Stacked Perovskite Capacitor Structure With Amorphous Leakage Barriers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The capacitor structure in dynamic random access memory (DRAM) exhibits poor performance due to high leakage current caused by the small dielectric constant of the silicon oxide layer between electrodes.
Innovation Solution
A capacitor structure is designed with two electrodes and a dielectric layer comprising stacked perovskite layers, where amorphous layers are inserted between adjacent perovskite layers to suppress electron output, reducing leakage current and enhancing performance. The perovskite layers are made of materials like strontium titanate or barium titanate, and the amorphous layers are made of aluminum oxide or silicon oxide, all formed using deposition processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a silicon oxide dielectric layer is used between electrodes, then the manufacturing process is simple, but the leakage current is high due to small dielectric constant
Solution Approach 1:
The patent applies composite materials by combining perovskite layers with amorphous insulating layers to create a multi-layer dielectric structure. This composite approach achieves both low leakage current (through the electron-blocking amorphous layers) and high dielectric constant (through the perovskite layers), resolving the contradiction between manufacturing simplicity and reliability.
Solution Approach 2:
The patent implements local quality by creating different functional zones within the dielectric layer. The amorphous layers are positioned specifically at interfaces with electrodes to block electron emission, while perovskite layers are placed in intermediate regions to provide high dielectric constant. This spatial differentiation of material properties optimizes both leakage current suppression and capacitive performance.
2Reliability
If the dielectric constant is increased to reduce leakage current, then the leakage current decreases, but the device complexity increases due to multi-layer structure
Solution Approach 1:
The patent applies segmentation by dividing the dielectric layer into multiple functional sub-layers: amorphous insulating layers for electron blocking and perovskite layers for high dielectric constant. This segmentation allows each layer to perform its specific function optimally, achieving low leakage current while maintaining a systematic and manufacturable multi-layer structure.
Solution Approach 2:
The patent uses amorphous insulating layers as intermediary elements between the electrodes and perovskite layers. These intermediary layers serve as electron-blocking barriers that prevent direct contact between electrons and the perovskite material, thereby suppressing leakage current while allowing the perovskite layers to contribute their high dielectric constant properties.
3Reliability
If perovskite layers are stacked to increase dielectric constant, then the dielectric performance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of each layer in the multi-layer dielectric structure. By carefully controlling the thickness parameters of perovskite and amorphous layers, the patent achieves the desired dielectric constant while maintaining manufacturability. The specific thickness ranges are selected to balance dielectric performance with deposition process capabilities.
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 solution significantly reduces leakage current and improves the overall performance of the capacitor structure by utilizing the high dielectric constant of perovskite layers and the electron-suppressing properties of amorphous layers, leading to a more efficient data storage medium.
Implementation Method 1
an amorphous layer is provided between every two adjacent perovskite layers to suppress the output of electrons, thereby reducing the leakage current
Implementation Method 2
The dielectric layer comprises at least two perovskite layers stacked; two outermost perovskite layers of the at least two perovskite layers are in contact with the two electrodes
Data Source
AI summary
A capacitor structure includes two electrodes arranged oppositely and a dielectric layer located between the two electrodes, wherein the dielectric layer includes at least two perovskite layers stacked; an amorphous layer is provided between every two adjacent perovskite layers; two outermost perovskite layers of the at least two perovskite layers are in contact with the two electrodes, respectively.