Phase Change Memory Cell Spacer Self-Aligned Fabrication
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Solution Overview
Problem
Manufacturing conventional phase change material memory cells faces challenges in achieving proper and reproducible quality due to the difficulty in controlling the patterning process, which alters the properties of the phase change material.
Innovation Solution
A self-aligned process is employed using a spacer element to form a phase change memory cell without direct patterning of the active part, ensuring the properties of the phase change material remain intact, involving the formation of a dielectric bridge between electrodes and depositing phase change material on it, thereby avoiding the need for complex lithography and etching procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional patterning process is used to manufacture phase change material memory cells, then the memory cells can be manufactured, but the properties of the phase change material are altered and quality is inconsistent
Solution Approach 1:
The patent segments the manufacturing process into two distinct parts: (1) patterning the spacer element structure first, and (2) subsequently forming the phase change material layer. This segmentation allows the spacer to be patterned using standard lithography while the phase change material is deposited conformally, avoiding direct patterning of the sensitive phase change material and thus preserving its properties while ensuring consistent quality.
Solution Approach 2:
The spacer element is formed and patterned in advance before the phase change material is deposited. This preliminary action creates a pre-defined structural framework that guides the subsequent phase change material formation, ensuring that the phase change material is placed precisely where needed without undergoing harsh patterning processes that would alter its properties.
2Shape
If direct patterning of phase change material is performed, then the memory cell structure is defined, but the properties of the phase change material are altered
Solution Approach 1:
The spacer element serves as an intermediary structure that enables structural definition without directly patterning the phase change material. The spacer is patterned first and then used as a template or mold, allowing the phase change material to be formed conformally over it. This intermediary approach achieves precise structural definition while protecting the phase change material from the harmful effects of direct patterning.
Solution Approach 2:
Instead of the conventional approach of directly patterning the phase change material layer, the patent inverts the sequence by first patterning the spacer element and then forming the phase change material conformally over the patterned spacer. This inversion of the manufacturing sequence achieves the desired structural definition while preserving the phase change material properties.
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 ensures reliable and constant quality of phase change memory cells with defined properties, preventing alterations during fabrication and promoting better memory performance by maintaining the integrity of the phase change material.
Implementation Method 1
a spacer element connected between the first electrode and the second electrode and adapted for spacing the convertible structure with regard to a surface of the substrate
Implementation Method 2
phase change materials may be used for storing information. The operational principle of these materials is a change of phase. In a crystalline phase, the material structure is—and thus properties are—different from the properties in the amorphous phase
Implementation Method 3
The increase in temperature may be obtained by applying a pulse to the memory cell. A high current density caused by the pulse may lead to a local temperature increase
Data Source
AI summary
An electronic device (100), the electronic device (100) comprises a substrate (101), a first electrode (102) formed at least partially on the substrate (101), a second electrode (103) formed at least partially on the substrate (101), a convertible structure (104) connected between the first electrode (102) and the second electrode (103), and a spacer element (105) connected between the first electrode (102) and the second electrode (103) and adapted for spacing the convertible structure (104) with regard to a surface of the substrate (101).