Patent ID: 11937379
Assignee: AT&S AUSTRIA TECHNOLOGIE & SYSTEMTECHNIK AKTIENGESELLSCHAFT
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method of etching an electrically conductive layer structure during manufacturing a component carrier, the method comprising:
subjecting the electrically conductive layer structure to an etching composition comprising an etchant and a photosensitive compound to thereby form a recess in the electrically conductive layer structure; and
irradiating the recess at least for a part of time while the electrically conductive layer structure is subjected to the etching composition;
wherein the photosensitive compound has at least one functional group configured for inhibiting copper etching,
wherein the photosensitive compound comprises an ionic liquid comprising organic cations and at least one of organic anions or inorganic anions and having a melting point of less than 100° C.