Anodic Oxide Layer Formation for Semiconductor Reliability
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Solution Overview
Problem
The quality and dimensioning of electrically insulating parts in semiconductor devices limit the maximal allowable voltages and lifetime of semiconductor devices, necessitating improved methods for forming high-quality oxide layers.
Innovation Solution
Anodic oxidation of semiconductor substrates within an electrolyte, generating an attracting electrical field to form oxide layers, followed by reducing remaining oxidizing ions to enhance oxide layer quality, and optionally stimulating oxidation with light or magnetic fields to achieve thicker, higher-quality oxide layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anodic oxidation is carried out to form oxide layers, then the breakdown voltage and lifetime of semiconductor devices are increased, but remaining oxidizing ions within the oxide layer reduce the quality of the insulating parts
Solution Approach 1:
The patent extracts and removes remaining oxidizing ions from the oxide layer through a chemical treatment step after anodic oxidation. This separation allows the oxide layer to maintain both its thickness (for high breakdown voltage) and its purity (for high insulating quality), resolving the contradiction between reliability and manufacturing precision.
2Manufacturing precision
If anodic oxidation is carried out with attracting electrical field, then oxide layers are formed, but the process requires complex control of electrical fields and electrolyte conditions
Solution Approach 1:
The patent employs self-aligned anodic oxidation where the oxide layer formation is automatically controlled by the electrical field distribution and electrolyte concentration gradients. The process self-regulates the oxide thickness and uniformity without requiring complex external control mechanisms, reducing process complexity while maintaining manufacturing precision.
3Reliability
If oxidizing ions are attracted to form oxide layers, then insulating parts are created, but high concentration of remaining ions limits the maximal allowable voltages
Solution Approach 1:
The patent converts the harmful effect of remaining oxidizing ions by introducing a chemical reduction step that transforms these ions into harmless byproducts. This eliminates the voltage-limiting effect of ion concentration while preserving the beneficial insulating properties of the oxide layer, enabling higher maximal allowable voltages.
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 method increases the breakdown voltage and lifetime of semiconductor devices by forming high-quality oxide layers with enhanced thickness and reduced ion concentration, suitable for low-temperature processing and various semiconductor materials.
Implementation Method 1
generating an attracting electrical field between the semiconductor substrate and an external electrode within an electrolyte to attract oxidizing ions of the electrolyte
Implementation Method 2
attract oxidizing ions of the electrolyte causing an oxidation of the surface region
Implementation Method 3
stimulating the anodic oxidation independent from the attracting electrical field
Data Source
AI summary
A method for forming a semiconductor device includes carrying out an anodic oxidation of a surface region of a semiconductor substrate to form an oxide layer at a surface of the semiconductor substrate by generating an attracting electrical field between the semiconductor substrate and an external electrode within an electrolyte to attract oxidizing ions of the electrolyte, causing an oxidation of the surface region of the semiconductor substrate. Further, the method includes reducing the number of remaining oxidizing ions within the oxide layer, while the semiconductor substrate is within an electrolyte.