Multi-Zone Electrostatic Chuck Biasing for Plasma Uniformity
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Solution Overview
Problem
As semiconductor devices continue to shrink in size, advanced technology nodes face challenges in dimension scaling and plasma processing, leading to difficulties in achieving uniformity and control over etching and deposition processes.
Innovation Solution
A plasma processing apparatus with a multi-zone DC pulsing technology and dynamically controlled bias voltages applied to different regions of an electrostatic chuck, allowing for improved bias uniformity and adjustable biasing during plasma processing, which enhances control over ion energy and directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional plasma processing is used, then processing can be performed, but uniformity and control over etching and deposition processes deteriorate as feature sizes are reduced
Solution Approach 1:
The electrostatic chuck is divided into multiple independently controllable electrode regions (first electrode region, second electrode region, third electrode region) that can be biased separately. This segmentation allows different zones of the wafer to receive customized plasma processing conditions, enabling precise control over etching and deposition uniformity across the wafer surface while adapting to advanced technology nodes.
Solution Approach 2:
Different electrode regions are assigned different bias voltages and pulsing characteristics tailored to local processing requirements. The first electrode region receives a first bias voltage waveform, the second electrode region receives a second bias voltage waveform, and the third electrode region receives a third bias voltage waveform, allowing each zone to be optimized for specific process requirements and achieving superior local quality control.
2Manufacturing precision
If multi-zone DC pulsing technology is applied, then uniformity and control of plasma processes improve, but device complexity increases
Solution Approach 1:
Multiple electrode regions are integrated into a single electrostatic chuck structure that maintains wafer holding functionality while incorporating segmented biasing capability. The separate electrode regions are electrically isolated but physically integrated, allowing independent voltage control without requiring separate processing chambers or complex mechanical systems.
Solution Approach 2:
The bias voltages applied to different electrode regions are dynamically adjustable during the plasma process. The system can modify voltage magnitudes, pulsing frequencies, and waveform characteristics in real-time to optimize processing conditions, providing dynamic control that adapts to process requirements without permanent structural changes.
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 improves the uniformity and control of plasma processes, reducing damage to semiconductor wafers and enhancing the integration density of electronic components by allowing for precise adjustment of bias voltages and ion flow direction.
Implementation Method 1
an electrostatic chuck configured to hold a semiconductor wafer during a process performed on the semiconductor wafer
Implementation Method 2
a plasma processing apparatus with a multi-zone DC pulsing technology and dynamically controlled bias voltages applied to different regions of an electrostatic chuck, allowing for improved bias uniformity and adjustable biasing during plasma processing
Data Source
AI summary
Processing apparatuses and methods are provided. A processing apparatus includes an electrostatic chuck configured to hold a semiconductor wafer during a process performed on the semiconductor wafer; a first electrode configured to bias a first region of the electrostatic chuck with a first bias; and a second electrode configured to bias a second region of the electrostatic chuck with a second bias.