Nozzle-Guided LIFT Component Transfer for Accurate Substrate Positioning
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Solution Overview
Problem
Existing Laser Induced Forward Transfer (LIFT) techniques struggle with controlling the directionality and positioning of small and thin components, leading to uncontrollable propulsion and loss of accuracy, especially when transferring to substrates with varying topography or air gaps.
Innovation Solution
A method involving a blister forming layer on a donor substrate with a predefined nozzle location, created by a pulsed laser beam, allows for controlled release and propulsion of components using a narrow jet, defined by laser beam diameter, indentations, or reinforcing elements, ensuring accurate positioning on a receiver substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DRL is completely vaporized to release the component, then the component is effectively released and propelled towards the receiver substrate, but the control over the component's position becomes very difficult due to uncontrolled gas expansion and transversal drag forces
Solution Approach 1:
The patent pre-defines the nozzle location on the donor substrate before the LIFT process. This preliminary positioning of the gas exit point ensures that the component is propelled along a controlled trajectory towards the receiver substrate, preventing uncontrolled deviation while maintaining effective release through complete DRL vaporization.
Solution Approach 2:
The patent creates a localized nozzle at a specific predefined location rather than allowing uniform gas expansion across the entire DRL area. This local concentration of gas flow through the predefined nozzle provides directional control and reduces transversal drag forces, resolving the contradiction between effective release and positioning accuracy.
2Power
If higher laser power is used to enable complete vaporization of the DRL, then the component release is more effective, but the gas formation becomes more uncontrolled leading to loss of placement accuracy
Solution Approach 1:
The patent extracts the gas expansion process from being uniform across the entire DRL area and channels it through a predefined nozzle location. This extraction allows high laser power to be used for effective DRL vaporization while the nozzle constrains the gas flow to a controlled path, maintaining placement accuracy despite high power input.
3Adaptability or versatility
If the air gap between the component and receiver substrate is increased to accommodate substrate topography variations, then the method can handle varying topography, but the directionality of the transferred component is lost
Solution Approach 1:
The predefined nozzle location on the donor substrate establishes a fixed reference point for gas flow direction before the transfer process. This preliminary directional constraint maintains component trajectory control even when the air gap is increased to accommodate substrate topography variations, preserving both adaptability and directionality.
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
Achieves high-throughput, accurate, and reliable transfer of small components with improved directionality, enabling larger air gaps and consistent placement on substrates with varying topography.
Implementation Method 1
a pulsed laser beam is directed to the back side of the donor substrate, at the location of a component. The laser pulse traverses the transparent donor substrate but not the DRL, the latter being non-transparent to the laser light. The DRL material is chosen such that the laser energy is absorbed by the material, transforming it into a gas at high pressure and temperature
Implementation Method 2
The DRL material is chosen such that the laser energy is absorbed by the material, transforming it into a gas at high pressure and temperature
Implementation Method 3
The DRL material is chosen such that the laser energy is absorbed by the material, transforming it into a gas at high pressure and temperature
Data Source
AI summary
A method for accurately positioning a component on a receiver substrate is provided. The component is transferred from a donor substrate to a receiver substrate facing the donor substrate. The method comprises creating at least one nozzle at a predefined location in the area of contact between a blister forming layer on the donor substrate, and a component attached to the donor substrate by adhesion to the blister forming layer. The blister forming layer comprises at least a dynamic release layer, consisting of a dynamic release material. The application of the laser beam creates a blister that contains vaporized dynamic release material. The blister expands until a nozzle is created, the nozzle allowing the vaporized dynamic release material to exit the blister and cause the release of the component and its propulsion towards the receiver substrate. The nozzle releases the material in the form of a narrow jet of gas.