Electrostatic Chuck Mechanism with Segmented Heating for Wafer Temperature Uniformity
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Solution Overview
Problem
The existing electrostatic chuck mechanisms fail to maintain uniform temperature across the wafer, particularly between the edge and center portions, due to the limitations in physical dimensions, leading to non-uniformity in etching processes, which does not meet the requirements of advanced nanotechnology nodes.
Innovation Solution
The electrostatic chuck mechanism includes a main electrostatic heating layer on the loading surface and an edge electrostatic heating layer on the step surface, allowing separate temperature adjustments for the center and edge portions of the wafer, along with an edge assembly that electrostatically adsorbs the focus ring to enhance heat transfer and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single heater is provided in the electrostatic chuck, then the structure is simple, but the temperature uniformity between edge and center portions of the wafer deteriorates
Solution Approach 1:
The heater is divided into two independent heating zones: a center heating region with a first heater and an edge heating region with a second heater. This segmentation allows independent temperature control of different wafer regions, resolving the temperature uniformity issue while maintaining structural simplicity through modular design.
Solution Approach 2:
Different heating characteristics are applied to different regions: the center heating region uses a heater configuration optimized for central wafer areas, while the edge heating region uses a different heater configuration optimized for peripheral areas. This local differentiation enables precise temperature control across the entire wafer surface.
2Area of stationary object
If the heater cannot reach the edge portion of the wafer, then the electrostatic chuck size is limited, but the temperature control capability at the wafer edge deteriorates
Solution Approach 1:
The heating structure extends into the vertical dimension by placing the second heater in the edge assembly rather than attempting to extend the first heater laterally to the wafer edge. This vertical arrangement allows the edge heating region to effectively heat the wafer periphery without increasing the horizontal footprint of the electrostatic chuck.
3Temperature
If separate heating regions are provided for center and edge portions, then the temperature uniformity improves, but the device complexity increases
Solution Approach 1:
The center heating region and edge heating region are merged into a single integrated heater assembly where both heating zones share common structural support and control electronics. This integration reduces overall device complexity while maintaining the temperature control benefits of separate heating regions.
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 solution enables precise temperature control and compensation between the edge and center portions of the wafer, improving process uniformity and meeting the requirements of advanced nanotechnology nodes by ensuring consistent temperature distribution during etching processes.
Implementation Method 1
The main electrostatic heating layer, disposed above the loading surface, is configured to secure the wafer and adjust temperature of the wafer
Implementation Method 2
The edge electrostatic heating layer, disposed above the step surface, is configured to secure the focus ring and adjust temperature of the focus ring
Implementation Method 3
a heater is provided in the electrostatic chuck 8 to control a temperature of the wafer 5
Implementation Method 4
an edge assembly that electrostatically adsorbs the focus ring to enhance heat transfer and uniformity
Data Source
AI summary
An electrostatic chuck mechanism and a semiconductor processing device having the same are provided. The electrostatic chuck mechanism includes a base, an edge assembly, a main electrostatic heating layer, and an edge electrostatic heating layer. The base includes a loading surface for loading a wafer and a step surface surrounding the loading surface and located at an edge portion of the wafer. The edge assembly includes a focus ring disposed above the step surface and surrounding the loading surface, and an insulation ring disposed at a bottom of the base and supporting the base. The main electrostatic heating layer, disposed above the loading surface, is configured to secure the wafer and adjust temperature of the wafer. The edge electrostatic heating layer, disposed above the step surface, is configured to secure the focus ring and adjust temperature of the focus ring.