Precursor Delivery for Conformal Low-Resistivity Vanadium Nitride Films
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Solution Overview
Problem
Existing semiconductor deposition technologies face challenges in achieving high conformality, uniformity, and throughput in depositing vanadium nitride thin films, particularly in high aspect-ratio structures, due to limitations in precursor delivery systems and conductance of precursor delivery lines.
Innovation Solution
A thin film deposition system with high conductance reservoir portions in the precursor delivery lines, combined with ALD valves, allows for increased precursor dosage and stability, reducing exposure times and pressure fluctuations, thereby improving step coverage and uniformity in vanadium nitride thin films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional precursor delivery lines are used, then device complexity is reduced, but manufacturing precision and conformality deteriorate in high aspect-ratio structures
Solution Approach 1:
The precursor delivery system is segmented into multiple functional components: a high conductance reservoir portion separated from the canister by a first valve, and a deposition chamber connected by a second valve. This segmentation allows independent control and optimization of each section, enabling high conformality while managing system complexity through modular design.
Solution Approach 2:
The high conductance reservoir portion acts as an intermediary between the precursor canister and the deposition chamber. It buffers and stabilizes precursor flow, ensuring consistent delivery to the substrate while isolating the chamber from pressure fluctuations in the canister, thereby achieving improved conformality without proportionally increasing overall system complexity.
2Manufacturing precision
If longer exposure times are used, then manufacturing precision improves, but productivity deteriorates
Solution Approach 1:
The high conductance reservoir portion is pre-filled with vaporized precursor and maintains a stable pressure reservoir before deposition begins. This preliminary preparation ensures that when deposition starts, uniform precursor delivery is immediately achieved without requiring extended exposure times, thus maintaining productivity while ensuring uniformity.
Solution Approach 2:
The system dynamically adjusts precursor delivery through the controlled operation of first and second valves, which regulate flow between the reservoir and chamber. This dynamic control allows optimal precursor dosing during deposition, achieving uniform films at reduced exposure times and improved throughput.
3Productivity
If frequent valve operations are performed, then productivity improves, but reliability deteriorates due to increased wear
Solution Approach 1:
The high conductance reservoir portion is pre-charged with precursor vapor before the deposition cycle begins. This preliminary action reduces the frequency of valve operations during actual deposition, as the reservoir can supply precursor without requiring continuous valve opening/closing, thereby reducing wear while maintaining high productivity.
Solution Approach 2:
The reservoir acts as a buffer that decouples the frequency of valve operations from the deposition process. By maintaining a stable precursor supply in the reservoir, the system can perform rapid deposition cycles with fewer valve actuations, reducing mechanical wear on valves while sustaining high throughput.
4Productivity
If rapid deposition is performed, then productivity improves, but manufacturing precision deteriorates due to pressure fluctuations
Solution Approach 1:
The high conductance reservoir portion is designed to cushion pressure fluctuations before they reach the deposition chamber. By absorbing pressure variations during rapid precursor delivery, the reservoir ensures stable deposition conditions are maintained even at high speeds, achieving both productivity and manufacturing precision simultaneously.
Solution Approach 2:
The reservoir serves as a pressure-stabilizing intermediary between the rapid precursor source and the deposition chamber. It filters out high-frequency pressure fluctuations while maintaining overall precursor flow rate, enabling rapid deposition without sacrificing film uniformity.
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 system enhances deposition efficiency, achieving high conformality and uniformity in vanadium nitride films, especially in high aspect-ratio structures, with improved throughput and reduced wear on ALD valves.
Implementation Method 1
a canister including a liquid vanadium precursor and a volume of gas including vaporized vanadium precursor
Implementation Method 2
a partial pressure of Cl2 in the thin film deposition chamber resulting from a decomposition of the liquid vanadium precursor
Data Source
AI summary
The disclosed technology relates generally to semiconductor manufacturing, and more particularly to precursor delivery in cyclic deposition of vanadium nitride thin films. In one aspect, a method of depositing a vanadium nitride thin film comprises providing a thin film deposition system comprising a vanadium precursor delivery line comprising first and second valves disposed between a final valve and a vanadium precursor source comprising a canister including a liquid vanadium precursor and a volume of gas including vaporized vanadium precursor. The method additionally comprises conditioning the vanadium precursor source, without a substrate in a thin film deposition chamber, by controllably removing a portion of the volume of gas in the canister by sequentially opening the first and second valves. The method additionally comprises disposing the substrate in the thin film deposition chamber and alternatingly exposing the substrate to the vaporized vanadium precursor and a nitrogen precursor.