Co-Doped Ferroelectric Transistors for Lower-Voltage Reliability
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Solution Overview
Problem
The scaling down of integrated circuits (ICs) leads to increased complexity and reduced geometry sizes, but challenges persist in maintaining high reliability and efficiency due to defects and high operational voltages in ferroelectric transistors, which affect production costs and product reliability.
Innovation Solution
The use of co-doped ferroelectric materials in the ferroelectric layer of transistors, with cerium and other dopants, reduces the ferroelectric coercive field and enhances polarization, thereby lowering operational voltages and reducing defect generation, improving transistor reliability and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferroelectric materials are used in transistors to maintain functionality as they scale down, then transistor operation is enabled, but high coercive field and polarization instability reduce reliability
Solution Approach 1:
The patent changes the chemical composition parameters of the ferroelectric material by introducing dual dopants (e.g., hafnium and zirconium in oxide matrices) to optimize the material properties. This compositional parameter change reduces the coercive field while stabilizing polarization, directly resolving the contradiction between reliability and polarization stability
Solution Approach 2:
The patent employs composite ferroelectric materials combining multiple elements (e.g., Hf-Zr-O, Pb(Mg3Nb2/3)O3-PbTiO3) to achieve synergistic effects. The composite structure provides both low coercive field for reliable switching and high polarization stability, simultaneously addressing both requirements
2Productivity
If transistor geometry is scaled down to increase functional density, then production efficiency increases, but maintaining high reliability becomes difficult
Solution Approach 1:
The patent modifies material parameters (composition, crystal structure) to maintain ferroelectric properties at scaled dimensions. The dual-doped ferroelectric materials retain stable polarization and reduced coercive field even in miniaturized transistors, enabling continued scaling while preserving reliability
Solution Approach 2:
The patent applies specific dopant configurations and material compositions tailored to the local requirements of scaled transistor structures. The ferroelectric layer composition is optimized for thin-film applications in miniaturized devices, ensuring reliable operation at smaller geometries
3Use of energy by moving object
If operational voltage is reduced to lower power consumption, then energy efficiency improves, but transistor performance may deteriorate
Solution Approach 1:
The patent changes the ferroelectric material parameters to achieve low coercive field values, which directly enables reduced operational voltage. The dual-doped compositions provide sufficient polarization switching at lower electric fields, allowing voltage reduction while maintaining transistor switching performance and avoiding power deterioration
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 results in a significant reduction in operational voltage by up to 70% and enhances the lifespan of transistors by at least 1000 times compared to non-doped devices, while maintaining performance and reducing defect-related issues.
Implementation Method 1
a material of the ferroelectric layer comprises a ferroelectric material doped with a first dopant and a second dopant
Implementation Method 2
the first dopant comprises cerium; and a second electrode layer, wherein the ferroelectric layer is disposed between the first electrode layer and the second electrode layer
Data Source
AI summary
A semiconductor device includes a first electrode layer, a ferroelectric layer, and a second electrode layer. A material of the ferroelectric layer comprises a ferroelectric material doped with a first dopant and a second dopant different from the first dopant, and the first dopant comprises cerium. The ferroelectric layer is disposed between the first electrode layer and the second electrode layer.