Method for operating a vacuum Coating apparatus

1 . A method for operating a vacuum coating apparatus, for producing thin-film solar cells, the method comprising:

performing a layer deposition task, after a coating chamber cleaning task using a cleaning gas and before a product production task, to apply a diffusion barrier layer onto the walls of the coating chamber.

2 . The method of claim 1 , wherein a gas containing fluorine is used as cleaning gas in the coating chamber cleaning task.

3 . The method of claim 1 , wherein a diffusion barrier layer having at least one of a silicon, silicon oxide, silicon carbide, and silicon nitride is applied in the layer deposition task.

4 . The method of claim 3 , wherein one of an amorphous silicon, a microcrystalline silicon, and a silicon having a transition phase is applied in the layer deposition task.

5 . The method of claim 3 , wherein a layer having amorphous silicon carbide is applied in the layer deposition step.

6 . The method of claim 1 , wherein the layer thickness of the diffusion barrier layer is set as a function of the layer material and of a deposition temperature so that, during the intended operation of the vacuum coating apparatus, the diffusion barrier layer stably adheres completely to the walls of the coating chamber.

7 . The method of claim 6 , wherein the layer thickness of the diffusion barrier layer is set to a value in the range between 5 nm and 500 nm.

8 . The method of claim 1 , wherein the product production task following the layer deposition task includes a deposition of one of an n-doped Si layer, a p-doped Si layer, and an intrinsic Si layer of a thin-film solar cell.

9 . The method of claim 6 , wherein the layer thickness of the diffusion barrier layer is set to a value in the range between 50 nm and 300 nm.