Pyrochlore Dielectric Layer Low-Temperature Crystallization
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Solution Overview
Problem
Current methods for producing dielectric materials for microelectronics, such as silicon dioxide, have low dielectric constants and high dielectric losses, making it difficult to achieve high capacitance values without compromising device density and integrity, while alternative materials like PZT have high dielectric constants but also high losses, and existing pyrochlore materials require high temperatures that can degrade surrounding components.
Innovation Solution
A process for preparing lead-based oxide ceramic materials with a pyrochlore structure by depositing an amorphous layer on a substrate and annealing at temperatures less than or equal to 550°C, specifically 400-450°C, to achieve a high dielectric constant greater than 40 and a low dielectric dissipation factor less than 0.015, using techniques like magnetron sputtering or sol-gel deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicon dioxide is used as dielectric material, then the manufacturing process is simple and reliable, but the dielectric constant is low (3.9) requiring very high surface area and thin thickness to achieve necessary capacitance values
Solution Approach 1:
The patent changes the material composition parameters by using lead-based oxide ceramic materials with specific compositions (PbNb1-xMgxO3, Pb1-xLaxZr1-yTiyO3, etc.) to achieve a dielectric constant of at least 40, dramatically improving the capacitance density compared to silicon dioxide while maintaining manufacturing feasibility through controlled deposition and crystallization processes
Solution Approach 2:
The patent employs composite ceramic materials combining multiple elements (lead, niobium, magnesium, lanthanum, zirconium, titanium) to create dielectric layers with optimized properties, achieving both high dielectric constant and acceptable manufacturing characteristics through the synergistic effects of different compositional components
2Quantity of substance
If SiO2 layer thickness is reduced to increase capacitance density, then the capacitance per unit area increases, but high tunnel currents appear that are detrimental to circuit functioning
Solution Approach 1:
The patent changes the dielectric material parameters by using ceramic oxide materials with high dielectric constant (≥40), which allows achieving the same capacitance density with thicker layers, thereby eliminating tunnel current issues while maintaining electrical stability and reliability in integrated circuit operation
3Quantity of substance
If perovskite materials like PZT are used to achieve high dielectric constant, then the dielectric constant increases (order of 1000), but the dielectric loss becomes high (0.02-0.05) which is troublesome in microelectronics applications
Solution Approach 1:
The patent optimizes the material composition parameters by using lead-based oxide ceramics with specific stoichiometric ratios and controlled crystallization conditions, achieving a dielectric constant of at least 40 with dielectric loss of 0.015 or less, thus improving upon perovskite materials by reducing energy loss while maintaining high capacitance
Solution Approach 2:
The patent applies local quality control by carefully managing the crystallization process parameters (temperature, atmosphere, duration) to achieve the desired pyrochlore or perovskite phase with optimized local atomic arrangements, resulting in reduced dielectric loss compared to conventional perovskite materials
4Quantity of substance
If existing pyrochlore materials are used, then the dielectric properties improve, but high temperatures are required for preparation that can degrade surrounding components and interconnect metals
Solution Approach 1:
The patent changes the processing temperature parameters by using lead-based oxide ceramic materials that crystallize at lower temperatures (400-550°C) compared to conventional pyrochlore materials, enabling the formation of high-dielectric-constant layers without degrading surrounding integrated circuit components and interconnect metals
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 method allows for the production of dielectric materials with improved dielectric properties, enabling high capacitance without thermal degradation, suitable for integrated circuits and standalone components, with a dielectric strength greater than 800 kV/cm and low heat dissipation, preserving the integrity of interconnect metals.
Implementation Method 1
a crystallization annealing step of said amorphous layer at a temperature less than or equal to 550° C., whereby a lead-based oxide ceramic dielectric material comprising at least one pyrochlore phase is obtained
Implementation Method 2
a crystallization annealing step of said amorphous layer at a temperature less than or equal to 550° C., whereby a lead-based oxide ceramic dielectric material comprising at least one pyrochlore phase is obtained
Implementation Method 3
using techniques like magnetron sputtering or sol-gel deposition
Implementation Method 4
the relative dielectric constant of the dielectric material (conventionally represented by ε r ), which somehow expresses the insulating nature of the material
Data Source
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AI summary
The invention describes a method for preparing a lead-based ceramic oxide dielectric material comprising at least one pyrochlore crystalline phase. The pyrochlore phase is selected from lead niobate, lead magnobiate, and a solid solution resulting from a mixture of lead magnobiate and lead titanate. The method comprises the following successive steps: a) a step of depositing at least one amorphous layer of said lead-based ceramic oxide material onto a substrate; b) a step of crystallizing said amorphous layer at a temperature of 550°C or lower, thereby obtaining a lead-based ceramic oxide dielectric material comprising at least one pyrochlore phase. Application of said method to the fabrication of capacitors on integrated circuits.