Adjustable Gas Injectors for Uniform CVD Film Deposition
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Solution Overview
Problem
Existing substrate processing methods, particularly in semiconductor manufacturing, face challenges with non-uniform film deposition due to exothermic reactions between semiconductor precursors and etchants, leading to premature reactant breakdown, equipment damage, and substrate contamination.
Innovation Solution
The implementation of a reactor design with separate adjustable gas delivery paths for precursors and etchants, which mix only at the reaction chamber, avoiding high-pressure interactions and allowing controlled flow profiles to minimize reactivity and ensure uniform deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate gas delivery paths with adjustable injectors are used to control reactant distribution, then manufacturing precision of film deposition is improved, but device complexity increases
Solution Approach 1:
The gas delivery system is segmented into separate delivery paths for precursor and etchant gases, each with its own adjustable injector. This allows independent control of each gas flow profile, enabling precise control over reactant distribution and film deposition uniformity without requiring complete system redesign.
Solution Approach 2:
The injectors are designed with adjustable features that allow dynamic control of gas flow profiles. The adjustable injectors can be configured to optimize reactant distribution under different process conditions, providing adaptability while maintaining manageable system complexity through modular design.
2Object-affected harmful factors
If gases are mixed at the reaction chamber only, then harmful exothermic reactions are reduced, but gas flow control complexity increases
Solution Approach 1:
The mixing of precursor and etchant gases is extracted from upstream locations and delayed until the reaction chamber. The separate gas delivery paths keep gases isolated until they reach the designated mixing zone, preventing premature exothermic reactions while using standard flow control components to manage the delayed mixing process.
Solution Approach 2:
The reaction chamber serves as an intermediary space where gases are allowed to mix under controlled conditions. The adjustable injectors act as mediators that control the timing and profile of gas introduction into this intermediary zone, enabling safe mixing without upstream exothermic reactions.
3Manufacturing precision
If adjustable gas injectors are used to control flow profiles, then deposition selectivity is improved, but ease of operation decreases
Solution Approach 1:
The adjustable injectors provide local control over gas flow profiles at specific locations within the reaction chamber. This localized adjustment capability enables optimization of deposition selectivity in different regions without requiring global system adjustments, making the operation more intuitive and manageable.
Solution Approach 2:
The injectors allow independent adjustment of flow rate parameters for different gases. By changing flow parameters locally at each injector, operators can optimize deposition selectivity and uniformity without complex interdependent adjustments, simplifying the operational process while maintaining high precision.
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 reduces the risk of premature reactions, equipment damage, and contamination, while enhancing control over reactant distribution for improved film quality and selectivity in semiconductor processing.
Implementation Method 1
a first set of adjustable gas injectors that inject the first gas into the mixing space and control a gas flow profile of the first gas into the mixing space
Implementation Method 2
separate gas delivery paths for the first and second gases to a mixing space within the reaction chamber... avoiding high-pressure interactions
Implementation Method 3
The first and second gases mix at the mixing space and form a common flow path from the mixing space to the substrate support
Implementation Method 4
chemical vapor deposition (CVD) reactor... in which atoms or molecules contained in a vapor deposit on a wafer and build up to form a film
Implementation Method 5
strong exothermic reactions have been observed, potentially leading to premature reactant breakdown, damage to the gas intermixing tank, combustion, and substrate contamination
Data Source
AI summary
Methods and apparatuses for separately injecting gases into a reactor for a substrate processing system. The flow profiles of the gases are controlled with two or more sets of adjustable gas flow injectors. The methods are particularly useful for selective deposition of gases in a CVD system using volatile combinations of precursors and etchants. In either case, the gases are provided along separate flow paths that intersect in a relatively open reaction space, rather than in more confined upstream locations.