Metal-Seeded Ferroelectric Layer Crystallization in Scaled NCFETs
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Solution Overview
Problem
As semiconductor devices continue to shrink in feature size, challenges arise in integrating more components into smaller areas while maintaining performance, particularly in forming efficient transistors that require precise layer formation and annealing processes to achieve desired crystalline structures and ferroelectric properties.
Innovation Solution
The method involves forming negative capacitance field effect transistors (NCFETs) using ferroelectric materials with a specific annealing process to diffuse metal seeds into a ferroelectric film, followed by crystallization, which helps control grain size and crystalline phase, enabling the formation of a conductive gate stack that enhances transistor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If minimum feature size is reduced to increase integration density, then more components can be integrated into a given area, but manufacturing precision and process control become more difficult
Solution Approach 1:
The patent segments the gate structure into multiple functional layers including a ferroelectric layer with controlled grain size, a barrier layer, and a conductive layer. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall miniaturization, enabling higher integration density without sacrificing manufacturing precision
Solution Approach 2:
The patent changes the crystalline phase parameters of the ferroelectric layer by controlling grain size distribution and crystal orientation. By adjusting these parameters, the device achieves desired electrical properties at smaller feature sizes, resolving the contradiction between miniaturization and manufacturing precision
2Reliability
If annealing temperature is increased to improve crystalline structure, then ferroelectric properties are enhanced, but device reliability may deteriorate due to material degradation
Solution Approach 1:
The patent applies a preliminary low-temperature annealing treatment before the main high-temperature processing steps. This preliminary action prepares the ferroelectric layer by initiating controlled grain growth and reducing defects, which allows subsequent processing to achieve desired ferroelectric properties without requiring excessively high temperatures that would cause material degradation
Solution Approach 2:
The patent creates local quality variations within the ferroelectric layer by controlling grain size distribution, creating regions with different crystalline orientations and properties. This allows the material to achieve enhanced ferroelectric characteristics in specific regions without subjecting the entire structure to extreme conditions that would cause widespread degradation
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 allows for the creation of transistors with improved switching characteristics at lower voltages, increased integration density, and controlled grain size distribution within the ferroelectric layer, addressing the limitations of traditional semiconductor manufacturing.
Implementation Method 1
a specific annealing process to diffuse metal seeds into a ferroelectric film
Implementation Method 2
a specific annealing process to diffuse metal seeds into a ferroelectric film
Implementation Method 3
followed by crystallization, which helps control grain size and crystalline phase
Data Source
AI summary
A semiconductor device and method of manufacture are provided which utilizes metallic seeds to help crystallize a ferroelectric layer. In an embodiment a metal layer and a ferroelectric layer are formed adjacent to each other and then the metal layer is diffused into the ferroelectric layer. Once in place, a crystallization process is performed which utilizes the material of the metal layer as seed crystals.