Patent ID: 11860530
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. A method, comprising:
providing, on a substrate stage, a workpiece comprising a substate and a photoresist layer disposed on the substrate;
reflecting radiation off a photolithography mask onto the photoresist layer to form an exposed pattern on the photoresist layer;
developing the exposed pattern in the photoresist layer to form a patterned photoresist layer; and
etching the substrate using patterned photoresist layer as an etch mask,
wherein the photolithography mask comprises:
a multi-layer mirror (MLM),
a capping layer over the MLM, and
an absorber layer disposed over the capping layer, wherein the absorber layer comprises a printing feature pattern in a main area, and a plurality of venting features in a venting area.