GaN Semiconductor Surface Structuring Without Etching Masks
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Solution Overview
Problem
Existing methods for structuring semiconductor surfaces are inefficient and lack control, particularly in the use of wet-chemical etching which results in uncontrolled and random roughening, and require the use of costly etching masks and ion bombardment.
Innovation Solution
A method involving irradiation of the semiconductor surface with an electron beam to create targeted, irradiated sections that reduce the etching rate during wet-chemical etching, allowing for controlled structuring without the need for etching masks and minimizing surface removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet-chemical etching is used to structure semiconductor surfaces, then the etching process can be performed without ion bombardment, but the etching rate is uncontrolled and random roughening occurs
Solution Approach 1:
The semiconductor surface is irradiated with an electron beam before the wet-chemical etching process to create a modified surface layer. This preliminary action prepares the surface by creating regions with different etching rates, allowing subsequent controlled structuring during the etching process without requiring masks or ion bombardment.
2Manufacturing precision
If conventional structuring methods are used, then structures can be produced on the semiconductor surface, but costly etching masks are required
Solution Approach 1:
The electron beam irradiation directly modifies the semiconductor surface to create patterns without requiring external masks. The irradiated regions self-organize into structures with different etching rates during wet-chemical etching, eliminating the need for mask materials and simplifying the overall manufacturing process.
3Manufacturing precision
If conventional structuring methods are used, then structures can be formed, but extensive surface removal occurs
Solution Approach 1:
The electron beam irradiation creates localized modifications on the semiconductor surface, producing regions with different etching rates without removing material. During wet-chemical etching, only selective regions are etched at different rates, preserving the overall surface integrity while forming the desired structures with minimal material loss.
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
This approach enables reproducible and cost-effective structuring of semiconductor surfaces with accentuated structures, reducing random roughening and eliminating the need for expensive etching masks and extensive surface removal, while maintaining the advantages of wet-chemical etching processes.
Implementation Method 1
irradiating the semiconductor surface with an electron beam in order to produce an irradiated section
Implementation Method 2
During the irradiation of the semiconductor surface with an electron beam, an interaction between the electrons of the electron beam and the semiconductor surface can occur. Interaction can be understood to mean, for example, scattering of the electrons at the surface and/or trapping of the electrons in the semiconductor layer and/or activation of point defects by the influence of the electrons.
Implementation Method 3
wet-chemical etching of the semiconductor surface, wherein the etching rate in the irradiated section is less than that in an unirradiated section of the semiconductor surface
Data Source
AI summary
In an embodiment a method for structuring a semiconductor surface includes providing the semiconductor surface, wherein the semiconductor surface is part of a GaN-semiconductor layer, irradiating the semiconductor surface with an electron beam in order to produce an irradiated section and anisotropic wet-chemical etching of the semiconductor surface, wherein an etching rate in the irradiated section is less than that in an unirradiated section of the semiconductor surface, and wherein no etching mask is applied to the semiconductor surface before anisotropic wet-chemical etching.