Semiconductor Device Hydrogen Blocking and Bypass Interface Layer
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Solution Overview
Problem
The increasing integration and capacity of semiconductor devices, such as DRAM, require improved capacitance and reduced leak current to enhance refresh characteristics and yield, which existing technologies struggle to achieve effectively due to geometric constraints and hydrogen diffusion issues.
Innovation Solution
Incorporating a hydrogen blocking film and a hydrogen bypass film in the semiconductor device's interface layer, where the hydrogen blocking film, made of insulating material, prevents hydrogen from entering the capacitor, and the hydrogen bypass film, made of conductive material, allows hydrogen to reach transistors, thereby improving electrical characteristics and maintaining refresh cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen blocking film is added to prevent hydrogen from entering capacitor, then capacitor deterioration is prevented, but hydrogen supply to transistors is blocked
Solution Approach 1:
The interface layer is segmented into multiple functional films: a hydrogen blocking film (first hydrogen blocking film) to prevent hydrogen from reaching the capacitor, and a hydrogen bypass film to provide a dedicated pathway for hydrogen to reach the transistor. This segmentation allows simultaneous protection of the capacitor and supply of hydrogen to the transistor.
Solution Approach 2:
The hydrogen bypass film acts as an intermediary element that selectively allows hydrogen to pass through to the transistor while the blocking film prevents hydrogen from reaching the capacitor. The bypass film mediates between the conflicting requirements of hydrogen blocking and hydrogen supply.
2Reliability
If capacitor size is increased to improve capacitance, then refresh characteristics are improved, but device integration density decreases
Solution Approach 1:
The invention changes the material parameters of the interface layer by introducing hydrogen blocking and bypass films with specific hydrogen permeability characteristics. This allows maintaining small capacitor dimensions for high integration density while preventing hydrogen-induced deterioration, thereby preserving refresh characteristics without increasing size.
3Productivity
If design rules are reduced to increase integration, then device capacity increases, but geometric constraints make it difficult to maintain sufficient capacitance
Solution Approach 1:
The interface layer is designed with local quality variations: the hydrogen blocking film is positioned to protect the capacitor region, while the hydrogen bypass film is positioned to supply hydrogen to the transistor region. This localized functional differentiation allows maintaining sufficient capacitance in miniaturized capacitors by preventing hydrogen damage.
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 solution effectively reduces hydrogen supply to capacitors, preventing deterioration while supplying hydrogen to transistors, thus enhancing the semiconductor device's performance and reliability by improving refresh characteristics and data retention.
Implementation Method 1
a hydrogen blocking film, made of insulating material, prevents hydrogen from entering the capacitor
Implementation Method 2
a hydrogen bypass film, made of conductive material, allows hydrogen to reach transistors
Data Source
AI summary
A semiconductor device includes a lower electrode on a substrate, a capacitor dielectric film extending on the lower electrode along a side surface of the lower electrode that is perpendicular to the substrate, an upper electrode on the capacitor dielectric film, an interface layer including a hydrogen blocking film and a hydrogen bypass film on the upper electrode, the hydrogen blocking film including a conductive material, and a contact plug penetrating the interface layer and electrically connected to the upper electrode.