Nested Contact Structures for Phase-Change Memory
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Solution Overview
Problem
The challenge in semiconductor device fabrication is the large contact areas between data storage elements and switching devices, which hinder the reduction of device size and power consumption.
Innovation Solution
The method involves forming contact structures with minimized interfacial areas by creating molding patterns and insulating layers on a semiconductor substrate, allowing for the formation of conductive and data storage elements with reduced contact areas, thereby minimizing the contact area between data storage elements and switching devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large contact areas are used to couple data storage elements and switching devices, then electrical connection reliability is improved, but device size and power consumption increase
Solution Approach 1:
The contact structure is formed by nesting multiple layers: the first molding pattern is formed on the substrate, then an insulating layer is deposited over it, followed by a second molding pattern that fills the space between sidewalls. This nested arrangement creates a compact contact structure that maintains electrical connection reliability while minimizing the planar contact area between data storage elements and switching devices.
Solution Approach 2:
The invention transitions from a planar contact structure to a three-dimensional structure by forming molding patterns with sidewalls and filling the space between them with insulating material. This vertical dimensionality change allows the contact to maintain electrical connectivity through the stacked layers while reducing the horizontal footprint, thereby decreasing the contact area between adjacent devices.
2Reliability
If large contact areas are used to couple data storage elements and switching devices, then electrical connection reliability is improved, but power consumption increases
Solution Approach 1:
The nested layered structure of molding patterns and insulating layers creates an efficient electrical pathway that maintains connection reliability while minimizing the contact interface area. The reduced interfacial area between structures directly decreases parasitic capacitance and leakage current, thereby reducing power consumption in phase-change memory devices.
Solution Approach 2:
The invention changes the geometric parameters of the contact structure by forming confined spaces between molding pattern sidewalls rather than using large planar contacts. This parameter change reduces the contact area and interfacial region, which directly lowers the energy required for switching operations and reduces overall power consumption.
3Ease of manufacture
If conventional contact structures are used, then manufacturing simplicity is maintained, but device scaling is limited
Solution Approach 1:
The contact structure is segmented into distinct functional layers: a first molding pattern layer, an insulating layer deposited over it, and a second molding pattern filling the inter-sidewall space. This segmentation allows each layer to be formed using standard semiconductor fabrication processes, maintaining manufacturing simplicity while achieving compact dimensions suitable for device scaling.
Solution Approach 2:
The first molding pattern is formed in advance on the substrate before subsequent layers are deposited. This preliminary action establishes the foundational structure that guides the formation of the insulating layer and second molding pattern, enabling a systematic fabrication approach that maintains ease of manufacture while achieving reduced device size.
Data Source
AI summary
Provided are methods of forming contact structures and semiconductor devices fabricated using the contact structures. The formation of a contact structure can include forming a first molding pattern on a substrate, forming an insulating layer to cover at least a sidewall of the first molding pattern, forming a second molding pattern to cover a sidewall of the insulating layer and spaced apart from the first molding pattern, removing a portion of the insulating layer between the first and second molding patterns to form a hole, and forming an insulating pattern between the first and second molding patterns, and forming a contact pattern in the hole.