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Ferroelectric device film stacks with texturing layer, and method of forming such

專利號(hào)
US11659714B1
公開日期
2023-05-23
申請(qǐng)人
Kepler Computing Inc.(US CA San Francisco)
發(fā)明人
Niloy Mukherjee; Ramamoorthy Ramesh; Sasikanth Manipatruni; James Clarkson; FNU Atiquzzaman; Gabriel Antonio Paulius Velarde; Jason Y. Wu
IPC分類
H01L27/11507; H01L27/11502; H01L49/02; H01L27/11597; H01L27/11592; H01L27/11587
技術(shù)領(lǐng)域
templating,lattice,layer,or,angstroms,in,structure,constant,fe,some
地域: CA CA San Francisco

摘要

Described are ferroelectric device film stacks which include a templating or texturing layer or material deposited below a ferroelectric layer, to enable a crystal lattice of the subsequently deposited ferroelectric layer to template off this templating layer and provide a large degree of preferential orientation despite the lack of epitaxial substrates.

說明書

The drain contact 208b is coupled to via 209b, which is coupled to metal layer 110. Metal layer 210 is the bit-line, which extends along the x-axis. The source contact 208a is coupled to via 209b. Any suitable material can be used for drain and source contacts 208a/n and via 209a/b. For example, one or more of Ti, N, Si, Ta, Cu, Al, Au, W, or Co can be used for drain and source contacts 208a/n and via 209a/b. Via 209b is coupled to FE capacitor Cfe 211 that comprises a stack of layers including a templating layer deposited below a ferroelectric layer to enable crystal lattice of the subsequently deposited ferroelectric layer to template off this templating layer and provide a large degree of preferential orientation despite the lack of epitaxial substrates. In some embodiments, the stack of layers that forms a ferroelectric device or capacitor Cfe 211 comprises a bottom barrier layer, a templating layer on the bottom barrier layer, a bottom electrode on the templating layer, a ferroelectric layer on the bottom electrode, a top electrode on the ferroelectric layer, and a top barrier on the top electrode. In some embodiments, each layer may be a single layer. In some embodiments, some or all layers comprise a superlattice of two or more different materials. In some embodiments, the templating layer is self-crystalized. In some embodiments, the templating layer has an in-plane lattice constant. In some embodiments, the in-plane lattice constant is within about 5% of a lattice constant of the bottom electrode and the ferroelectric layer. In some embodiments, the top and/or bottom electrodes includes one or more of: Sr, Ru, O, La, Mn, or Ti.

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