Hexagonal Boron Nitride Epitaxy at Low Growth Temperature
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Solution Overview
Problem
Current methods for fabricating hexagonal boron nitride require high temperatures, making them costly and inefficient, and result in polycrystalline structures that are prone to defects, affecting the performance of insulating and anti-diffusion films in electronic devices.
Innovation Solution
A method involving the use of a catalytic metal with a hexagonal crystal structure and a lattice mismatch of 0-15% with hexagonal boron nitride, grown at temperatures of 350-800°C using inductively coupled plasma chemical vapor deposition, with a nitrogen and boron source, and surface purification to achieve a monocrystalline structure with low surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature (1000-1500°C) thermo-chemical vapor deposition is used to grow hexagonal boron nitride, then the growth process can be completed, but the production cost increases and the resulting polycrystalline structure contains defects
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperature (1000-1500°C) to low temperature (350-800°C) range, and modifies the atmospheric composition by introducing plasma environment. This parameter transformation enables hexagonal boron nitride growth at lower temperatures while maintaining or improving film quality through plasma-enhanced reaction efficiency.
Solution Approach 2:
The patent introduces plasma as an intermediary medium to facilitate the chemical vapor deposition process at low temperatures. The plasma environment activates the boron and nitrogen sources, enabling reaction and film growth without requiring high thermal energy, thus resolving the contradiction between temperature and film quality.
2Ease of manufacture
If high temperature processing is used, then hexagonal boron nitride can be grown, but production costs increase
Solution Approach 1:
The patent transforms the temperature parameter from high (1000-1500°C) to low (350-800°C) range, directly reducing energy consumption and production costs. The plasma enhancement compensates for the lower temperature, maintaining effective film growth without requiring expensive high-temperature infrastructure.
3Manufacturing precision
If conventional high temperature deposition is used, then hexagonal boron nitride film can be formed, but the crystal structure becomes polycrystalline with defects
Solution Approach 1:
The patent changes multiple parameters simultaneously: temperature (to 350-800°C), atmospheric composition (plasma environment), and pressure conditions. These parameter transformations promote epitaxial growth and monocrystalline structure formation, eliminating the polycrystalline defects that occur in conventional high-temperature processes.
Solution Approach 2:
The plasma environment provides periodic energy input through ion bombardment and radical generation, which promotes ordered atomic arrangement and crystal growth. This periodic energy delivery mechanism facilitates monocrystalline structure formation rather than random polycrystalline growth.
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 method allows for the low-temperature epitaxial growth of high-quality monocrystalline hexagonal boron nitride, reducing production costs and improving the performance of films as insulators and substrates for electronic devices.
Implementation Method 1
growing hexagonal boron nitride on the catalytic metal at a temperature of 800° C. or lower while supplying a nitrogen source and a boron source into the chamber
Implementation Method 2
growing hexagonal boron nitride on the catalytic metal at a temperature of 800° C. or lower while supplying a nitrogen source and a boron source into the chamber
Implementation Method 3
growing hexagonal boron nitride on the catalytic metal at a temperature of 800° C. or lower
Implementation Method 4
placing a catalytic metal in a chamber, the catalytic metal having a hexagonal crystal structure and having a lattice mismatch of greater than 0% and less than or equal to 15% with hexagonal boron nitride
Data Source
AI summary
Disclosed herein is a method of fabricating hexagonal boron nitride in which hexagonal boron nitride is epitaxially grown. A method of fabricating hexagonal boron nitride includes placing a catalytic metal in a chamber, the catalytic metal having a hexagonal crystal structure and having a lattice mismatch of 15% or less with hexagonal boron nitride (h-BN) in a chamber; and growing hexagonal boron nitride on the catalytic metal at a temperature of 800° C. or lower while supplying a nitrogen source and a boron source into the chamber.