Thin SiC Semiconductor Layer Transfer for High-Temperature Processing
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Solution Overview
Problem
Existing techniques face challenges in processing relatively thin semiconductor layers, which are difficult to handle and often require expensive materials, leading to production delays and inefficiencies in electronic device fabrication.
Innovation Solution
A process involving bonding a carrier substrate to a donor substrate, generating a laser damage zone, and separating the processing substrate and device portion from the donor substrate along this zone, allowing for the fabrication of thin semiconductor layers that can withstand high-temperature processing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relatively thin layers of semiconductor material are produced from a thick substrate, then material cost is reduced and production efficiency is improved, but the thin layers become difficult to process using typical fabrication processes
Solution Approach 1:
The process segments the semiconductor substrate into a thin device layer and a thick carrier substrate. The thin layer (1-10 micrometers) is separated from the thick substrate through controlled fracture along a pre-formed interface, allowing the thin layer to be processed while the carrier provides mechanical support during fabrication
Solution Approach 2:
A fracture interface is preliminarily formed within the substrate before thinning. This interface is created by implanting ions or applying stress to create a weakened plane, which then guides the separation process to produce a clean thin layer without damage to the device structure
2Reliability
If expensive semiconductor materials are used, then device performance is improved, but production cost increases and material shortages can cause delays
Solution Approach 1:
High-quality semiconductor material is concentrated only where needed - in the thin device layer that becomes the functional component. The bulk of the expensive material is replaced by a cheaper carrier substrate that provides only mechanical support, reducing overall material cost while maintaining device performance
Solution Approach 2:
The functional semiconductor layer is created as a thin copy or replica of the full-thickness substrate, containing only the necessary device structures. This allows using expensive semiconductor material only for the active devices while using inexpensive carrier material for the bulk structure
3Productivity
If thin semiconductor layers are produced, then material usage is optimized and production efficiency is improved, but the layers lack structural integrity to withstand high-temperature processing
Solution Approach 1:
The carrier substrate acts as an intermediary that provides mechanical strength and thermal stability during processing. It supports the thin semiconductor layer through high-temperature fabrication steps, preventing warping, cracking, or deformation that would occur if the thin layer were processed alone
4Device complexity
If typical fabrication processes are used on thin layers, then process simplicity is maintained, but the thin layers cannot withstand the processing conditions
Solution Approach 1:
The carrier substrate provides multiple functions simultaneously: it serves as a mechanical support for the thin layer, a thermal management substrate during processing, and a handling platform throughout fabrication. This allows standard fabrication processes to be used without modification while improving rather than worsening process compatibility
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 production of thin semiconductor layers suitable for electronic devices, using cost-effective materials like SiC, while maintaining structural integrity and facilitating high-temperature processing without damage.
Implementation Method 1
generating a laser damage zone within the donor substrate
Data Source
AI summary
In an aspect, a process can include bonding a carrier substrate to a first major surface of a donor substrate; generating a laser damage zone within the donor substrate; bonding a processing substrate to a second major surface of the donor substrate, wherein the second major surface is opposite the first major surface; and separating (1) the processing substrate and a device portion of the donor substrate and (2) the carrier substrate and a remaining portion of the donor substrate from each other. In another aspect, an electronic device can include a device portion of a SiC substrate, wherein the device portion includes at least part of an electronic circuit element. A processing substrate can be bonded the device portion, wherein the processing substrate can withstand processing conditions when fabricating the electronic device.