Compressive Layer for Phase Change Memory Void Elimination
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Solution Overview
Problem
Current semiconductor devices, such as DRAM and flash memory, face challenges in achieving high operational speed and nonvolatile characteristics, with phase change memory devices being a promising next-generation solution but requiring a reliable manufacturing process to address material and structural issues.
Innovation Solution
A method for manufacturing a semiconductor device involving the formation of a phase change material pattern with a compressive layer, where the compressive layer is contracted using heat at a temperature higher than its formation temperature, filling voids and compressing the phase change material pattern without evaporating it, using materials like silicon oxide and hafnium nitride, and ensuring the phase change material maintains its composition ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phase change material pattern is formed in a semiconductor device, then nonvolatile characteristics and high operational speed are improved, but voids may form in the structure reducing reliability
Solution Approach 1:
A compressive layer is formed on the phase change material pattern before final processing steps. This preliminary structural preparation allows the compressive layer to subsequently fill voids and compress the phase change material pattern, ensuring uniform density and eliminating defects that would compromise device reliability.
Solution Approach 2:
The compressive layer acts as an intermediary element between the phase change material pattern and the surrounding structure. It transfers compressive force to fill voids within the phase change material pattern, thereby improving manufacturing precision and uniformity without directly modifying the phase change material itself.
2Manufacturing precision
If heat is applied to contract the compressive layer, then voids are filled and phase change material pattern is compressed, but temperature must be controlled to avoid evaporation
Solution Approach 1:
The formation temperature of the compressive layer is specifically controlled to be lower than the evaporation temperature of the phase change material. During subsequent heating to contract the compressive layer, the temperature is maintained below the phase change material's melting point. This parameter control allows void filling and compression while preventing material loss through evaporation.
Solution Approach 2:
The compressive layer provides localized compression to specific regions of the phase change material pattern where voids exist. By applying compressive force selectively to problematic areas through the compressive layer, uniform density is achieved without subjecting the entire structure to extreme temperatures that would cause evaporation.
3Loss of substance
If the compressive layer is formed at low temperature, then phase change material evaporation is prevented, but the compressive layer requires subsequent heating to contract and fill voids
Solution Approach 1:
The compressive layer is formed in advance at a low temperature that prevents phase change material evaporation. This preliminary formation ensures material retention, and the layer remains in place to be contracted later through heating to fill voids and compress the phase change material pattern.
Solution Approach 2:
The compressive layer undergoes a phase transition or thermal contraction when heated to a temperature higher than its formation temperature but below the phase change material's melting point. This controlled phase transition enables the compressive layer to contract and fill voids while the phase change material remains stable and does not evaporate.
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 enhances the reliability of semiconductor devices by eliminating voids and maintaining the phase change material's composition ratio, thereby improving operational speed and nonvolatile characteristics, addressing the limitations of existing technologies.
Implementation Method 1
contracting the compressive layer, wherein the compressive layer is contracted by providing heat to the compressive layer
Implementation Method 2
A crystalline state of a phase change material can be controlled through a condition of a melting process and a cooling process
Data Source
AI summary
A method of manufacturing a semiconductor device includes forming a phase change material pattern on a top surface of an insulating layer including an opening and in the opening, and forming a compressive layer compressing the phase change material pattern on the phase change material pattern.