Phase Transition Layer Void Removal via Controlled Thermal Diffusion
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Solution Overview
Problem
Fabrication of semiconductor devices with phase transition layers often results in voids and overhangs, which act as defects and affect the electrical resistance and data storage capabilities of phase transition memory devices.
Innovation Solution
A method involving the formation of a mold layer on a substrate with a hole, followed by the deposition of a phase transition layer, and subsequent thermal treatment at specific temperatures to remove voids and overhangs, forming a diffusion layer within the phase transition layer, where the temperatures are controlled to be between 40%-55% of the melting point of the phase transition layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal treatment is performed at high temperature to remove voids and overhangs, then the phase transition layer quality is improved, but the melting point of the phase transition layer is exceeded causing material degradation
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thermal treatment temperature to be below the melting point of the phase transition layer. By adjusting the temperature parameter within a specific range, the method achieves effective removal of voids and overhangs while preventing material degradation that would occur at higher temperatures.
Solution Approach 2:
The patent employs preliminary action by performing thermal treatment at a controlled temperature before any potential melting or degradation occurs. This preliminary thermal processing removes defects (voids and overhangs) in advance, ensuring high-quality phase transition layer formation without reaching dangerous temperature thresholds.
2Ease of manufacture
If the phase transition layer is formed at low temperature, then material deposition is easier, but voids and overhangs remain as defects
Solution Approach 1:
The patent uses preliminary action by forming the phase transition layer at a lower temperature where deposition is easier, then subsequently applying thermal treatment to remove defects. This two-stage approach allows the material to be deposited under favorable conditions first, then refined to remove voids and overhangs in a controlled thermal processing step.
Solution Approach 2:
The patent applies segmentation by dividing the manufacturing process into distinct stages: initial deposition at lower temperature for ease of manufacture, followed by separate thermal treatment at controlled temperature to remove defects. This segmentation allows optimization of each stage independently - easy deposition followed by precision defect removal.
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 effectively removes voids and overhangs from the phase transition layer, enhancing the electrical resistance properties and data storage mechanisms of the semiconductor device, thereby improving the performance and reliability of phase transition memory devices.
Implementation Method 1
thermally treating the phase transition layer comprises heating the substrate to a first temperature to form a diffusion layer in the phase transition layer
Implementation Method 2
thermally treating the phase transition layer comprises heating the substrate to a first temperature to form a diffusion layer in the phase transition layer, wherein the first temperature is lower than or equal to 55% of a melting point of the phase transition layer
Data Source
AI summary
Disclosed is a method of fabricating a semiconductor device. The method may include forming a mold layer on a substrate, the mold layer having a hole exposing a portion of the substrate, forming a phase transition layer with a void, in the hole, and thermally treating the phase transition layer to remove the void from the phase transition layer. The thermal treating of the phase transition layer may include heating the substrate to a first temperature to form a diffusion layer in the phase transition layer, and the first temperature may be lower than or equal to 55% of a melting point of the phase transition layer.