Low-Temperature Plasma Oxide Layers for Threshold Voltage Control
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Solution Overview
Problem
The integration of smaller semiconductor devices and interconnects requires new materials and processes to improve device performance, particularly in controlling the threshold voltage and preventing thermal damage during manufacturing.
Innovation Solution
A semiconductor device is fabricated using a low-dimensional material (LDM) layer with sublayers transformed into an oxide layer through a plasma treatment at a temperature equivalent to or lower than 80 degrees Celsius, allowing for uniform thickness and improved threshold voltage control, with electrodes disposed over the oxide layer to enhance device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional manufacturing processes are used for shrinking semiconductor devices, then integration density increases, but thermal damage occurs during manufacturing and device performance deteriorates
Solution Approach 1:
The patent changes the temperature parameter from conventional high-temperature processes to low-temperature plasma treatment (below 80°C), enabling device manufacturing without thermal damage while maintaining integration density improvements
Solution Approach 2:
The patent replaces thermal processing mechanisms with plasma treatment mechanisms, using reactive species and ion bombardment instead of heat to achieve material transformation and device fabrication
2Reliability
If new materials and processes are adopted to prevent thermal damage, then device performance improves, but manufacturing complexity increases
Solution Approach 1:
The plasma treatment process serves multiple functions simultaneously: it transforms low-dimensional material into oxide layers, controls threshold voltage, prevents thermal damage, and enables uniform thickness, reducing the need for multiple separate processing steps
Solution Approach 2:
By adjusting plasma treatment parameters (power, gas composition, treatment time), the process achieves multiple objectives including oxide layer formation, thickness control, and threshold voltage adjustment within a single manufacturing step
3Reliability
If low-dimensional material is used to improve threshold voltage control, then device performance improves, but manufacturing precision is challenging due to uniform thickness requirements
Solution Approach 1:
The patent replaces thermal transformation mechanisms with plasma-based transformation, enabling precise control over oxide layer thickness and uniformity through plasma parameter control rather than temperature control
Solution Approach 2:
The plasma treatment parameters (power density, gas flow rate, treatment duration) are optimized to achieve uniform oxide layer thickness across the low-dimensional material surface, enabling precise threshold voltage control
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 method results in lower initial leakage current and a positive shift in threshold voltage, leading to better device performance and compatibility with current semiconductor manufacturing processes.
Implementation Method 1
at least one sublayer (monolayer) is transformed into an oxide layer by performing a plasma treatment under a specific process temperature
Implementation Method 2
transformed into an oxide layer by performing a plasma treatment
Data Source
AI summary
A method for manufacturing a semiconductor device is described. The method includes the following steps. A low-dimensional material (LDM) layer is formed on a semiconductor substrate, wherein the LDM layer includes sublayers stacked upon one another. A plasma treatment is performed to the LDM layer to transform at least one sublayer into an oxide layer, wherein the plasma treatment is performed under a temperature equivalent to or lower than about 80 degrees Celsius. At least one electrode is disposed over the oxide layer.