Liquid Bis(alkyltetramethylcyclopentadienyl)zinc CVD Precursor
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Solution Overview
Problem
Existing zinc oxide-based precursors for chemical vapor deposition are typically solid at room temperature, requiring heating to vaporize them, which complicates the deposition process and makes it difficult to control the precursor supply rate.
Innovation Solution
Bis(alkyltetramethylcyclopentadienyl)zinc, which is liquid at room temperature and has high vapor pressure, is used as a precursor for chemical vapor deposition, allowing for precise control of precursor supply and simplifying the deposition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solid zinc oxide-based precursors are used for chemical vapor deposition, then high purity zinc oxide thin films can be deposited, but the precursor must be heated to vaporize it which complicates the deposition process
Solution Approach 1:
The invention changes the physical state parameter of the precursor from solid to liquid at room temperature. The liquid precursor maintains high purity while eliminating the need for complex heating and vaporization systems, as it can be directly supplied to the reaction chamber without phase change equipment
Solution Approach 2:
The invention utilizes the phase transition property by designing a precursor that is liquid at room temperature rather than solid. This eliminates the solid-to-gas phase transition requirement, allowing direct vaporization from liquid state or even direct supply to the reaction chamber, simplifying the deposition system
2Manufacturing precision
If solid precursors are used, then high purity films can be obtained, but the supply rate control becomes difficult due to heating requirements
Solution Approach 1:
By changing the precursor from solid to liquid state at room temperature, the supply rate can be precisely controlled through liquid flow control mechanisms such as syringe pumps or capillary flow, eliminating the difficulty of controlling solid precursor supply rates under heating conditions
3Reliability
If the precursor is solid at room temperature, then thermal stability can be maintained, but the handling and operation become complicated
Solution Approach 1:
The invention changes the state parameter from solid to liquid at room temperature, which dramatically improves handling ease. The liquid precursor can be easily transferred, mixed, and supplied using standard liquid handling equipment, while the molecular structure is designed to maintain thermal stability during the deposition process
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 use of bis(alkyltetramethylcyclopentadienyl)zinc enables the deposition of high-purity zinc oxide thin films with improved thermal stability and vaporizability, facilitating easier handling and more precise control over the deposition process, particularly in atomic layer deposition.
Implementation Method 1
the precursor for chemical vapor deposition is supplied to a reaction chamber equipped with a substrate in a gaseous state, and then the precursor undergoes a thermal decomposition, a chemical reaction, a photochemical reaction, or the like on the substrate
Implementation Method 2
in the case of the thermal decomposition, the precursor for chemical vapor deposition is brought into contact with the substrate heated to a temperature higher than the thermal decomposition temperature of the precursor to deposit a metal film on the substrate
Implementation Method 3
the precursor for chemical vapor deposition is supplied to a reaction chamber equipped with a substrate in a gaseous state
Data Source
AI summary
Provided is a precursor for chemical vapor deposition for depositing a zinc-containing thin film. Bis(alkyltetramethylcyclopentadienyl)zinc represented by the formula (1) which is liquid at room temperature and is therefore easy to handle (in the formula (1), R1 and R2 are alkyl group having 3 carbon atoms); a precursor for chemical vapor deposition comprising bis(alkyltetramethylcyclopentadienyl)zinc represented by the formula (2) (in the formula (2), R3 and R4 are alkyl group having 2-5 carbon atoms); and a production method for a zinc-containing thin film through chemical vapor deposition.