Canister Temperature Control for Stable Vaporization
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Solution Overview
Problem
In chemical vapor deposition (CVD) methods for thin-film manufacturing, the temperature control of canisters supplying vaporized raw materials is challenging due to sudden temperature variations during vaporization, leading to unstable vaporization rates and supply issues.
Innovation Solution
A method involving a measurement unit, control unit, and heating unit in the canister to measure and calculate a calculated temperature using equations that account for the inner temperature and vaporization rate, allowing for dynamic adjustment of the heating unit to stabilize the canister temperature and maintain consistent vaporization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vaporized raw material is discharged from the canister to the chamber, then the supply amount of vaporized raw material is increased, but the inner pressure of the canister is instantly decreased causing large amount of vaporization and temperature drop
Solution Approach 1:
The control unit calculates a compensation temperature in advance based on the discharge amount of vaporized raw material before the actual discharge occurs. This preliminary calculation allows the heating unit to pre-adjust the temperature, preventing the temperature drop that would otherwise occur during discharge.
Solution Approach 2:
The system applies compensation temperature to cushion against the anticipated temperature drop caused by vaporization heat during discharge. By preparing this temperature compensation beforehand, the system prevents the harmful temperature fluctuation rather than reacting to it after it occurs.
2Stability of the object's composition
If the temperature of the canister is maintained to be greater than the vaporization temperature, then the vaporized raw material is supplied with constant flow rate, but the temperature rapidly decreases due to vaporization heat until the temperature is restored
Solution Approach 1:
The control unit continuously monitors the discharge amount of vaporized raw material and uses this feedback to calculate the appropriate compensation temperature. This closed-loop feedback mechanism ensures that the heating unit adjusts the temperature in real-time to maintain stable vaporization despite fluctuations in discharge conditions.
Solution Approach 2:
The system dynamically changes the temperature parameter by applying compensation temperature based on discharge amount. Instead of maintaining a fixed temperature, the system adjusts the temperature parameter in response to varying discharge conditions, ensuring stable vaporization across different operating states.
3Ease of operation
If a flow rate controller is used to adjust the supply amount, then the supply amount should be controllable, but the supply amount is hardly adjusted due to low vapor pressure of the raw material
Solution Approach 1:
Instead of relying on flow rate control, the system changes the temperature parameter to control the vaporization amount. By adjusting the temperature of the canister through compensation temperature calculation, the system achieves control over the supply amount of vaporized raw material, which is not feasible with flow rate controllers alone due to low vapor pressure.
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 effectively compensates for temperature variations, quickly stabilizes the canister temperature, and ensures a stable supply of vaporized raw materials, preventing overshooting and maintaining consistent vaporization rates.
Implementation Method 1
the raw material is vaporized by heating the canister, and then the vaporized raw material is supplied to a chamber
Implementation Method 2
measuring an inner temperature of the canister
Implementation Method 3
calculating a calculated temperature by applying the inner temperature of the canister to a calculation equation of the control unit
Implementation Method 4
changing a temperature of the heating unit into the calculated temperature
Data Source
AI summary
Disclosed are a raw material supply method including vaporizing a raw material in a canister, discharging the vaporized raw material, measuring an inner temperature of the canister, calculating a calculated temperature by using the inner temperature, and compensating a variation of the inner temperature by heating a heating unit disposed on the canister at the calculated temperature and a raw material supply apparatus applied to the method for supplying the raw material. The raw material supply method and apparatus may stably supply the vaporized raw material to a process space.