Oxidized Conductive Pattern for Localized Joule Heating in Memory Devices
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Solution Overview
Problem
Current semiconductor devices face challenges in achieving high heating efficiency for resistance memory devices, as existing conductive structures do not effectively provide localized heating.
Innovation Solution
A semiconductor device is designed with a conductive pattern that includes an oxidized portion extending out of an opening and a non-oxidized portion within the opening, where the width of the conductive pattern is determined by the thickness of the barrier layer pattern, and the oxidized portion has a specific thickness and width configuration to enhance heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional conductive structure is used, then the device structure is simple, but the heating efficiency is insufficient
Solution Approach 1:
The conductive pattern is divided into two distinct regions: an oxidized portion with high resistance for localized heating, and a non-oxidized portion with low resistance for current conduction. This local differentiation of material properties enables the structure to simultaneously achieve efficient heating at the target location while maintaining overall electrical conductivity, resolving the contradiction between heating efficiency and structural simplicity.
Solution Approach 2:
The conductive pattern employs a composite structure combining oxidized metal (high resistance) and non-oxidized metal (low resistance) within a single continuous pattern. This composite approach allows the structure to exhibit dual functionality: the oxidized region generates heat through Joule heating while the non-oxidized region provides low-resistance current paths, thereby achieving high heating efficiency without requiring multiple separate components.
2Use of energy by moving object
If the conductive pattern width is increased, then the heating efficiency improves, but the heating localization becomes poor
Solution Approach 1:
By creating an oxidized portion with high resistance within the conductive pattern, the structure achieves concentrated Joule heating at a specific location (the oxidized region) even when the overall pattern width is relatively large. The non-oxidized portions serve as current supply paths without generating excessive heat, thus maintaining heating localization while allowing sufficient current flow through the wider structure.
Solution Approach 2:
The conductive pattern is segmented into functionally distinct oxidized and non-oxidized regions. The oxidized segment acts as the heating element with controlled resistance, while the non-oxidized segments function as current conduits. This segmentation enables the structure to achieve both adequate heating efficiency and spatial localization by separating the heating function from the conduction function within the same physical structure.
3Use of energy by moving object
If the oxidized portion thickness is increased, then the resistance increases for better heating, but the current conduction capability decreases
Solution Approach 1:
The oxidized portion's increased thickness is localized only to the region where heating is desired, while the non-oxidized portions maintain their original thickness and excellent conduction properties. This local thickening of the oxidized layer provides sufficient resistance for efficient Joule heating without compromising the overall current conduction capability of the conductive pattern, as the current can flow through the thinner, highly conductive non-oxidized regions.
Solution Approach 2:
The composite structure of oxidized and non-oxidized portions allows the oxidized region to be optimized for heating (thicker, higher resistance) while the non-oxidized regions are optimized for conduction (thinner, lower resistance). The two regions work together in series, where the non-oxidized portions deliver current to and from the oxidized heating portion, ensuring both adequate heating efficiency and reliable current conduction throughout the structure.
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
The semiconductor device achieves improved heating efficiency by optimizing the dimensions and materials of the conductive pattern, allowing for effective Joule heating in resistance memory devices, such as PRAM and MRAM, thereby enhancing data storage and retrieval processes.
Implementation Method 1
For generating a local heating at the predetermined position of the resistance memory device, the resistance memory device may include a conductive structure serving as a heating electrode
Data Source
AI summary
A semiconductor device includes an interlayer insulating layer disposed on a substrate, the interlayer insulating layer comprising an opening exposing the substrate, a barrier layer pattern disposed within the opening, and a conductive pattern disposed on the barrier layer pattern, the conductive pattern having an oxidized portion extending out of the opening and a non-oxidized portion within the opening, wherein a width of the conductive pattern is determined by a thickness of the barrier layer pattern.