Gate Stack Halogen Source Layer for Interface Defect Repair
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Solution Overview
Problem
The challenge in semiconductor manufacturing lies in forming reliable devices at increasingly smaller sizes, as feature sizes decrease, making fabrication processes more complex and difficult, affecting the reliability and performance of semiconductor devices.
Innovation Solution
Incorporating a halogen source layer between the gate dielectric layer and the work function layer, which provides halogen elements to repair defects such as dangling bonds at the interface, improving carrier mobility and device reliability by diffusing through the gate dielectric and interfacial layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feature sizes continue to decrease to increase functional density, then production efficiency improves and costs decrease, but fabrication process complexity increases and manufacturing reliability deteriorates
Solution Approach 1:
The halogen source layer is formed in advance before the gate dielectric layer, so that halogen elements are already present to repair interface defects during subsequent processing steps. This preliminary placement of repair agents ensures that as feature sizes decrease and interface quality becomes more critical, the defects are automatically corrected without requiring additional complex processing steps, thereby maintaining manufacturing reliability while enabling continued scaling for higher productivity
Solution Approach 2:
The halogen source layer acts as an intermediary between the gate dielectric layer and the semiconductor fin surface. It provides halogen elements that diffuse through the gate dielectric to repair dangling bonds and interface defects. This intermediary layer mediates the interface quality issue that becomes increasingly problematic as feature sizes decrease, allowing continued scaling without sacrificing manufacturing reliability
2Area of stationary object
If feature sizes decrease to increase functional density, then more devices fit per chip area, but fabrication processes become more difficult and device reliability decreases
Solution Approach 1:
By forming the halogen source layer beforehand, the system proactively addresses interface quality issues that become more severe at smaller feature sizes. This allows higher device density on chip area without compromising individual device reliability, as each scaled device benefits from the pre-positioned halogen repair mechanism
Solution Approach 2:
The halogen source layer provides localized quality improvement at the critical gate dielectric-semiconductor interface. Rather than requiring overall process changes, this local intervention specifically targets interface defects that become more prevalent as feature sizes decrease, enabling higher device density while maintaining reliability
3Ease of manufacture
If conventional gate stack structures are used at smaller sizes, then manufacturing is simpler, but interface defects increase and carrier mobility decreases
Solution Approach 1:
The halogen source layer is formed in advance using standard deposition techniques, maintaining manufacturing simplicity. Subsequently, halogen elements diffuse during normal processing to repair interface defects. This approach improves interface quality without adding significant manufacturing complexity, as the repair mechanism is activated by existing process steps rather than requiring new equipment or procedures
Solution Approach 2:
The halogen source layer enables self-service repair of interface defects. During subsequent thermal processing steps, halogen elements automatically diffuse to repair dangling bonds and improve interface quality. This self-healing mechanism maintains manufacturing simplicity while significantly improving interface quality and carrier mobility at scaled dimensions
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 halogen source layer enhances the performance and reliability of semiconductor devices by repairing defects, leading to improved carrier mobility and stability, even at smaller feature sizes.
Implementation Method 1
provides halogen elements to repair defects such as dangling bonds at the interface, improving carrier mobility and device reliability by diffusing through the gate dielectric and interfacial layers
Data Source
AI summary
Structures and formation methods of a semiconductor device structure are provided. The semiconductor device structure includes a semiconductor substrate and a gate stack over the semiconductor substrate. The gate stack includes a gate dielectric layer and a work function layer. The gate dielectric layer is between the semiconductor substrate and the work function layer. The semiconductor device structure also includes a halogen source layer. The gate dielectric layer is between the semiconductor substrate and the halogen source layer.