Hardmask Tuning via Electrode Capacitance Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor processing methods face challenges in producing high-quality, carbon-rich films with improved etch selectivity and film density, often resulting in thicker hardmask films that can cause damage and porosity issues during subsequent processing operations.
Innovation Solution
The method involves forming a plasma of a carbon-containing precursor in a semiconductor processing chamber, adjusting a variable capacitor within 20% of its resonance peak to increase capacitance, and using an electrostatic chuck with a DC power supply to deposit a carbon-containing material with greater than 67% carbon content, achieving etch selectivity greater than 2:1 relative to silicon oxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional deposition methods are used to produce carbon-containing films, then film thickness can be increased to improve etch selectivity, but film porosity and damage increase, reducing film quality
Solution Approach 1:
The patent applies parameter changes by adjusting the capacitance of the variable capacitor to operate within 20% of the resonance peak, and setting the DC power supply to specific voltage ranges (200-400V). These parameter adjustments optimize the plasma deposition process to produce films with sufficient etch selectivity (greater than 2:1) while maintaining film density and reducing porosity, thus resolving the contradiction between etch selectivity and film quality
Solution Approach 2:
The patent utilizes phase transitions by controlling the deposition process to achieve proper film densification. By optimizing the plasma parameters through capacitance adjustment near resonance peak and controlling deposition conditions, the carbon-containing films transition from porous to dense structures, achieving both high etch selectivity and film quality simultaneously
2Quantity of substance
If capacitance of variable capacitor is increased within 20% of resonance peak, then carbon content and film density increase, but process complexity increases
Solution Approach 1:
The patent applies universality by using the variable capacitor to serve multiple functions: it acts as both a plasma generation component and a capacitance tuning device to control carbon content. By integrating these functions into a single component and optimizing its operation within 20% of resonance peak, the system achieves high carbon content films without proportionally increasing process complexity
Solution Approach 2:
The patent uses parameter changes by establishing specific operating ranges for the variable capacitor (within 20% of resonance peak) and DC power supply (200-400V). These defined parameter ranges simplify the control process while achieving the desired carbon content (greater than 67 at.%) and film density, reducing the complexity of process optimization
3Productivity
If DC power supply voltage is increased to operate electrostatic chuck, then material deposition efficiency improves, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing the DC power supply voltage to specific ranges (200-400V) that balance deposition efficiency and energy consumption. This optimized voltage range provides sufficient electrostatic chucking force and deposition rate while avoiding excessive energy use, resolving the contradiction between productivity and energy consumption
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 produces carbon-containing films with increased carbon content and density, enhancing etch selectivity and maintaining film quality, allowing for thinner hardmasks with improved operational performance.
Implementation Method 1
adjusting a variable capacitor within 20% of a resonance peak. The variable capacitor may be coupled with an electrode incorporated within a substrate support
Implementation Method 2
adjusting a variable capacitor within 20% of a resonance peak
Implementation Method 3
The electrode incorporated within the substrate support may also be coupled with a DC power supply to operate as an electrostatic chuck
Implementation Method 4
forming a plasma of a carbon-containing precursor in a processing region of a semiconductor processing chamber
Implementation Method 5
depositing a carbon-containing material on the substrate
Data Source
AI summary
Exemplary processing methods may include forming a plasma of a deposition precursor in a processing region of a semiconductor processing chamber. The methods may include adjusting a variable capacitor within 20% of a resonance peak. The variable capacitor may be coupled with an electrode incorporated within a substrate support on which a substrate is seated. The methods may include depositing a material on the substrate.