Room Temperature CVD on Flexible Polymer Substrates
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Solution Overview
Problem
Conventional chemical vapor deposition methods are unsuitable for flexible polymer substrates due to their low mechanical strength, high contraction rate, and limited temperature resistance, which prevents the deposition of thin films at room temperature, leading to potential substrate damage and poor conformal deposition.
Innovation Solution
A method and apparatus for room temperature chemical vapor deposition where the source gas is heated in a shower head before reaching the substrate, allowing for thermal decomposition and deposition of a dielectric thin film without heating the flexible polymer substrate, using a vapor mixture of bismuth and niobium at 220° C to 270° C, and maintaining the substrate at 40 to 60° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chemical vapor deposition is used on flexible polymer substrates, then thin film deposition can be achieved, but the substrate must be heated to high temperature which causes substrate damage and poor conformal deposition
Solution Approach 1:
The patent divides the heating function into two separate locations: the shower head is heated to decompose precursors, while the substrate remains unheated or at low temperature. This segmentation allows the deposition process to occur without heating the substrate, avoiding substrate damage while maintaining thin film quality
Solution Approach 2:
The shower head acts as an intermediary component that performs the heating function normally required for CVD. By placing the heating element in the shower head rather than on the substrate, the patent enables precursor decomposition without direct thermal exposure to the substrate, thus preventing damage
2Productivity
If the substrate is heated to decompose precursors in conventional CVD, then chemical vapor deposition can proceed, but the flexible polymer substrate cannot withstand the temperature
Solution Approach 1:
The patent separates the heating function from the substrate by heating the shower head instead. This allows the deposition process to proceed at room temperature on the substrate while still providing the thermal energy needed for precursor decomposition in the shower head
Solution Approach 2:
The shower head serves as an intermediary that provides the necessary thermal decomposition environment for precursors without transferring heat to the substrate. This intermediary approach enables the deposition process to occur at low substrate temperatures
3Temperature
If plasma-enhanced CVD is used to reduce substrate temperature, then deposition can occur at lower temperature, but conformal deposition quality deteriorates and substrate damage occurs
Solution Approach 1:
The patent segments the heating function from the substrate by heating the shower head. This approach achieves low substrate temperature deposition while maintaining conformal quality by using controlled thermal decomposition in the shower head rather than plasma enhancement
Solution Approach 2:
The patent changes the temperature parameter distribution by concentrating heat in the shower head rather than on the substrate. This parameter change enables conformal deposition at low substrate temperatures by altering where the thermal energy is applied in the system
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
Enables the deposition of high-quality dielectric thin films with excellent structural and electrical properties on flexible polymer substrates without thermal denaturation, achieving high dielectric constants and low dissipation factors, while maintaining the substrate at a temperature that prevents damage.
Implementation Method 1
heating source vapor, which is vaporized by an evaporator, in a shower head in a reaction chamber so that the source vapor is thermally decomposed to be converted into the nano-size single phase
Implementation Method 2
source vapor, which is vaporized by an evaporator
Implementation Method 3
depositing the source vapor in the nano-size single phase on the flexible polymer substrate
Data Source
AI summary
A method to deposit a thin film on a flexible polymer substrate at room temperature comprising heating source vapor, which is vaporized by an evaporator, in a shower head in a reaction chamber so that the source vapor is thermally decomposed to be converted into the nano-size single phase; and depositing the source vapor in the nano-size single phase on the flexible polymer substrate which is not separately heated.