Capping Oxide Layer for Semiconductor Electrode Etching
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Solution Overview
Problem
As integration density increases in semiconductor devices, their reliability is deteriorated, and existing manufacturing methods fail to effectively address this issue.
Innovation Solution
A method involving the formation of a capping oxide layer through selective oxidation on semiconductor devices, where the etch rate of the capping oxide layer is less than that of the material layer, allowing for precise etching and improved reliability by using anisotropic oxidation processes and isotropic etching techniques to form electrodes and data storage layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integration density is increased in semiconductor devices, then device functionality and capacity are improved, but reliability is deteriorated
Solution Approach 1:
A capping oxide layer is introduced as an intermediary protective layer between the upper electrode and the etching environment. This layer has selective etch resistance, allowing it to protect the underlying material layer during isotropic etching processes while enabling precise formation of the upper electrode pattern. The capping oxide layer acts as a mediator that reconciles the need for high integration density with maintained reliability by providing differential protection during manufacturing.
2Manufacturing precision
If selective oxidation is performed to form a capping oxide layer, then etching precision is improved, but process complexity is increased
Solution Approach 1:
The invention utilizes parameter changes in the oxidation process to achieve selective formation of the capping oxide layer. By controlling oxidation conditions (such as temperature, time, and atmosphere), the process selectively oxidizes specific material layers while leaving others unaffected. This parameter-based selectivity enables precise etching boundaries without requiring complex mask patterns or multiple etching steps, thus improving manufacturing precision while managing process complexity.
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
This approach enhances the reliability of semiconductor devices by ensuring the upper electrode has sufficient thickness and maintains the integrity of the data storage layers, improving the overall performance and manufacturing efficiency.
Implementation Method 1
performing a selective oxidation process to form a capping oxide layer on a first surface of the material layer, wherein a second surface of the material layer is not oxidized... The selective oxidation process may be an anisotropic oxidation process having a specific oxidation direction
Implementation Method 2
The material layer may then be etched through the second surface of the material layer to form a material pattern... The conductive layer may then be etched through the second surface of the conductive layer to form an upper electrode
Implementation Method 3
The isotropic etching process may be a wet etching process
Data Source
AI summary
A method of manufacturing a semiconductor device may include forming a material layer on a substrate, performing a selective oxidation process to form a capping oxide layer on a first surface of the material layer, wherein a second surface of the material layer is not oxidized, and etching the material layer through the second surface to form a material pattern. An etch rate of the capping oxide layer is less than an etch rate of the material layer. A semiconductor device may include a lower electrode on a substrate, a data storage part on a top surface of the lower electrode, an upper electrode on the data storage part, and a capping oxide layer arranged on at least a portion of a top surface of the upper electrode. The capping oxide layer may include an oxide formed by oxidation of an upper surface of the upper electrode.