Patent ID: 7648611
Filing Date: 2010-01-19
Classification: H01J,H01L

Abstract:
1. A plasma etching system for etching a substrate by an action of a plasma, comprising: a first gas feed; a first plasma-generating device having a first arrangement to generate a first high-frequency electromagnetic alternating field, and a first plasma-generating area to generate a first plasma from reactive particles using the first high-frequency electromagnetic alternating field to act upon a first reactive gas, the substrate being arranged in the first plasma-generating device; a second gas feed; a second plasma-generating device arranged upstream from the first plasma-generating device having a second arrangement to generate a second high-frequency electromagnetic alternating field, and a second plasma-generating area to generate a second plasma from reactive particles using the second high-frequency electromagnetic alternating field to act upon a second reactive gas, the second plasma being suppliable to the first plasma-generating device via the first gas feed at least partially as the first reactive gas; a second ICP inductor having a first tap, a second tap, a first inductor end and a second inductor end; and a first ICP inductor electrically connected in parallel to only a subsection of the second ICP inductor via the first tap and the second tap; wherein the first plasma-generating device and the second plasma-generating device have a common high-frequency component having a common high-frequency generator and a common interface network; wherein the second ICP inductor has a grounded center tap, the first tap and the second tap being symmetrically positioned thereto; wherein the first tap is situated on the second ICP inductor between the center tap and the first inductor end, and the second tap is situated on the second ICP inductor between the center tap and the second inductor end.