Caution: This may or may not be just one clue on a treasure hunt. The term shielding well (which would be a literal translation of Abschirmbrunnen) appears in several Googles, but seems to be connected to electronics and semiconductors. The question, of course is whether t your text is referring to (for example an) electronic gadget with an ecological application.

Example of use:The method as claimed in claim 1, comprising producing an electrically conductive decoupling region terminal region at the same time as the production of the terminal region leading to the region near the substrate.

5. The method as claimed in claim 4, wherein the decoupling region terminal region and the decoupling region form a *shielding well*which completely surrounds a region encompassed by the shielding well.

6. The method as claimed in claim 4, wherein, in the layer in which the region near the substrate and the decoupling region are arranged, the regions outside the region near the substrate and the decoupling region are provided with a doping of a different conduction type, an oxide covering the region near the substrate and the decoupling region serve for masking implantation.

7. The method as claimed in claim 1, wherein at least one of: the terminal region is produced with fabrication of a trench; the terminal region is fabricated with the aid of a diffusion process in which dopants diffuse from a region remote from the substrate as far as the layer near the substrate; or the terminal region is produced by an implantation method."