Abstract:
Embodiments of the invention generally relate to nonvolatile memory devices, such as a ReRAM cells, and methods for manufacturing such memory devices, which includes optimized, atomic layer deposition (ALD) processes for forming metal oxide film stacks. The metal oxide film stacks contain a metal oxide coupling layer disposed on a metal oxide host layer, each layer having different grain structures/sizes. The interface disposed between the metal oxide layers facilitates oxygen vacancy movement. In many examples, the interface is a misaligned grain interface containing numerous grain boundaries extending parallel to the electrode interfaces, in contrast to the grains in the bulk film extending perpendicular to the electrode interfaces. As a result, oxygen vacancies are trapped and released during switching without significant loss of vacancies. Therefore, the metal oxide film stacks have improved switching performance and reliability during memory cell applications compared to traditional hafnium oxide based stacks of previous memory cells.
Abstract:
Provided are methods for depositing a cerium doped hafnium containing high-k dielectric film on a substrate. The reagents of specific methods include hafnium tetrachloride, an organometallic complex of cerium and water.
Abstract:
The present invention relates to a noble group IV-B organometallic compound represented by formula 1 below, and to a method for preparing same, and more particularly, to a group IV-B organometallic compound which is applicable to chemical vapor deposition (CVD) or atomic layer deposition (ALD), and which is thermally and chemically stable, and to a method for preparing same. The group IV-B organometallic compound synthesized according to the present invention is highly volatile and thermally stable, and can thus be advantageously used for the preparation of group IV-B metal oxide films. In formula 1, M is Ti, Zrf or Hf, R1 is an alkyl group of C1-C4, and R2 and R3 are, independently, C1-C6 alkyl groups.
Abstract:
Embodiments of a phase-stable amorphous high-? dielectric layer in a device and methods for forming the phase-stable amorphous high-? dielectric layer in a device are generally described herein. Other embodiments may be described and claimed.
Abstract:
Methods are provided for treating germanium surfaces (200) in preparation for subsequent deposition, particularly gate dielectric deposition by atomic layer deposition (ALD). Prior to depositing, the germanium surface (200) is treated with plasma products or thermally reacted with vapor reactants. Examples of surface treatments leave oxygen bridges, nitrogen bridges, -OH, -NH and/or -NH2 terminations that more readily adsorb ALD reactants. The surface treatments avoid deep penetration of the reactants into the germanium bulk but improve nucleation.
Abstract:
Methods are provided herein for treating substrate surfaces in preparation for subsequent nucleation-sensitive depositions (e.g., polysilicon or poly-SiGe) and adsorption-driven deposition (e.g. atomic layer deposition or ALD). Prior to depositing, the surface is treated (110, 125) with non-depositing plasma products. The treated surface more readily nucleates polysilicon and poly-SiGe (such as for a gate electrode (220)), or more readily adsorbs ALD reactants (such as for a gate dielectric (260)). The surface treatment provides surface moieties more readily susceptible to a subsequent deposition reaction, or more readily susceptible to further surface treatment prior to deposition. By changing the surface termination of the substrate with a low temperature radical treatment, subsequent deposition is advantageously facilitated without depositing a layer of any appreciable thickness and without significantly affecting the bulk properties of the underlying material. Preferably less than 10 ANGSTROM of the bulk material incorporates the excited species, which can include fluorine, chlorine and particularly nitrogen excited species.
Abstract:
A method of forming a dielectric film on a Si substrate comprises the steps of adsorbing a gaseous molecular compound of a metal element constituting a dielectric material on a Si substrate, and causing a decomposition of the gaseous molecular compound thus adsorbed by a hydrolysis process or pyrolytic decomposition process or an oxidation process.