Metal Oxide Protective Layer for Halogen-Sensitive Semiconductor Devices
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Solution Overview
Problem
High-K dielectric materials in semiconductor devices are often incompatible with subsequent layers, leading to undesirable reactions and non-uniform film formation due to their sensitivity to halogen-containing chemicals, which can compromise device performance.
Innovation Solution
A metal oxide protective layer is formed on a halogen-sensitive metal-including layer using a non-halogenated metal oxide precursor, reacting with an oxygen-containing reactant to create a barrier that shields the underlying layer from halogen-including chemicals, thereby preventing undesirable interactions and promoting uniform film deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-K dielectric material is used as a gate dielectric to achieve desired equivalent oxide thickness with sufficient film thickness, then leakage is avoided, but incompatibility with subsequently deposited materials occurs leading to compromised device performance
Solution Approach 1:
A metal oxide protective layer is deposited between the halogen-sensitive high-K dielectric material and subsequently deposited materials. This protective layer acts as an intermediary barrier that prevents direct interaction between the high-K dielectric and halogen-containing chemicals, thereby eliminating incompatibility issues while maintaining the desired film thickness and leakage prevention properties of the high-K dielectric material
2Productivity
If halogen-containing chemicals are used in subsequent deposition processes, then film deposition can proceed, but halogen-induced reactions occur on the halogen-sensitive high-K dielectric surface leading to non-uniform film formation
Solution Approach 1:
The metal oxide protective layer serves as a mediator that allows halogen-containing chemicals to be used in subsequent deposition processes without causing halogen-induced reactions on the high-K dielectric surface. The protective layer is chemically resistant to halogens, enabling uniform film deposition while preventing the formation of non-uniform structures on the underlying high-K dielectric material
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The metal oxide protective layer enhances film uniformity and reduces defects, improving the overall performance and reliability of semiconductor devices by preventing halogen-induced reactions and ensuring continuous, uniform film growth.
Implementation Method 1
reacting an oxygen-containing reactant with the metal-including active species to form the metal oxide protective layer
Data Source
AI summary
Embodiments related to metal oxide protective layers formed on a surface of a halogen-sensitive metal-including layer present on a substrate processed in a semiconductor processing reactor are provided. In one example, a method for forming a metal oxide protective layer is provided. The example method includes forming a metal-including active species on the halogen-sensitive metal-including layer, the metal-including active species being derived from a non-halogenated metal oxide precursor. The example method also includes reacting an oxygen-containing reactant with the metal-including active species to form the metal oxide protective layer.