Pliable Dielectric Transfer Head for Microdevice Handling
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Solution Overview
Problem
Integration and packaging issues, such as device transfer and bonding, hinder the commercialization of micro devices like RF MEMS microswitches, LED display systems, and quartz-based oscillators in traditional transfer methods.
Innovation Solution
A method involving a pliable adhesive layer on a carrier substrate and a transfer head assembly with a pliable dielectric layer, which deforms to level with the devices, allowing for effective grip and transfer without damaging the devices, increasing the successful transfer rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wafer bonding or transfer printing methods are used, then device transfer can be achieved, but device damage occurs and successful transfer rate is reduced due to gap formation between devices and transfer head
Solution Approach 1:
The patent employs a pliable dielectric layer as a flexible film that conforms to the device surface topology. This layer deforms to eliminate gaps between the transfer head and devices, ensuring uniform contact and grip force distribution, thereby preventing device damage and increasing successful transfer rate
Solution Approach 2:
The patent changes the physical parameter of the transfer head surface by using a pliable dielectric layer that can deform elastically. This allows the transfer head to adapt to varying device heights and surfaces, maintaining consistent contact pressure and grip force across all devices in the array
2Stability of the object's composition
If rigid transfer heads are used, then structural stability is maintained, but gap formation between transfer head and devices reduces grip force effectiveness
Solution Approach 1:
The pliable dielectric layer acts as a flexible interface between the rigid transfer head structure and the devices. It provides structural stability through the rigid support substrate while the flexible layer conforms to device surfaces, eliminating gaps and ensuring uniform contact
Solution Approach 2:
The transfer head structure employs asymmetric layering with a rigid support substrate providing stability and a pliable dielectric layer providing conformability. This asymmetric composition allows the system to simultaneously achieve structural stability and contact uniformity
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 method enhances the ability to pick up and place micro devices accurately and securely, reducing damage and increasing process yield by eliminating gaps and absorbing impact forces, thus facilitating the integration of micro devices into receiving substrates.
Implementation Method 1
since the pliable dielectric layer and the pliable adhesive layer deform when the transfer head assembly contacts the devices, the devices are leveled with the transfer head assembly
Implementation Method 2
forming a pliable adhesive layer on a carrier substrate; placing the device over the pliable adhesive layer
Data Source
AI summary
A method for transferring a device includes the following steps: forming a pliable adhesive layer on a carrier substrate; placing the device over the pliable adhesive layer; contacting a transfer head assembly with the device, in which a pliable dielectric layer of the transfer head assembly is in contact with the device during the contacting and more pliable than the device, such that the pliable dielectric layer of the transfer head assembly deforms during the contacting, and the pliable adhesive layer is more pliable than the device, such that the pliable adhesive layer deforms during the contacting; actuating the transfer head assembly to create a grip force; picking up the device by the grip force created by the transfer head assembly; and placing the device onto a receiving substrate.