Plasma Deposition Reactor Layout for Low-Ion 3D Substrate Processing
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Solution Overview
Problem
Conventional plasma-enhanced atomic layer deposition (PEALD) reactors suffer from significant ion bombardment, leading to defects such as implantations, atom displacements, and stress in the growing layer, particularly on 3D substrates, while the control of ion bombardment for modulating surface reactivity and deposition properties remains limited.
Innovation Solution
A plasma-enhanced deposition reactor design featuring a non-parallel configuration between an electrically conductive plate and a lateral wall, allowing capacitive coupling to generate plasma with adjustable energy and ion density, reducing ion flux and enabling controlled ion bombardment for improved deposition on 2D and 3D substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional CCP reactor is used to generate plasma, then surface reactivity is improved, but ion bombardment causes substrate damage and defects
Solution Approach 1:
The plasma generation function is segmented from the substrate processing function. A separate plasma generation zone is created away from the substrate, allowing plasma to be generated with high reactivity while the substrate is exposed to a gentler plasma environment with reduced ion bombardment damage.
Solution Approach 2:
A plasma intermediary zone is introduced between the plasma generation source and the substrate. This intermediary region allows ions to be generated and then moderated before reaching the substrate, reducing the harmful bombardment effect while preserving the beneficial surface reactivity enhancement.
2Object-affected harmful factors
If ICP reactor is used to limit ion bombardment, then substrate damage is reduced, but control over ion energy and density is limited
Solution Approach 1:
The system introduces dynamic control capabilities by applying RF power to the substrate holder, enabling real-time adjustment of ion energy and flux. This dynamic control allows the system to adapt ion bombardment parameters to specific process requirements, achieving both substrate protection and process versatility.
Solution Approach 2:
The invention enables independent control of multiple plasma parameters including ion energy, ion flux, and plasma density through RF power application to the substrate holder. This parameter control allows optimization of deposition properties while maintaining substrate integrity.
3Manufacturing precision
If additional RF power is applied at substrate holder to extract ions, then deposition properties are improved, but device complexity increases
Solution Approach 1:
The substrate holder is designed to serve multiple functions: it acts as both the substrate support and an RF-powered electrode for plasma generation and ion extraction. This multi-functionality improves deposition control without proportionally increasing device complexity, as the same component performs multiple critical roles.
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 reactor achieves reduced substrate damage and enhanced deposition properties by minimizing ion flux, enabling varied depositions of materials like metals, oxides, and nitrides with improved density, purity, and crystal structure, and supports selective surface and topographic methods.
Implementation Method 1
The upper face of the plate and the lateral wall are separated by a distance configured so as to generate a plasma by capacitive coupling between the plate and the lateral wall
Implementation Method 2
The plasma is generated 3 typically at pressures in the range of a few Torr between two electrodes 110′, 18′ with a radio frequency (RF) power device 16′
Implementation Method 3
the ion bombardment on the plate is however significant
Data Source
AI summary
A plasma-enhanced deposition reactor including a reaction chamber including a plate having an upper face for receiving a substrate, a gas precursor inlet in the chamber, a pumping module of the chamber, a power source configured to apply a radio frequency bias to the plate, wherein a lateral wall of the chamber is at least partially non-parallel to the upper face of the plate, and the upper face of the plate and the lateral wall are separated by a distance d configured so as to generate a plasma by capacitive coupling between the plate and the lateral wall, the plasma is thus generated in a localised manner in the vicinity of the substrate with a low ion flux.