Topological Material Capacitor Electrodes for Nanoscale Resistivity Control
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Solution Overview
Problem
The challenge in integrated circuit devices is to reduce the size of unit cells while maintaining effective electrical performance, which requires materials and structures that can scale without significant increases in resistivity.
Innovation Solution
A capacitor design incorporating a first electrode with a topological material and a second electrode, separated by a dielectric film, where the first electrode includes a conductive layer with a metal oxide and a second conductive layer with a topological material, sharing at least one same metal element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive materials are used in capacitor electrodes, then manufacturing is simpler, but resistivity increases significantly as line width decreases
Solution Approach 1:
The electrode uses a composite structure combining metal oxide (providing oxidation resistance) and topological material (providing low resistivity that remains stable at nanoscale dimensions). This composite approach allows the electrode to maintain excellent electrical performance even as line width decreases to 10nm and below.
Solution Approach 2:
The invention changes the material parameters by introducing topological materials with unique electronic band structures that exhibit robust surface states. These materials maintain constant resistivity regardless of dimensional scaling, fundamentally changing how electrode resistivity behaves as line width decreases.
2Reliability
If topological material is used in the second conductive layer, then oxidation resistance is enhanced, but device complexity increases
Solution Approach 1:
The electrode is segmented into two distinct functional layers: the first conductive layer containing metal oxide for oxidation resistance, and the second conductive layer containing topological material for low and stable resistivity. This segmentation allows each layer to optimize its specific function while together they provide comprehensive performance.
Solution Approach 2:
The topological material layer serves multiple functions: it provides low resistivity, maintains resistivity stability during scaling, offers oxidation resistance, and enables epitaxial growth of high-k dielectric films. This multi-functionality reduces the need for additional specialized layers.
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 configuration reduces resistivity changes with decreasing line width, enhances oxidation resistance, and improves electrical performance by minimizing contact resistance and leakage currents.
Implementation Method 1
a second conductive layer in contact with the dielectric film and including a second conductor of a different chemical composition than the first conductor, and the first conductor and the second conductor include at least one same metal element
Implementation Method 2
enhances oxidation resistance
Implementation Method 3
a dielectric film between the first electrode and the second electrode
Implementation Method 4
a dielectric material which is a product of epitaxial growth on the first surface of the second conductive layer
Data Source
AI summary
A capacitor, and a semiconductor device including the capacitor and an electronic device including the capacitor or the semiconductor device. The capacitor includes a first electrode, a second electrode facing the first electrode, and a dielectric film between the first electrode and the second electrode. The first electrode includes a topological material.