SOI Substrate Gettering Layer for Leakage and Breakdown Control
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Solution Overview
Problem
Mobile metal contaminants such as sodium and potassium in semiconductor-on-insulator (SOI) substrates induce higher leakage current and reduce breakdown voltage, adversely affecting device performance.
Innovation Solution
Incorporating a getter material with a halogen concentration profile, such as fluorine or chlorine, in the insulator layer to bind and immobilize these contaminants, thereby reducing leakage current and increasing breakdown voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mobile metal contaminants (sodium, potassium) are present in the insulator layer, then the SOI substrate can be manufactured with standard processes, but leakage current increases and breakdown voltage decreases
Solution Approach 1:
The patent introduces a getter material layer during the insulator formation process, before metal contaminants can cause harm. This getter layer is pre-positioned to actively bind and immobilize mobile metal contaminants such as sodium and potassium, preventing them from migrating and causing leakage current or breakdown voltage issues in subsequent device operation.
Solution Approach 2:
The getter material acts as an intermediary substance between the metal contaminants and the insulator layer. It selectively binds to mobile metal ions (sodium, potassium) through chemical affinity, trapping them within the insulator structure and preventing their harmful electrical effects while allowing the standard SOI manufacturing process to continue.
2Reliability
If getter material is added to the insulator layer, then leakage current is reduced and breakdown voltage increases, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the getter material formation with the existing insulator layer deposition process. By introducing the getter material during the same manufacturing step used to form the insulator layer (such as during thermal oxidation or chemical vapor deposition), the process adds minimal complexity while achieving contaminant binding functionality.
Solution Approach 2:
The patent modifies existing process parameters (such as oxidation conditions, deposition temperature, or gas composition) to simultaneously form both the insulator layer and incorporate the getter material. This approach leverages parameter adjustments in standard processes rather than introducing entirely new manufacturing steps, thereby limiting complexity increase.
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 getter material effectively reduces leakage current and enhances breakdown voltage by binding mobile metal contaminants, improving the electrical performance of SOI substrates.
Implementation Method 1
the oxide layer is subjected to a gettering process in which a halogen species is provided in the oxide layer to getter away the metal contaminants
Data Source
AI summary
Various embodiments of the present application are directed towards a semiconductor-on-insulator (SOI) substrate. The SOI substrate includes a handle substrate; a device layer overlying the handle substrate; and an insulator layer separating the handle substrate from the device layer. The insulator layer meets the device layer at a first interface and meets the handle substrate at a second interface. The insulator layer comprises a getter material having a getter concentration profile. The handle substrate contains getter material and has a handle getter concentration profile. The handle getter concentration profile has a peak at the second interface and a gradual decline beneath the second interface until reaching a handle getter concentration.