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Alignment through topography on intermediate component for memory device patterning

專利號
US11177437B2
公開日期
2021-11-16
申請人
International Business Machines Corporation(US NY Armonk)
發(fā)明人
Hao Tang; Michael Rizzolo; Injo Ok; Theodorus E. Standaert
IPC分類
H01L45/00; H01L23/544; H01L27/24
技術(shù)領(lǐng)域
alignment,layer,dielectric,electrode,metal,assisting,mark,depositing,in,or
地域: NY NY Armonk

摘要

An intermediate semiconductor device structure includes a first area including a memory stack area and a second area including an alignment mark area. The intermediate structure includes a metal interconnect arranged on a substrate in the first area and a first electrode layer arranged on the metal interconnect in the first area, and in the second area. The intermediate structure includes an alignment assisting marker arranged in the second area. The intermediate structure includes a dielectric layer and a second electrode layer arranged on the alignment assisting marker in the second area and on the metal interconnect in the first area. The intermediate structure includes a hard mask layer arranged on the second electrode area. The hard mask layer provides a raised area of topography over the alignment assisting marker. The intermediate structure includes a resist arranged on the hard mask layer in the first area.

說明書

FIG. 3 depicts a cross-sectional side view of the semiconductor device 100 subsequent to depositing a first electrode 306 on the metal connector 208. The first electrode 306 is deposited on the entire substrate, including the first area 510 and the second area 520. In embodiments of the invention in which the metal connector is not included, the first electrode 306 is deposited directly on the metal interconnect 102 arranged in the dielectric layer 101. Non-limiting examples of materials for the first electrode 306 (also referred to as a bottom electrode) include metals, for example, platinum, copper, silver, gold, ruthenium, iridium, nickel, titanium, titanium nitride, tantalum, tantalum nitride, zirconium nitride, or a combination thereof. The thickness of the first electrode 306 is typically less than 40 nm, so that the underlying metal structures (metal interconnect 102 or metal connector 208) are readable in subsequent lithography exposure of the alignment assisting component/alignment mark (see FIG. 5).

權(quán)利要求

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