Method of fabricating a phase shift mask utilizing a defect repair machine
AssigneeUnited Microelectronics Corp.
InventorChien-Chao Huang
Life of this patent
Estimating the term…
Abstract
A method of fabricating a single layer phase shift mask is provided. The method is characterized by depositing an opaque layer by using a defect repair machine on a given place of the phase shift layer formed by a conventional method. The opaque layer is formed on the alignment mark. The single layer phase shift mask of the invention can provide better resolution for transferred patterns projected on the wafer and can avoid registration deviation and reduce a problem of misalignment of the alignment mark efficiently by decreasing the transmittance of the alignment mark, such as a reticule mark or a stepper mark.
Claims17
A method of fabricating a phase shift mask, comprising the steps of:
- providing a transparent substrate;
- forming a phase shift layer on the transparent substrate;
- patterning the phase shift layer, the phase shift layer having at least one of a reticle mark and a stepper mark for alignment;
- and
- forming an opaque layer in a single step by using a defect repair machine, the opaque layer including one of carbon and gallium and being formed on the one of the reticle mark and the stepper mark in the phase shift layer.
A method of fabricating a phase shift mask, comprising the steps of:
- providing a quartz substrate;
- depositing a chrome oxide layer on the quartz substrate;
- patterning the chrome oxide layer, the chrome oxide layer having at least one of a reticle mark and a stepper mark for alignment;
- and
- forming an opaque layer in a single step by using a defect repair machine, the opaque layer including one of carbon and gallium and being formed on the one of the reticle mark and the stepper mark in the phase shift layer.
A method of fabricating a phase shift mask comprising the steps of:
- providing a transparent substrate;
- forming a phase shift layer on the transparent substrate;
- patterning the phase shift layer, the phase shift layer having at least one of a reticle mark and a stepper mark for alignment;
- and
- forming an opaque carbon layer in a single step by using a defect repair machine, the opaque carbon layer being formed on the one of the reticle mark and the stepper mark in the phase shift layer.
A method of fabricating a phase shift mask comprising the steps of:
- providing a transparent substrate;
- forming a phase shift layer on the transparent substrate;
- patterning the phase shift layer, the phase shift layer having at lest one of a reticle mark and a stepper mark for alignment;
- and
- forming an opaque gallium layer in a single step by using a defect repair machine, the opaque gallium layer being formed on the one of the reticle mark and the stepper mark in the phase shift layer.
Dependencies are inferred from the claim text.