SiGe Channel Devices with Hybrid Substrate Threshold Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for manufacturing multiple threshold voltage devices are overly complex due to the need for extensive process steps, including channel doping and work function tuning, which complicates integration in system-on-chip applications.
Innovation Solution
A method involving a single epitaxy step on a hybrid orientation substrate with different crystallographic orientations to form layers with varying compositions, allowing for the creation of multiple threshold voltage devices without the need for masking or doping, thereby simplifying the processing and achieving multiple threshold voltages through controlled SiGe growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional integration schemes are used to enable multiple Vt devices, then different threshold voltages can be achieved, but process complexity becomes enormous
Solution Approach 1:
The substrate is divided into different crystallographic orientation regions (e.g., <100> and <110> regions) that can be processed simultaneously in a single epitaxy step, enabling multiple device types with different threshold voltages without requiring separate processing lines or sequential steps
Solution Approach 2:
A single epitaxy process is designed to perform multiple functions: forming channels, adjusting threshold voltages, and creating different device characteristics all in one step by utilizing the substrate's hybrid orientation regions, eliminating the need for separate doping and work function tuning processes
2Adaptability or versatility
If channel doping and work function tuning are used to achieve different threshold voltages, then multiple Vt devices can be manufactured, but the number of process steps increases significantly
Solution Approach 1:
Multiple previously separate processes (channel formation, doping, work function tuning) are merged into a single epitaxy step that simultaneously creates channels with different threshold voltages by exploiting the substrate's hybrid crystallographic orientations, reducing processing time and steps
Solution Approach 2:
The hybrid orientation substrate itself provides the mechanism for threshold voltage differentiation through its inherent crystallographic properties, eliminating the need for external doping and work function tuning processes to achieve multiple Vt values
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 reduces process complexity by integrating multiple threshold voltage devices with fewer epitaxy steps, enabling efficient modulation of threshold voltages and simplifying the manufacturing process, which is applicable in various electronic systems.
Implementation Method 1
performing a single epitaxy step on a hybrid orientation substrate including a first region having a first crystallographic orientation and a second region having a second crystallographic orientation different from the first crystallographic orientation, wherein the single epitaxy step forms a first layer disposed on the first region and a second layer disposed on the second region
Data Source
AI summary
Multiple threshold voltage devices on hybrid oriented substrates, and methods of manufacturing same are disclosed. A method for manufacturing a semiconductor device comprises performing a single epitaxy step on a hybrid orientation substrate including a first region having a first crystallographic orientation and a second region having a second crystallographic orientation different from the first crystallographic orientation, wherein the single epitaxy step forms a first layer disposed on the first region and a second layer disposed on the second region, the first layer has the first crystallographic orientation and a first composition, and the second layer has the second crystal orientation and a second composition different from the first composition.