Photonic Waveguide for Dynamic Threshold Voltage Control
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Solution Overview
Problem
The challenge in building smaller and faster semiconductor devices is the trade-off between high leakage current and slower operation, where devices with lower leakage current are slower and consume more power, and controlling device characteristics like threshold voltage is difficult due to statistical variations and manufacturing inaccuracies, requiring costly and complex processes for adjustment.
Innovation Solution
The use of a photonic crystal structure integrated into semiconductor devices to alter device characteristics by directing photons to specific locations, adjusting carrier density and trapped charges, allowing for dynamic reconfiguration of device properties post-manufacture to optimize performance and repair damaged devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If devices are made smaller and faster with lower threshold voltages, then speed is improved, but leakage current increases
Solution Approach 1:
The patent applies dynamics by making the threshold voltage adjustable after manufacture through photonic exposure. Devices can dynamically switch between low-threshold (fast) and high-threshold (low leakage) modes depending on operational requirements, resolving the static trade-off between speed and leakage current
Solution Approach 2:
The patent changes the threshold voltage parameter post-manufacture by using photonic exposure to alter trapped charge in the gate dielectric. This allows the same physical device to operate with different threshold voltages, enabling optimization of both speed and leakage current characteristics as needed
2Manufacturing precision
If doping levels are adjusted to control threshold voltage, then device characteristics are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent performs preliminary photonic exposure during or after manufacture to establish the desired threshold voltage characteristics. This preliminary action allows standard manufacturing processes to be used while achieving precise threshold voltage control through subsequent photonic treatment
Solution Approach 2:
The patent replaces the mechanical/chemical doping process with photonic exposure to control threshold voltage. Instead of using multiple dopant additions and masks, light exposure is used to trap or release charges in the gate dielectric, simplifying the manufacturing process while maintaining precision
3Area of moving object
If devices are made smaller, then integration density is improved, but statistical variations in device parameters increase
Solution Approach 1:
The patent uses self-service by allowing photonic exposure to compensate for statistical variations in each individual device. The exposure dose can be locally adjusted to account for variations in channel length, width, or doping, enabling each miniaturized device to be individually tuned to specification
Solution Approach 2:
The patent changes threshold voltage parameters post-manufacture to compensate for statistical variations. By adjusting the photonic exposure dose, devices with slightly different physical dimensions can be tuned to achieve uniform electrical characteristics, offsetting the increased variability inherent in miniaturization
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
This approach enables the adjustment of device characteristics in real-time or during operation, improving circuit functionality, compensating for manufacturing variations, and repairing devices by modifying carrier densities and trapped charges, thus optimizing performance and extending device lifespan.
Implementation Method 1
photons provided to the waveguide structure are directed to one or more devices of the plurality of devices and can alter the device characteristics of the device or devices
Data Source
AI summary
An apparatus comprising an integrated circuit having a plurality of devices each having device characteristics, and a waveguide structure coupled to the integrated circuit, wherein photons provided to the waveguide structure are directed to one or more devices of the plurality of devices and can alter the device characteristics of the device or devices.