DRAM Insulator Hydrogen Management for Row Hammer Reduction
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Solution Overview
Problem
Current DRAM memory technologies face challenges with the 'row hammer' effect and high refresh times due to the volatility of memory states in ferroelectric capacitors, which can reverse polarization during read operations, necessitating immediate rewriting of memory cells.
Innovation Solution
The method involves forming integrated circuitry with conductive line structures and vias, using insulating materials like silicon carbonitride to manage hydrogen distribution, which reduces the 'row hammer' effect and improves retention times by allowing hydrogen to move into source/drain regions, thereby stabilizing memory states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If ferroelectric capacitors are used to achieve non-volatile memory, then data retention is improved, but the row hammer effect and polarization reversal during read operations increase refresh time requirements
Solution Approach 1:
A hydrogen barrier layer is introduced as an intermediary component between the ferroelectric capacitor and the surrounding environment. This barrier layer prevents hydrogen diffusion into the ferroelectric material, thereby stabilizing the polarization state and reducing the row hammer effect without compromising the non-volatile data retention capability
Solution Approach 2:
The patent modifies the chemical composition and structural parameters of the capacitor insulator material by incorporating specific hydrogen barrier properties. This changes the material's resistance to hydrogen diffusion, stabilizing the ferroelectric polarization state and reducing refresh operations while maintaining long data retention
2Manufacturing precision
If hydrogen barrier layers are added to stabilize memory states, then manufacturing complexity increases, but manufacturing precision can be improved
Solution Approach 1:
The hydrogen barrier layer is applied locally only where hydrogen diffusion is most critical - at the interfaces and regions surrounding the ferroelectric capacitor. This localized approach provides the necessary manufacturing precision for stabilizing memory states while minimizing the overall increase in manufacturing complexity compared to a complete structural redesign
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 approach enhances the stability of memory states, reduces the 'row hammer' effect, and decreases refresh times in DRAM, improving overall memory retention and performance.
Implementation Method 1
allowing hydrogen to move into source/drain regions, thereby stabilizing memory states
Data Source
AI summary
A method used in forming integrated circuitry comprises forming conductive line structures having conductive vias laterally between and spaced longitudinally along immediately-adjacent of the conductive line structures. First insulating material is formed laterally between immediately-adjacent of the conductive vias. Second insulating material is formed directly above the first insulating material and directly above the conductive vias. The second insulating material comprises silicon, carbon, nitrogen, and hydrogen. A third material is formed directly above the second insulating material. The third material and the second insulating material comprise different compositions relative one another. The third material is removed from being directly above the second insulating material and the thickness of the second insulating material is reduced thereafter. A fourth insulating material is formed directly above the second insulating material of reduced thickness. A plurality of electronic components is formed above the fourth insulating material and that individually are directly electrically coupled to individual of the conductive vias through the fourth and second insulating materials. Other embodiments, including structure, are disclosed.