Semiconductor Device With Segmented Epitaxial Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semiconductor devices face challenges in integrating high-voltage and FinFET devices due to issues such as current leakage and breakdown voltage control as the scale of devices continues to decrease.
Innovation Solution
A method for fabricating semiconductor devices involves providing a substrate with high-voltage and low-voltage regions, forming respective devices with specific gate structures and epitaxial layers, where the high-voltage device features a V-shaped epitaxial layer top surface and the low-voltage device features a planar epitaxial layer top surface, utilizing techniques like selective epitaxial growth and metal gate formation to enhance device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high-voltage devices and FinFET devices are integrated on the same chip, then device functionality and power efficiency are improved, but current leakage and breakdown voltage control become more difficult
Solution Approach 1:
The substrate is divided into distinct high-voltage regions and low-voltage regions with different epitaxial layer structures. HV devices use V-shaped epitaxial layers while LV devices use planar epitaxial layers, allowing each region to be optimized independently for its specific voltage requirements while preventing interference and leakage between regions
Solution Approach 2:
Different epitaxial layer configurations are applied to different regions of the chip: V-shaped epitaxial layers are used specifically in high-voltage regions to handle high breakdown voltages, while planar epitaxial layers are used in low-voltage regions for optimal low-voltage device performance, thereby reducing current leakage at each location
2Area of stationary object
If device scale is reduced to increase integration density, then chip area is reduced, but breakdown voltage control and current leakage become more challenging
Solution Approach 1:
The chip is segmented into high-voltage and low-voltage regions with dedicated epitaxial layer structures for each. This segmentation allows breakdown voltage control to be optimized for each region independently, maintaining precise voltage control even as overall device dimensions are reduced for higher integration density
Solution Approach 2:
The epitaxial layer structure is locally optimized: V-shaped structures in HV regions provide enhanced breakdown voltage control for high-voltage devices, while planar structures in LV regions provide optimal control for low-voltage devices. This local optimization maintains manufacturing precision for breakdown voltage control despite reduced overall device scale
3Reliability
If V-shaped epitaxial layer is used for high-voltage device, then breakdown voltage control is improved, but fabrication complexity increases compared to planar structure
Solution Approach 1:
The fabrication process is segmented to create V-shaped epitaxial layers only in high-voltage regions where they are needed for breakdown voltage control, while low-voltage regions use simpler planar structures. This segmentation improves breakdown voltage control in HV regions without unnecessarily complicating the fabrication of LV regions
Solution Approach 2:
The epitaxial layer geometry is locally adapted: V-shaped structures are implemented only in high-voltage regions to provide enhanced breakdown voltage control where required, while planar structures are used in low-voltage regions to maintain simpler fabrication processes. This local differentiation optimizes breakdown voltage control without uniformly increasing fabrication complexity across the entire chip
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 improves the fabrication process by reducing current leakage and enhancing the control of breakdown voltage, leading to improved performance and efficiency in semiconductor devices.
Implementation Method 1
forming a HV device on the HV region, and forming a LV device on the LV region. Preferably, the HV device includes a first gate structure on the substrate and a first epitaxial layer adjacent to the first gate structure
Data Source
AI summary
A method for fabricating a semiconductor device includes the steps of providing a substrate having a high-voltage (HV) region and a low-voltage (LV) region, forming a HV device on the HV region, and forming a LV device on the LV region. Preferably, the HV device includes a first gate structure on the substrate and a first epitaxial layer adjacent to the first gate structure, in which a top surface of the first epitaxial layer includes a first V-shape. The LV device includes a second gate structure on the substrate and a second epitaxial layer adjacent to the second gate structure, in which a top surface of the second epitaxial layer includes a first planar surface.