Substitution-Doped Dielectric Thin Films for High-Permittivity Scaling
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Solution Overview
Problem
Current dielectric materials in electronic devices, such as MIM capacitors and MOS transistors, face challenges in miniaturization and performance enhancement due to limitations in permittivity and leakage current, necessitating the development of materials with higher permittivity and lower leakage current characteristics at smaller thicknesses.
Innovation Solution
The introduction of a thin film structure with a dielectric material layer where substitution doping is used to convert paraelectric materials into ferroelectric materials or enhance permittivity by substituting and doping atoms in compounds like SrTiO3 and KTaO3 with atoms of larger radii, such as Ba, Cs, Rb, Zr, Hf, Sn, and Ta, to induce tensile strain and improve dielectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If dielectric material thickness is reduced to achieve miniaturization, then device size is reduced, but permittivity and leakage current characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by substituting atoms in the dielectric material composition (e.g., replacing Sr with Ba, Ti with Zr/Hf/Sn in SrTiO3) to modify the material's intrinsic properties. This changes the permittivity and leakage current characteristics without requiring thickness reduction, thereby maintaining reliability while enabling miniaturization.
Solution Approach 2:
The patent uses composite materials by creating doped dielectric layers where multiple elements are combined (e.g., Sr1-xLaxTi1-yZryO3, Sr2-xLaxTi4-yZryO12). These composite structures integrate materials with different properties to achieve high permittivity and low leakage current in thin film form, resolving the contradiction between miniaturization and performance.
2Reliability
If conventional dielectric materials are used, then material simplicity is maintained, but permittivity is insufficient for high-performance devices
Solution Approach 1:
The patent modifies material parameters through controlled substitution doping where specific atoms are replaced at defined concentrations (e.g., La substituting Sr, Zr/Hf/Sn substituting Ti). This systematic parameter change increases permittivity while maintaining controllable material complexity through defined compositional ranges.
3Reliability
If substitution doping is performed to convert paraelectric to ferroelectric material, then dielectric constant is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent achieves phase transition from paraelectric to ferroelectric by controlling substitution doping parameters (type and concentration of dopants). This parameter-based approach enables material property conversion through composition control rather than complex processing steps, improving dielectric constant while managing manufacturing complexity.
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 effectively increases the permittivity and converts paraelectric materials to ferroelectric materials, enabling the creation of high-performance electronic devices with improved memory capabilities and capacitors, such as ferroelectric memory devices and dynamic random access memory (DRAM) devices.
Implementation Method 1
at least one of A and B in ABO3 is substituted and doped with another atom having a larger atom radius
Implementation Method 2
A tensile strain may be induced through substitution and doping such that the dielectric material layer converts a paraelectric material to a ferroelectric material
Implementation Method 3
at least one of A and B in ABO3 is substituted and doped with another atom having a larger atom radius, and ABO3 becomes A1-xA′xB1-yB′yO3
Implementation Method 4
improves a dielectric constant
Data Source
AI summary
A thin film structure including a dielectric material layer and an electronic device to which the thin film structure is applied are provided. The dielectric material layer includes a compound expressed by ABO3, wherein at least one of A and B in ABO3 is substituted and doped with another atom having a larger atom radius, and ABO3 becomes A1-xA′xB1-yB′yO3 (where x>=0, y>=0, at least one of x and y≠0, a dopant A′ has an atom radius greater than A and/or a dopant B′ has an atom radius greater than B) through substitution and doping. A dielectric material property of the dielectric material layer varies according to a type of a substituted and doped dopant and a substitution doping concentration.