Titanium Gettering Layer for MIM Device Insulator Protection
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Solution Overview
Problem
The insulating layer in Metal-Insulator-Metal (MIM) devices is prone to undesired reduction due to exposure to hydrogen (H2), which degrades the device's performance, as H2 can be released during process steps or from interlayer dielectric materials during thermal cycles.
Innovation Solution
Incorporating titanium (Ti) gettering layers above and below the insulating layer to capture and immobilize H2, preventing it from reducing the oxide films and thus protecting the insulating layer from degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating layer is exposed to hydrogen during process steps or thermal cycles, then the device can be manufactured, but the insulating layer undergoes undesired reduction leading to performance degradation
Solution Approach 1:
A titanium gettering layer is introduced as an intermediary between the hydrogen source (interlayer dielectric or process environment) and the insulating layer. This gettering layer captures and immobilizes hydrogen atoms, preventing them from reaching and reducing the insulating layer, thus protecting the device performance while allowing normal manufacturing processes to proceed
Solution Approach 2:
The titanium gettering layer creates a protective environment around the insulating layer by actively scavenging hydrogen, effectively establishing a hydrogen-free (inert) zone that prevents reduction reactions. This allows the insulating layer to maintain its oxidized state and electrical properties despite exposure to hydrogen-containing process steps or thermal cycles
2Reliability
If gettering layers are added above and below the insulating layer, then hydrogen reduction is prevented, but device structure becomes more complex
Solution Approach 1:
The titanium gettering layer acts as a sacrificial protective element that is intentionally designed to interact with and consume hydrogen. This disposable-like approach accepts the added structural complexity as a necessary cost to achieve reliable protection of the insulating layer from hydrogen reduction during manufacturing and operation
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 gettering layers effectively prevent the reduction of the insulating layer, thereby maintaining the device's performance and extending its operational lifespan by shielding it from hydrogen-induced degradation.
Implementation Method 1
Incorporating titanium (Ti) gettering layers above and below the insulating layer to capture and immobilize H2
Data Source
AI summary
An electronic device includes a first electrode, a second electrode and an insulating layer between the first and second electrodes, which insulating layer may be susceptible to reduction by H2. A gettering layer is provided on and in contact with the first electrode, the gettering layer acting as a protective layer for substantially avoiding reduction of the insulating layer by capturing and immobilizing H2. A glue layer may be provided between the gettering layer and first electrode. An additional gettering layer may be provided on and in contact with the second electrode, and a glue layer may be provided between the second electrode and additional gettering layer.