PECVD Chamber Control for Uniform 3D Semiconductor Layer Deposition
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Solution Overview
Problem
Current layer formation processes in the semiconductor industry struggle to achieve uniformity in three-dimensional device structures due to non-uniformities in each layer, which can lead to unusable structures when many layers are formed sequentially.
Innovation Solution
A plasma deposition process and apparatus that control gas flow uniformity, temperature uniformity of chamber surfaces, and plasma density profile to achieve extremely uniform layers on a substrate, using a chamber with a gas distributor, metrology device, and substrate support with thermal zones, allowing for real-time adjustments to maintain uniformity across the substrate surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current layer formation processes are used, then the number of layers can be increased to extend device structures into the third dimension, but non-uniformities in each layer multiply resulting in unusable structures
Solution Approach 1:
The gas distributor is divided into multiple independently controllable zones that can deliver different gas flows to different regions of the substrate. This allows local adjustment of deposition conditions to compensate for spatial non-uniformities, enabling formation of uniform layers even when stacking many layers sequentially in three-dimensional structures
Solution Approach 2:
The system incorporates real-time monitoring and control mechanisms that measure layer formation characteristics and adjust process parameters dynamically. This feedback control prevents non-uniformities from accumulating across multiple layers by correcting deviations as they occur during the deposition process
2Adaptability or versatility
If sequential layer deposition is performed to create three-dimensional device structures, then processing capability is increased, but non-uniformities accumulate making structures unusable
Solution Approach 1:
Different regions of the substrate receive tailored gas flows and deposition conditions through the zoned gas distributor, allowing the process to adapt to the specific geometric requirements of three-dimensional structures while maintaining uniform layer quality that ensures structure usability
Solution Approach 2:
The system dynamically adjusts process parameters during sequential layer deposition to maintain consistency. By making real-time modifications to gas flow rates, pressure, and other parameters, the process remains reliable even when forming complex three-dimensional device structures with over 100 layers
3Manufacturing precision
If uniform gas flow and temperature control are implemented, then layer uniformity is improved, but device complexity increases
Solution Approach 1:
The gas distributor is segmented into multiple zones with independent control, allowing uniform gas flow distribution across the substrate without requiring overly complex global control mechanisms. Each zone can be controlled independently to achieve overall uniformity while keeping individual control elements relatively simple
Solution Approach 2:
The chamber design integrates multiple functions into unified components. The gas distributor serves both as a gas delivery system and a temperature control interface, while the substrate support performs both mechanical support and thermal management, reducing overall system complexity while maintaining layer uniformity
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 process enables the formation of layers with thickness uniformity of 2% or better, allowing for the deposition of up to 150 layers in a single sequential process while maintaining a planar, laminar, and parallel stack structure, enhancing the quality and reliability of three-dimensional semiconductor devices.
Implementation Method 1
a gas distributor having a plurality of gas flow openings formed therethrough
Implementation Method 2
a metrology device to direct light through one of the gas flow openings and record light reflected through the gas flow opening
Implementation Method 3
an electrode between the gas distributor and the side wall, the electrode coupled to a first tuning circuit
Implementation Method 4
a substrate support disposed in the internal volume of the chamber, the substrate support having a plurality of thermal zones
Data Source
AI summary
A method of processing a substrate according to a PECVD process is described. Temperature profile of the substrate is adjusted to change deposition rate profile across the substrate. Plasma density profile is adjusted to change deposition rate profile across the substrate. Chamber surfaces exposed to the plasma are heated to improve plasma density uniformity and reduce formation of low quality deposits on chamber surfaces. In situ metrology may be used to monitor progress of a deposition process and trigger control actions involving substrate temperature profile, plasma density profile, pressure, temperature, and flow of reactants.