Semiconductor Storage Device Insulator Coverage
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Solution Overview
Problem
Current semiconductor storage devices using resistance change elements face challenges in efficiently managing current leakage and reducing the write current required for magnetization reversal, particularly in the design and manufacturing of magnetoresistive effect elements and selectors.
Innovation Solution
The semiconductor storage device incorporates a memory cell array structure with magnetoresistive effect elements and selectors formed by sputtering elements and insulators, where selector members are randomly arranged and covered with insulators to prevent current leakage, and are electrically coupled to the ferromagnetic material in mutually-different constricted paths to reduce the write current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If selector members are arranged in a conventional manner without insulator coverage, then manufacturing process is simpler, but current leakage occurs between adjacent memory cells
Solution Approach 1:
An insulator layer is introduced as an intermediary substance between the conductor-like selector members to prevent harmful current leakage while maintaining the desired electrical connectivity function. The insulator acts as a mediator that blocks parasitic current paths between adjacent memory cells without interfering with the primary selector function.
Solution Approach 2:
The insulator coverage is applied in advance to prevent current leakage before it can occur during device operation. By pre-coating the selector members with insulator material, the design proactively counteracts the potential harmful effect of current leakage between adjacent cells.
2Manufacturing precision
If etching process is used to form selectors, then manufacturing precision can be achieved, but thickness restrictions and process complexity increase
Solution Approach 1:
The mechanical etching process is replaced with a deposition-based formation method. Instead of removing material through etching to define selector structures, the invention forms selectors through controlled deposition of conductive material, eliminating the need for complex etching processes while achieving precise geometric definition.
Solution Approach 2:
The formation of selectors and insulators is merged into a single manufacturing step where both materials are deposited simultaneously or in sequence without requiring separate etching processes. This integration simplifies the overall manufacturing flow while maintaining precision.
3Reliability
If write current is increased to ensure reliable magnetization reversal, then data writing reliability improves, but energy consumption increases
Solution Approach 1:
The current path is locally optimized through constricted geometry that concentrates the write current into a focused path through the magnetoresistive effect element. This local quality enhancement ensures that the current is efficiently directed where needed for magnetization reversal, achieving reliable switching at lower overall current levels.
Solution Approach 2:
The current path is designed with a constricted three-dimensional geometry that funnels current through a narrower effective cross-section. This dimensional optimization increases current density in the critical region, enabling effective magnetization reversal with lower total current and reduced energy 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 configuration effectively suppresses current leakage and reduces the amount of write current needed for magnetization reversal, improving the efficiency and manufacturing process by allowing separate formation of selectors without etching, thus mitigating thickness restrictions and enhancing data storage capabilities.
Implementation Method 1
an insulator which covers at least one of an upper surface or a lower surface of the non-active member, a side surface of the non-active member, a side surface of the switching element of the first memory cell, and a side surface of the switching element of the second memory cell
Implementation Method 2
a first memory cell and a second memory cell, each including a switching element and a resistance change element coupled to the switching element
Implementation Method 3
selectors formed by sputtering elements and insulators
Data Source
AI summary
According to one embodiment, a semiconductor storage device includes: a first memory cell and a second memory cell, each including a switching element and a resistance change element coupled to the switching element, and the first memory cell and the second memory cell being adjacent to each other; a non-active member having a switching function between the switching element of the first memory cell and the switching element of the second memory cell; and an insulator which covers at least one of an upper surface or a lower surface of the non-active member, a side surface of the non-active member, a side surface of the switching element of the first memory cell, and a side surface of the switching element of the second memory cell.