Liquid-Mediated Semiconductor Membrane Transfer for Brittle Large-Area Films
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Solution Overview
Problem
Existing pattern transfer methods face challenges in transferring large-area, device-grade materials like Si, GaAs, and GaN without causing physical damage due to strain mismatch and brittleness, especially when using direct contact or polymeric mediators.
Innovation Solution
A liquid-mediated pattern transfer method where a semiconductor film is delaminated from a substrate in a delamination liquid, allowing a patterned semiconductor membrane to be transferred to a target substrate without direct contact, enabling both front and back-side patterning for multifunctional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct contact transfer or polymeric mediator is used, then pattern transfer is achieved, but large-area brittle materials fracture due to strain mismatch
Solution Approach 1:
The patent introduces a liquid mediator that temporarily replaces solid polymeric mediators or direct contact interfaces. This liquid medium eliminates strain mismatch issues by providing a compliant, strain-free environment during transfer, preventing fracture of brittle large-area materials while enabling complete area transfer
Solution Approach 2:
The patent changes the physical state of the transfer medium from solid (polymer) to liquid, fundamentally altering the mechanical properties of the transfer interface. This parameter change eliminates elastic modulus mismatch and strain accumulation, allowing brittle materials to be transferred intact over large areas
2Manufacturing precision
If conventional lithography is used, then pattern transfer is achieved, but substrate flatness and material compatibility are limited
Solution Approach 1:
The liquid mediator serves as a universal interface that is compatible with diverse materials including flexible substrates, curved surfaces, and various material compositions. This eliminates the flatness requirement of conventional lithography while maintaining pattern transfer accuracy through capillary forces and surface tension
Solution Approach 2:
The liquid-mediated transfer method provides a universal platform that works across multiple material types, substrate geometries, and device configurations. A single transfer protocol can handle rigid and flexible substrates, planar and curved surfaces, enabling broad material compatibility
3Area of stationary object
If polymeric mediator is used for transfer, then pattern transfer is achieved, but the entire pattern size is limited
Solution Approach 1:
The liquid mediator enables transfer of large-area patterns by eliminating the size limitations of polymeric mediators. The liquid can accommodate and transfer patterns spanning entire wafer sizes or larger areas without the mechanical constraints that limit polymeric mediator applications
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 damage-free transfer of large-area, device-grade materials up to 26 cm², facilitating the creation of multifunctional devices with enhanced performance by allowing dual-sided patterning and integration into systems like electronics and optoelectronics.
Implementation Method 1
The substrate is submerged in a delamination liquid, and the semiconductor film is delaminated from the substrate
Implementation Method 2
The substrate is submerged in a delamination liquid, and the semiconductor film is delaminated from the substrate
Implementation Method 3
The patterned semiconductor membrane is transferred to a target substrate in a transfer liquid, and then the transfer liquid is removed
Implementation Method 4
The patterned semiconductor membrane adheres to the target substrate as the transfer liquid is removed
Implementation Method 5
then the transfer liquid is removed (e.g., evaporated)
Data Source
AI summary
A method of liquid-mediated pattern transfer includes providing a substrate comprising (a) a semiconductor film adhered to the substrate and (b) a first patterned layer on the semiconductor film. The substrate is submerged in a delamination liquid, whereby the semiconductor film is delaminated from the substrate while the first patterned layer remains on the semiconductor film. A patterned semiconductor membrane ready for transfer is thus obtained. The patterned semiconductor membrane is transferred to a target substrate in a transfer liquid, and then the transfer liquid is removed (e.g., evaporated). The patterned semiconductor membrane adheres to the target substrate as the transfer liquid is removed.