Semiconductor Metallization via Eutectic Spike Formation
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Solution Overview
Problem
Schottky contacts between semiconductor layers and metallization layers lead to increased leakage currents due to the injection of free charge carriers, limiting the choice of suitable materials and compromising the robustness of semiconductor devices.
Innovation Solution
A method involving the deposition of a first metallization material over a semiconductor body, followed by a heating process to form spike-shaped eutectic regions, and the subsequent deposition of a second metallization material to contact the semiconductor body via these regions, which reduces Schottky barrier effects and enhances material flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallization material with low Schottky barrier is used to avoid increased leakage currents, then leakage current is reduced, but the number of suitable materials is limited
Solution Approach 1:
A first metallization layer is introduced as an intermediary between the semiconductor body and the second metallization layer. This first metallization layer forms a eutectic with the semiconductor material during a heating process, creating spike-shaped regions that penetrate into the semiconductor body. These eutectic regions act as mediators that enable ohmic contact formation, allowing the second metallization layer to contact the semiconductor via the eutectic regions rather than forming a direct Schottky contact. This resolves the contradiction by enabling use of materials that would otherwise form Schottky barriers, since the actual contact path goes through the eutectic regions.
Solution Approach 2:
The invention utilizes the phase transition phenomenon of eutectic formation during a controlled heating process. The first metallization layer and semiconductor material undergo a phase transition to form a eutectic alloy at specific temperatures, creating conductive spike-shaped regions. This phase transition enables the formation of ohmic contacts without requiring the second metallization material to have inherently low Schottky barrier properties, thus resolving the material selection limitation while maintaining low leakage current.
2Device complexity
If a direct metallization-semiconductor interface is formed, then the structure is simple, but Schottky contacts cause increased leakage currents
Solution Approach 1:
The first metallization layer serves as an intermediary that enables controlled eutectic formation with the semiconductor body. During the heating process, this first metallization layer reacts with the semiconductor to form spike-shaped eutectic regions that extend into the semiconductor body. The second metallization layer then contacts the semiconductor through these eutectic regions rather than forming a direct interface. This intermediary approach maintains relatively simple device structure while effectively preventing Schottky contact formation and the associated leakage current issues.
3Reliability
If suitable metallization materials are selected to avoid Schottky barriers, then device robustness is improved, but material choices are limited
Solution Approach 1:
The eutectic regions formed by the first metallization layer act as mediators that decouple the material selection constraints from the final metallization layer. The first metallization layer is specifically chosen to form eutectics with the semiconductor material, while the second metallization layer can be selected from a broader range of materials since it contacts the semiconductor through the eutectic regions rather than forming a direct Schottky contact. This enables maintenance of device robustness through proper eutectic formation while significantly increasing material flexibility for the second metallization layer.
Solution Approach 2:
The invention changes the contact mechanism parameter from direct metallization-semiconductor interface to metallization-eutectic-semiconductor path. By introducing the heating process that creates eutectic phases, the contact parameters are fundamentally altered, enabling use of materials that would otherwise be unsuitable. This parameter change resolves the contradiction between device robustness and material flexibility by transforming how electrical contact is achieved.
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 effectively minimizes leakage currents by forming ohmic contacts through the spike-shaped eutectic regions, allowing for the use of a wider range of materials while maintaining device robustness and heat dissipation capabilities.
Implementation Method 1
performing a heating process so as to form at least one region in the semiconductor body including a eutectic of the first metallization material and material of the semiconductor body
Implementation Method 2
depositing a first metallization material over a semiconductor body
Data Source
AI summary
A method for processing a semiconductor device in accordance with various embodiments may include: depositing a first metallization material over a semiconductor body; performing a heating process so as to form at least one region in the semiconductor body including a eutectic of the first metallization material and material of the semiconductor body; and depositing a second metallization material over the semiconductor body so as to contact the semiconductor body via the at least one region in the semiconductor body.