Remote Plasma Epitaxy for Low-Temperature Super-Lattice Deposition
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Solution Overview
Problem
Conventional plasma enhanced chemical vapor deposition systems face challenges in balancing growth rate and thermal consumption, leading to instability and chamber coating issues due to high energy consumption and exceeding the thermal budget of semiconductor materials.
Innovation Solution
A semiconductor processing system with separate inlets for vapor phase and plasma generated reactants, separated by an isolating member, allows for isothermal epitaxial deposition of super-lattice structures by maintaining spatial separation until reactants are proximate to the substrate, preventing premature reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If temperature is increased to facilitate chemical reactions, then growth rate is improved, but energy consumption increases and thermal budget is exceeded
Solution Approach 1:
The system divides the reactant delivery into two separate pathways: a first inlet for vapor phase reactants and a second inlet for plasma generated reactants. This segmentation allows independent control of reactant introduction, enabling chemical reactions to proceed at lower temperatures while maintaining growth rate, thus resolving the contradiction between productivity and energy consumption.
Solution Approach 2:
The invention changes the physical state and activation method of reactants by introducing plasma generated reactants separately from vapor phase reactants. This parameter change enables reactions to occur at reduced temperatures, improving energy efficiency while maintaining deposition rate, thereby resolving the energy consumption vs. growth rate contradiction.
2Productivity
If temperature is increased to facilitate chemical reactions, then growth rate is improved, but material stability deteriorates
Solution Approach 1:
By segmenting the reactant delivery system into separate inlets for vapor phase and plasma generated reactants, the system enables low-temperature deposition that maintains material stability. The separated pathways allow controlled reaction conditions that prevent thermal damage to semiconductor materials while achieving adequate growth rates.
Solution Approach 2:
The invention changes the reaction temperature parameter by utilizing plasma activation instead of thermal activation. This parameter change allows chemical reactions to proceed at temperatures that preserve material stability and prevent degradation, while still achieving the required growth rate through enhanced reactant reactivity.
3Productivity
If temperature is increased to facilitate chemical reactions, then growth rate is improved, but chamber coating occurs
Solution Approach 1:
The segmented inlet system delivers reactants through separate pathways, with plasma generated reactants introduced away from the chamber walls. This spatial segmentation prevents premature reactions and by-product formation on chamber surfaces, eliminating chamber coating issues while maintaining growth rate through efficient reactant utilization.
Solution Approach 2:
The isolating member acts as an intermediary that directs plasma generated reactants away from the chamber walls and toward the substrate. This intermediary structure prevents harmful by-products from depositing on chamber surfaces, resolving the chamber coating problem while preserving growth rate through controlled reactant flow.
4Productivity
If vapor phase reactant and plasma generated reactant are mixed early, then reaction efficiency is improved, but premature reactions and by-product formation occur
Solution Approach 1:
The system segments the reactant flow paths with separate inlets and an isolating member, preventing premature mixing of vapor phase and plasma generated reactants. This segmentation maintains manufacturing precision by controlling where reactions occur (at the substrate surface), while still achieving high reaction efficiency through the enhanced reactivity of plasma activated species.
Solution Approach 2:
The isolating member serves as an intermediary barrier that prevents premature reactions between reactant types until they reach the substrate vicinity. This intermediary structure ensures precise deposition control by localizing reactions to the substrate surface, while maintaining high reaction efficiency through the plasma-activated state of the reactants.
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
Enables efficient deposition of super-lattice structures at consistent temperatures, optimizing performance, throughput, and reducing energy consumption by preventing premature reactions and by-product formation.
Implementation Method 1
a remote plasma unit having a plasma outlet coupled to the second inlet and configured to generate the plasma generated reactant by the decomposition of a second vapor phase reactant
Implementation Method 2
an isolating member positioned between the first inlet and the second inlet and configured to isolate the first vapor phase reactant from the plasma generated reactant until the first vapor phase reactant and plasma generated reactant are proximate to the substrate support
Implementation Method 3
an epitaxial layer (e.g., a material layer) can be deposited on a substrate, such as a silicon wafer
Implementation Method 4
In plasma enhanced chemical vapor deposition, an epitaxial layer (e.g., a material layer) can be deposited on a substrate
Data Source
AI summary
Methods and apparatuses for a material layer deposition method in a semiconductor manufacturing system. A controller may seat a substrate on a substrate support. A first vapor phase reactant may be provided to a first inlet, and a second vapor phase reactant may be provided to a remote plasma unit, which may decompose at least a portion of the precursor. An epitaxial material layer comprising silicon may be deposited onto the substrate using a decomposition product.