Fluorine Barrier Film for Semiconductor Threshold Voltage Stability
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Solution Overview
Problem
In semiconductor devices with compound semiconductor multilayer structures, nitrogen defects (dangling bonds) lead to variations in threshold voltage, which are not effectively suppressed by fluorine termination treatment when the surface is exposed to air for an extended period, causing reliability issues.
Innovation Solution
A fluorine-containing barrier film is applied over the surface of the compound semiconductor multilayer structure to terminate dangling bonds and prevent reaction with moisture, ensuring consistent threshold voltage and increased reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine termination treatment is applied to terminate dangling bonds, then threshold voltage variation is suppressed initially, but the effect deteriorates when the surface is exposed to air for an extended period
Solution Approach 1:
The patent applies fluorine termination treatment as a preliminary action to terminate dangling bonds on the compound semiconductor surface before device operation. This preliminary fluorine termination suppresses threshold voltage variation by eliminating electron traps. The treatment is performed in advance during manufacturing, creating a stable surface condition that maintains device performance over time.
Solution Approach 2:
The patent creates an inert environment by forming an insulating film or gate electrode structure that protects the fluorine-terminated surface from exposure to air and moisture. This protective configuration maintains the fluorine termination effect by preventing harmful environmental factors from degrading the surface treatment, thereby extending the duration of the threshold voltage stabilization effect.
2Ease of manufacture
If the surface is exposed to air for a long time after fluorine termination, then device manufacturing and assembly can proceed, but threshold voltage variation increases due to moisture exposure
Solution Approach 1:
The fluorine termination treatment is applied as a preliminary step during the manufacturing process, before the device is exposed to air for extended periods. This timing ensures that the surface is protected from moisture while manufacturing operations are performed, maintaining both ease of manufacture and device reliability.
Solution Approach 2:
The patent introduces an insulating film or gate electrode structure as an intermediary layer that protects the fluorine-terminated compound semiconductor surface from direct exposure to air and moisture. This intermediary configuration allows manufacturing operations to proceed while simultaneously protecting the sensitive surface from environmental degradation.
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 fluorine-containing barrier film effectively maintains the termination of dangling bonds over time, suppressing threshold voltage variations and enhancing the reliability of semiconductor devices by preventing the liberation of fluorine due to moisture exposure.
Implementation Method 1
the dangling bonds are terminated with fluorine in such a manner that a surface of the compound semiconductor multilayer structure is subjected to fluorine termination treatment
Implementation Method 2
a fluorine-containing barrier film that covers a surface of the compound semiconductor multilayer structure... preventing the liberation of fluorine due to moisture exposure
Data Source
AI summary
A semiconductor device includes a compound semiconductor multilayer structure, a fluorine-containing barrier film that covers a surface of the compound semiconductor multilayer structure, and a gate electrode that is arranged over the compound semiconductor multilayer structure with the fluorine-containing barrier film placed the gate and the compound semiconductor multilayer structure.