Symmetric Antenna Array Layout for Uniform HDP Film Deposition
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Solution Overview
Problem
Achieving uniform film thickness across large substrates in high-density plasma (HDP) chambers is challenging due to difficulties in maintaining uniform plasma production as substrate sizes increase.
Innovation Solution
A symmetric antenna array system with dielectric windows, inductive couplers, and a controller that adjusts processing parameters to ensure uniform gas flow and plasma formation across multiple zones within the processing chamber, allowing for tailored gas distribution and improved deposition uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single RF antenna is used to generate plasma, then the device complexity is low, but the film thickness uniformity across large substrates deteriorates
Solution Approach 1:
The single RF antenna is segmented into multiple individual RF antennas arranged in an array. Each antenna independently generates plasma in its respective zone, enabling localized control of plasma density and gas distribution, which directly improves film thickness uniformity across large substrate areas while managing device complexity through modular design
Solution Approach 2:
Each antenna in the array provides localized plasma generation with tailored gas distribution to specific zones. The system adjusts gas flow and plasma parameters independently for each antenna zone, creating locally optimized conditions that collectively achieve uniform film deposition across the entire large substrate surface
2Productivity
If substrate size is increased to improve productivity, then the manufacturing output increases, but the film thickness uniformity deteriorates
Solution Approach 1:
The large substrate area is divided into multiple processing zones, each served by an individual antenna. This segmentation allows each zone to be independently optimized for uniform plasma distribution, enabling the system to handle larger substrates while maintaining film thickness uniformity across the entire surface
Solution Approach 2:
The system transitions from a single-point plasma source to a distributed array of plasma sources across the substrate surface. This dimensional expansion allows simultaneous processing of large substrate areas with localized control, maintaining uniformity by addressing each spatial dimension independently through the antenna array configuration
3Manufacturing precision
If multiple gas distribution zones are introduced to improve uniformity, then the film thickness uniformity improves, but the device complexity increases
Solution Approach 1:
The gas distribution system is merged with the antenna array structure, where each antenna zone integrates both plasma generation and gas distribution functions. This combination eliminates the need for separate complex gas distribution infrastructure, achieving uniform film thickness through integrated zone control while managing device complexity through functional consolidation
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 solution enhances film thickness uniformity across large substrates by maintaining consistent plasma production and deposition rates, enabling efficient manufacturing of electronic devices on larger substrates.
Implementation Method 1
The precursor gas in the chamber is energized (e.g., excited) into a plasma by applying a single or array of radio frequency (RF) antennas inductively coupled to the precursor gas to form the plasma
Implementation Method 2
A plurality of dielectric windows are coupled to a support structure
Data Source
AI summary
The present disclosure is directed to an antenna array. The antenna array includes a plurality of dielectric windows coupled to a support structure comprising a plurality of gas ports, a primary frame comprising a primary conduit connected to a power source and a plurality of secondary frames supported by the primary frame. The secondary frame includes a secondary conduit connected to the primary conduit. A plurality of inductive couplers are disposed over the plurality of dielectric windows and supported by the secondary frames. The plurality of inductive couplers include a plurality of antenna connectors and a plurality of plurality of antennas. The plurality of antenna connectors connect the plurality of antennas to the secondary conduit.