Ion Beam Etching Chamber Baffles for By-Product Re-Deposition
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Solution Overview
Problem
Ion beam etching processes result in the re-deposition of etching by-products onto the workpiece during venting, leading to defects and reduced yield due to turbulent gas conditions, particularly affecting materials like ceramics.
Innovation Solution
An ion beam etching apparatus with baffles and a by-product redistributor that moves etching by-products from outside the baffles to directly below them, utilizing temperature or pressure gradients to minimize re-deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ion beam etching is performed to achieve high density features, then manufacturing precision is improved, but re-deposition of etching by-products occurs during venting causing defects
Solution Approach 1:
The processing chamber is divided into distinct regions using baffles: a first region containing the substrate holder where etching occurs, and a second region below the baffles where by-products are redirected. This segmentation prevents by-products from the first region from re-depositing on the substrate during venting, while maintaining the precision etching capability in the first region.
Solution Approach 2:
Baffles serve as intermediary structures positioned between the substrate holder and the chamber bottom. These baffles intercept etching by-products falling from the first region and redirect them to the second region, acting as a mediator that prevents direct contact between by-products and the substrate surface during pressure changes.
2Productivity
If conventional etching processes are used without by-product management, then device complexity is low, but yield is reduced due to defects from re-deposition
Solution Approach 1:
The chamber is segmented into functional zones using baffles that create a first region for etching and a second region for by-product collection. This structural segmentation increases device complexity but eliminates re-deposition defects, thereby improving overall yield and productivity.
Solution Approach 2:
The harmful by-products are extracted from the etching region by redirecting them below the baffles into a separate collection zone. This extraction of contaminants from the work area prevents defects and improves yield, despite the added structural complexity of the baffle system.
3Reliability
If baffles are added to prevent re-deposition, then reliability is improved, but device complexity increases
Solution Approach 1:
Baffles segment the chamber into protected and collection zones, improving workpiece reliability by preventing by-product contamination. The segmentation adds structural complexity but ensures consistent high-quality results by isolating the substrate from harmful re-deposition effects.
Solution Approach 2:
Baffles act as intermediary protective structures that enhance reliability by mediating between the etching process and the substrate. While these intermediaries increase device complexity, they reliably prevent defects and improve overall workpiece quality.
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
Reduces defects on the workpiece by preventing the re-deposition of etching by-products, thereby increasing yield and reliability.
Implementation Method 1
utilizing temperature or pressure gradients to minimize re-deposition
Implementation Method 2
utilizing temperature or pressure gradients to minimize re-deposition
Data Source
AI summary
In some embodiments, the present disclosure relates to a semiconductor processing apparatus. The semiconductor processing apparatus includes a substrate holder within a processing chamber and a plasma source in communication with the processing chamber. One or more baffles respectively have a horizontally extending surface vertically between the substrate holder and a lower surface of the processing chamber. The substrate holder includes a workpiece reception surface that is configurable to face towards the one or more baffles. A cooler is arranged directly below the horizontally extending surface of the one or more baffles and a heater is arranged along the lower surface of the processing chamber and laterally outside of the one or more baffles.