High-k Gate Dielectric Crystallization for Uniform Grain Size
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Solution Overview
Problem
As semiconductor devices continue to shrink in size, challenges arise in maintaining process stability and achieving uniform grain size control in gate dielectric layers, which affects the integration density and performance of electronic components.
Innovation Solution
The formation of a template layer to control the grain size of gate dielectric layers, combined with a crystallization process such as soak or spike anneal, ensures uniformity and stability, using high-k gate dielectric layers with sub-nm grain sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If minimum feature size is reduced to improve integration density, then more components can be integrated into a given area, but process stability and grain size uniformity deteriorate
Solution Approach 1:
A template layer is formed prior to depositing the gate dielectric layer to pre-establish a grain structure framework. This preliminary action enables subsequent gate dielectric deposition to follow the template's grain patterns, ensuring uniform grain size even as feature dimensions are reduced for higher integration density.
Solution Approach 2:
The patent employs crystallization processes (soak anneal or spike anneal) to change the physical state and grain structure parameters of the gate dielectric layer. By controlling annealing temperature and duration, uniform sub-10nm grain sizes are achieved, maintaining process stability despite continued scaling of minimum feature sizes.
2Productivity
If minimum feature size is reduced to improve integration density, then more components can be integrated into a given area, but grain size uniformity deteriorates
Solution Approach 1:
The template layer is deposited and processed before the gate dielectric layer to pre-establish a grain size framework. This preliminary grain structure serves as a template that guides the formation of uniform grains in the subsequent gate dielectric, ensuring consistent grain size across the wafer even at reduced feature dimensions.
Solution Approach 2:
Crystallization processes induce phase transitions in the gate dielectric material, transforming it from an amorphous or nanocrystalline state to a controlled crystalline structure with uniform grain sizes. The soak anneal or spike anneal processes facilitate this phase transition, achieving sub-10nm grain uniformity required for high-density integration.
3Manufacturing precision
If template layer and crystallization process are used to control grain size and improve process stability, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The template layer acts as an intermediary between the substrate and the gate dielectric layer. It mediates the grain formation process by providing a pre-established grain structure that the gate dielectric follows during deposition and crystallization, simplifying the overall control of grain size despite the additional process step.
Solution Approach 2:
By controlling the crystallization parameters (temperature, time, atmosphere) of the template layer and subsequent gate dielectric, the process achieves precise grain size control. The standardized annealing protocols (soak or spike) transform complex material science challenges into controllable process parameters, managing device complexity through parameter optimization.
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 enhances process stability and scalability, improving the integration density and performance of nano-FETs by controlling the grain size and crystalline phase of gate dielectric layers.
Implementation Method 1
the gate dielectric layer is a crystalline layer
Implementation Method 2
crystallization process such as soak or spike anneal
Data Source
AI summary
An embodiment includes a device including a first high-k gate dielectric on a first channel region of a first semiconductor feature, the first high-k gate dielectric being a crystalline layer with a grain size in a range of 10 Å to 200 Å. The device also includes a first gate electrode on the first high-k gate dielectric. The device also includes a source region and a drain region on opposite sides of the first gate electrode.