein the plurality of first solid species have a greater combined area than said one or more solid wires.

3. The method according to claim 1 , wherein said base defines one or more recesses, and said locations of the one or more solid wires are in said one or more recesses.

4. The method according to 1 , wherein said locations of said one or more solid wires are on a flat surface of said base without recesses for receiving said one or more solid wires.

5. The method according to claim 1 , wherein said material is a noble metal.

6. The method according to claim 5 , wherein said material is gold.

7. The method according to claim 5 , wherein said base comprises a copper plate.