Conductive Line Manufacturing Sidewall Protection
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Solution Overview
Problem
The challenge in manufacturing conductive lines on circuit boards is the inconsistency in line width and space, leading to issues such as open circuits and suspended lines due to under-etching or over-etching, which affects device performance as electronic devices scale down.
Innovation Solution
A method involving the formation of a first metal layer, a second metal layer, conductive lines, a protective layer on sidewalls, and controlled etching to prevent lateral and vertical etching, ensuring stable line quality by using a protective layer on sidewalls and capping layers to manage etching rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional etching processes are used without protective layers, then the manufacturing process is simple, but the conductive lines suffer from lateral etching and inconsistent line width
Solution Approach 1:
A protective layer is formed on the sidewalls of conductive lines before the etching process. This preliminary protective action prevents lateral etching during the etching process, ensuring consistent line width and spacing without requiring complex in-process adjustments
Solution Approach 2:
The protective layer acts as an intermediary between the etchant and the conductive lines. It selectively protects the sidewalls from lateral etching while allowing the etching process to proceed vertically, thereby maintaining line width consistency without interfering with the overall etching efficiency
2Productivity
If higher etching rate is used to increase productivity, then manufacturing speed improves, but over-etching occurs causing open circuits and suspended lines
Solution Approach 1:
Capping layers are formed over the conductive lines before the etching process. These capping layers provide preliminary protection against over-etching, allowing the use of higher etching rates to increase productivity while preventing damage that would cause open circuits or suspended lines
Solution Approach 2:
The capping layers serve as a cushioning layer that absorbs the excess etching action. By placing this protective layer beforehand, the system can tolerate higher etching rates without compromising circuit integrity, as the capping layer prevents the etchant from attacking the conductive lines excessively
Data Source
AI summary
A method for manufacturing conductive lines is provided. A first metal layer is formed over a carrier substrate. A second metal layer is formed over the first metal layer. A plurality of first conductive lines is formed on the second metal layer. A protective layer is formed on opposite sidewalls of the first conductive lines. An exposed portion of the second metal layer is removed to expose a portion of the first metal layer. The exposed portion of the first metal layer is removed, and the protective layer is removed.