Phase Change Layer Fabrication for Low Power Semiconductor Devices
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Solution Overview
Problem
Semiconductor devices using phase change materials face high power consumption due to the need for large current to generate high-temperature heat, making it difficult to integrate them densely.
Innovation Solution
A method of fabricating a semiconductor device with a phase change layer that includes specific elements with a lower melting point, allowing the process temperature of the thermal treatment process to be lowered below the melting point of the phase change layer, enabling the phase change layer to migrate and fill openings without voids or seams, thereby reducing power consumption and improving integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat energy is used to change the phase of phase change material, then the phase change material can be used to store/read data, but the power consumption of the phase change memory device increases
Solution Approach 1:
The patent modifies the melting point parameter of the phase change material by forming an alloy with lower melting point materials (such as Sb, Te, or their compounds). This parameter change allows the phase change to occur at lower temperatures, thereby reducing the energy required for phase transition and lowering power consumption while maintaining data storage functionality
Solution Approach 2:
The patent uses composite phase change materials consisting of multiple elements (e.g., Ge-Sb-Te alloys) where the combination of materials with different melting points creates a composite structure. This composite approach enables the phase change material to undergo phase transition at lower temperatures compared to pure materials, thus reducing power consumption while preserving the data storage capability
2Reliability
If large current is supplied to generate high-temperature heat, then the phase change material changes phase effectively, but the power consumption increases and integration difficulty increases
Solution Approach 1:
By changing the melting point parameter of the phase change material through alloying with lower melting point elements, the patent enables effective phase change at lower temperatures. This reduces the current required for heating and simplifies the device structure, making high integration more feasible
Solution Approach 2:
The patent replaces the conventional high-current electrical heating mechanism with a thermal treatment process using lower melting point materials. This substitution allows phase change to occur at lower temperatures with reduced current requirements, thereby reducing device complexity and enabling better integration
3Use of energy by moving object
If the process temperature is lowered below the melting point of the phase change layer, then power consumption is reduced, but the phase change layer may not migrate properly to fill openings
Solution Approach 1:
The patent uses composite phase change materials with lower melting point components that enable proper material migration and opening filling at reduced temperatures. The composite structure ensures that even at lower process temperatures, the material maintains sufficient流动性 to migrate and fill openings completely without voids or seams
Solution Approach 2:
By changing the melting point parameter through alloying, the patent ensures that the phase change material remains sufficiently soft and mobile at lower process temperatures to migrate into openings and fill them completely. This parameter modification maintains manufacturing precision while reducing power consumption
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 reduces power consumption and prevents characteristic degradation of the phase change layer, allowing for high integration and efficient operation of semiconductor devices by lowering the process temperature and ensuring seamless filling of openings.
Implementation Method 1
a phase change layer that contains an element that lowers a process temperature of a thermal treatment process to a temperature that is lower than a melting point of the phase change layer. Some embodiments include migrating a portion of the phase change layer from outside the opening, into the opening by the thermal treatment process
Implementation Method 2
a phase change layer that contains an element that lowers a process temperature of a thermal treatment process to a temperature that is lower than a melting point of the phase change layer
Data Source
AI summary
Provided are methods of fabricating a semiconductor device including a phase change layer. Methods may include forming a dielectric layer on a substrate, forming an opening in the dielectric layer and depositing, on the substrate having the opening, a phase change layer that contains an element that lowers a process temperature of a thermal treatment process to a temperature that is lower than a melting point of the phase change layer. Methods may include migrating a portion of the phase change layer from outside the opening, into the opening by the thermal treatment process that includes the process temperature that is lower than the melting point of the phase change layer.