Semiconductor Threshold Voltage Tuning with Variable Insulating Stacks
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Solution Overview
Problem
Current semiconductor devices with single threshold voltages have limited applicability and carrier mobility, as they cannot efficiently cater to diverse electronic applications requiring different switching speeds and power consumption levels.
Innovation Solution
A semiconductor device is designed with multiple threshold voltages by incorporating different thicknesses of insulating stacks and conductive layers in each semiconductor unit, allowing for varied threshold voltages and enhanced carrier mobility through the use of stress regions and specific materials like silicon carbide and titanium nitride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single threshold voltage is used in semiconductor devices, then the device structure is simple and manufacturing is easier, but the applicability is limited and carrier mobility is reduced
Solution Approach 1:
The patent applies local quality by creating different threshold voltages in different regions of the semiconductor device through varying insulating stack thicknesses. Specifically, first, second, and third insulating stacks with different thicknesses are formed in different active regions, allowing each region to have optimized electrical characteristics for its specific function while maintaining a unified device structure
Solution Approach 2:
The patent segments the insulating stack structure into multiple variants with different thicknesses within the same device. The insulating stacks are divided into first, second, and third types with progressively different thicknesses, enabling the device to serve multiple electronic applications simultaneously without requiring separate devices for each threshold voltage requirement
2Adaptability or versatility
If insulating stacks of different thicknesses are used to achieve different threshold voltages, then applicability and carrier mobility are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs preliminary action by forming all insulating stacks with different thicknesses during the same manufacturing process sequence. The first, second, and third insulating stacks are concurrently formed using deposition and etching processes, establishing the thickness variations before subsequent processing steps, which simplifies the overall manufacturing workflow while maintaining precise thickness control
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the thickness parameter of insulating stacks to achieve different threshold voltages. The first insulating stack has a first thickness, the second has a second thickness greater than the first, and the third has a third thickness greater than the second, creating a controlled progression of electrical characteristics through deliberate dimensional parameter adjustment
Data Source
AI summary
The present application discloses a method for fabricating a semiconductor device. The method includes providing a substrate and concurrently forming a first semiconductor unit, a second semiconductor unit, and a third semiconductor unit in the substrate. The first semiconductor unit has a first insulating stack, the second semiconductor unit has a second insulating stack, and the third semiconductor unit has a third insulating stack; and thicknesses of the first insulating stack, the second insulating stack, and the third insulating stack are all different.