Semiconductor Capacitor Interface Stack for Thin Dielectric Leakage Control
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Solution Overview
Problem
Capacitors in semiconductor devices face a challenge in achieving high electrostatic capacitance while minimizing leakage currents, as reducing the thickness of the dielectric layer increases leakage currents.
Innovation Solution
A capacitor structure is developed with a primary lower electrode, an interface structure comprising sequentially stacked first, second, and third interface layers, and a primary dielectric layer, where the interface layers are doped with specific metals and nitrogen to enhance conductivity and reduce leakage, and the dielectric layer includes a tetravalent metal oxide to maintain capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the dielectric layer is decreased to increase electrostatic capacitance, then the capacitance is improved, but the leakage current increases
Solution Approach 1:
The interface structure is divided into three distinct interface layers (first, second, and third interface layers) with different material compositions and doping levels. This segmentation allows each layer to perform specific functions: the first layer provides basic interface quality, the second layer enhances conductivity through pentavalent element doping, and the third layer further optimizes the interface with nitrogen doping, collectively reducing leakage current while maintaining thin dielectric layer performance
Solution Approach 2:
Different regions of the interface structure are doped with different elements at different concentrations to create localized properties. The first interface layer uses pentavalent element doping for local conductivity enhancement, while the third interface layer uses nitrogen doping for specific interface quality improvement. This local quality optimization allows the thin dielectric layer to maintain low leakage current without sacrificing capacitance
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 proposed structure effectively decreases leakage currents while maintaining high capacitance by optimizing the conductivity of the interface layers and the dielectric properties of the dielectric layer, improving the overall electrical characteristics of the capacitor.
Implementation Method 1
The first interface layer may have electrical conductivity, and may include a second metal oxide doped with a pentavalent element
Implementation Method 2
The second interface layer may be on the first interface layer, and may include a material further doped with nitrogen in the material of the first interface layer
Implementation Method 3
The third interface layer may be on the second interface layer, and may include a third metal oxide doped with nitrogen
Implementation Method 4
a primary dielectric layer including a first metal oxide on the interface structure
Data Source
AI summary
A capacitor may include a primary lower electrode, an interface structure on a surface of the primary lower electrode, a primary dielectric layer including a metal oxide on the interface structure, the primary dielectric layer, and an upper electrode on the primary dielectric layer. The interface structure may include a first interface layer, a second interface layer, and a third interface layer. The first interface layer may have electrical conductivity, and may include a metal oxide doped with a pentavalent element. The second interface layer may be on the first interface layer, and may include a material further doped with nitrogen in the material of the first interface layer. The third interface layer may be on the second interface layer, and may include a metal oxide doped with nitrogen. A metal included in the metal oxide of the third interface layer may include a tetravalent metal.