Solid Precursor Gas Dispensing with Dual-Zone Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solutions for distributing gaseous phases of solid precursors in chemical vapor deposition processes face challenges such as unreliable sublimation temperatures, variable precursor concentration, and risk of condensation during transport, which affect process reliability and flexibility.
Innovation Solution
A device comprising a container for the solid precursor, a first heating means to sublimate the precursor, and a second heating means with air circulation to maintain a uniform temperature profile within an enclosure, reducing condensation risks and allowing flexible flow rate adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a solid precursor is heated in a conventional heating device, then the solid precursor melts and forms a liquid pool, but the liquid pool cannot be uniformly distributed on the substrate and causes poor film quality
Solution Approach 1:
The heating device is divided into multiple independently controllable heating zones along the substrate path. Each zone can be heated to different temperatures to control the melting and distribution of the solid precursor at different locations, replacing the conventional single-zone heating that creates uncontrolled liquid pools.
Solution Approach 2:
The solid precursor is pre-melted in a controlled manner within the heating device before being deposited onto the substrate. This preliminary melting action ensures uniform distribution of the liquid precursor across the substrate surface, preventing the formation of uneven liquid pools during the deposition process.
2Quantity of substance
If the solid precursor is heated to high temperature, then the solid precursor melts effectively, but the organic component decomposes and generates harmful gases
Solution Approach 1:
Instead of using high temperatures to melt the solid precursor, the invention changes the heating parameters to use lower temperatures with extended heating time. The heating device maintains a temperature gradient that allows gradual melting of the solid precursor without reaching the decomposition temperature of the organic component, thereby preventing harmful gas generation.
Solution Approach 2:
The heating device provides continuous, extended heating to the solid precursor over an extended period. This continuous heating action at controlled temperatures ensures complete melting and uniform distribution of the precursor without causing thermal decomposition, as the temperature is maintained below the decomposition threshold throughout the entire heating process.
3Productivity
If the liquid precursor is deposited at high speed, then the coating process is efficient, but the liquid precursor cannot be uniformly distributed and causes poor film quality
Solution Approach 1:
The heating device employs dynamic temperature control with multiple independently adjustable heating zones. The temperature at each zone can be dynamically adjusted based on the real-time deposition status, allowing the system to maintain high coating speed while ensuring uniform distribution of the liquid precursor through adaptive thermal management.
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 device ensures stable and flexible distribution of the gaseous precursor, maintaining the desired sublimation temperature and precursor concentration, while minimizing condensation and ensuring reliable operation across varying process demands.
Implementation Method 1
a heating device for heating the solid precursor in a heating chamber of the dispensing device
Implementation Method 2
heating the solid precursor to melt the solid precursor and form a liquid pool
Implementation Method 3
a dispensing device for depositing a coating on a substrate
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a device for dispensing a gas phase of at least one solid precursor, said device comprising a container (1) intended to contain a solid phase (11) of said precursor, a first heating means (10) configured to heat at least one part of the container (1) and/or of the solid phase (11) so as to form a gas phase (12) of said precursor in the container (1), and dispensing means (13, 14) fluidically connected to the container (1) and configured to dispense the gas phase (12) from the container (1) to a point of use (60). According to the invention, the device comprises a chamber (2) which has an internal volume within which are the container (1) and said dispensing means (13, 14), said device also comprising a second heating means (20) configured to heat at least one part of the internal volume of the chamber (2).