Amorphous Hf1-xZrxO2 Gate Insulator for Low-Leakage Scaling
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Solution Overview
Problem
Existing semiconductor devices face challenges with scaling limitations and increasing power consumption, particularly due to the use of crystalline ferroelectric materials that lead to higher leakage currents and reduced capacitance.
Innovation Solution
Employing an amorphous Hf1-xZrxO2 (0≤x≤1) layer with a specific d-orbital energy difference (3.5 eV<ΔE<3.8 eV) as a gate insulating layer, which reduces leakage current and enhances negative capacitance effects by utilizing ordered dipole clusters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If crystalline ferroelectric materials are used as gate insulating layers, then capacitance is improved, but leakage current increases and power consumption increases
Solution Approach 1:
The patent changes the physical state parameter of the Hf1-xZrxO2 material from crystalline to amorphous phase. This parameter change fundamentally alters the material's electrical properties, achieving low leakage current characteristics while maintaining sufficient capacitance through the negative capacitance effect, thereby resolving the contradiction between capacitance and leakage current.
Solution Approach 2:
The patent uses a composite structure combining amorphous Hf1-xZrxO2 thin film with specific dopants (such as Al, Si, Y, La, or Gd) and interfaces with channel layers and gate electrodes. This composite approach enables the material to achieve both low leakage current and high capacitance by leveraging the synergistic effects of the amorphous phase and dopant elements.
2Productivity
If device scaling is continued, then integration density is improved, but power consumption increases and performance deteriorates
Solution Approach 1:
The patent employs parameter changes in the gate insulating layer material (using amorphous Hf1-xZrxO2 with specific composition ratios and thicknesses) to achieve negative capacitance effects. This enables ultra-low power operation in scaled devices by reducing the energy required for switching, thus allowing continued scaling without proportional increases in power consumption.
3Productivity
If device scaling is continued, then integration density is improved, but leakage current increases
Solution Approach 1:
The patent changes the material phase from crystalline to amorphous and optimizes composition parameters of Hf1-xZrxO2 to achieve inherently low leakage current characteristics. The amorphous phase structure eliminates grain boundaries that cause leakage in crystalline materials, enabling high integration density with controlled leakage current.
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 amorphous Hf1-xZrxO2 layer achieves lower power consumption and improved scalability by minimizing leakage current and maximizing capacitance, outperforming crystalline ferroelectric materials.
Implementation Method 1
Lower-power semiconductor devices are being developed to improve performance and/or overcome the scaling-down limitations by utilizing the negative capacitance phenomenon of ferroelectric thin films.
Implementation Method 2
Employing an amorphous Hf1-xZrxO2 (0≤x≤1) layer with a specific d-orbital energy difference (3.5 eV<ΔE<3.8 eV) as a gate insulating layer, which reduces leakage current and enhances negative capacitance effects by utilizing ordered dipole clusters.
Data Source
AI summary
Provided are a semiconductor device and an electronic apparatus including the semiconductor device. The semiconductor device includes a substrate on which a channel layer is provided, an amorphous thin film provided above the substrate, and a gate electrode provided above the amorphous thin film. The amorphous thin film includes an amorphous Hf1-xZrxO2 (0≤x≤1) layer, and a difference value ΔE of a d-orbital with respect to Hf or Zr (an energy difference between an eg orbital and a t2g orbital) satisfies 3.5 eV≤ΔE<3.8 eV.