摘要:
A method of code programming a mask read only memory (ROM) is disclosed. A method of the present invention includes forming a layer of developable anti-reflective coating over a plurality of code openings located on a substrate of a ROM device. The plurality of code openings are typically elements of a first code, or pre-code, pattern, and a portion of the developable anti-reflective coating layer is removed or processed to define a second code, or real-code, pattern of the device. The method may be practiced by applying and patterning a layer of photoresist material over the developable anti-reflective coating to form a second code pattern, and then removing portions of the developable anti-reflective coating that remain exposed beneath the patterned photoresist material.
摘要:
The present invention provides a method of using organic polymer as a covering layer for a device lightly doped drain (LDD) structure, wherein a photo resist is covered by organic polymer, and ion implantation of different energies and kinds are performed to the same region of different line widths, thereby achieving the effect of LDD. Additionally, the covering layer of organic polymer is removed by means of simple and easy oxygen plasma etch so as not to increase the complexity of fabrication process. The complex fabrication process of a device LDD structure in the prior art is thus greatly improved.