Capacitor Electrode Protection Against Hydrogen Reduction
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Solution Overview
Problem
Semiconductor devices face challenges in preventing conductive metal oxide electrodes from being reduced by hydrogen, which can lead to electrical characteristic deterioration and structural modifications, such as increased leakage current and altered resistance, during the manufacturing process.
Innovation Solution
Incorporating a sacrificial reaction layer with a metal-hydrogen compound, such as titanium-hydrogen or tantalum-hydrogen compounds, as an electrode-protecting layer to prevent hydrogen reduction of the conductive metal oxide electrodes, along with additional layers like buffer, etch stop, and oxidation preventing layers to enhance protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive metal oxide electrode is used in semiconductor devices, then electrical conductivity and functionality are improved, but the electrode is susceptible to reduction by hydrogen during manufacturing, leading to electrical characteristic deterioration and increased leakage current
Solution Approach 1:
A protective layer comprising a metal layer and a metal oxide layer is introduced as an intermediary between the hydrogen environment and the conductive metal oxide electrode. The metal layer (first protective layer) and metal oxide layer (second protective layer) work together to prevent hydrogen from reaching and reducing the electrode, thereby maintaining electrical characteristic stability while allowing the electrode to function properly
Solution Approach 2:
The protective layer is constructed as a composite structure with two distinct layers: a metal layer and a metal oxide layer. This composite material approach provides synergistic protection where the metal layer offers hydrogen barrier properties and the metal oxide layer provides additional protection and interface compatibility with the conductive metal oxide electrode
2Reliability
If the conductive metal oxide electrode is protected from hydrogen reduction, then electrical characteristics are maintained, but additional protective layers increase device structure complexity
Solution Approach 1:
The thicknesses of the metal layer and metal oxide layer are optimized within specific ranges (metal layer: 10-100 nm, metal oxide layer: 1-10 nm) to achieve effective hydrogen protection while minimizing the overall structure complexity. By controlling these dimensional parameters, the protective function is achieved without excessive added complexity to the device 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 sacrificial reaction layer effectively prevents hydrogen-induced reduction of the electrodes, maintaining electrical characteristics and structural integrity, thereby reducing leakage current and preventing structural modifications in semiconductor devices.
Implementation Method 1
the sacrificial reaction layer may include a metal-hydrogen compound
Implementation Method 2
sacrificial reaction layer including a metal-hydrogen compound
Implementation Method 3
an oxidation preventing layer disposed between the upper electrode and the etch stop layer
Data Source
AI summary
The present inventive concept provides semiconductor devices that may include a capacitor including a lower electrode, a dielectric layer, and an upper electrode which are sequentially stacked. An electrode-protecting layer may be provided on the capacitor. The upper electrode may include a conductive metal oxide and the electrode-protecting layer may include a sacrificial reaction layer including a metal-hydrogen compound.