Capacitor Interlayer Materials for Low Leakage at High Integration
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Solution Overview
Problem
As semiconductor elements become more highly integrated and finer, they face challenges with decreased capacitance and increased leakage current, particularly due to structural deterioration and crystalline changes at the electrode-dielectric interface, which existing methods struggle to address effectively.
Innovation Solution
Incorporating a Group 13 element other than aluminum, such as boron, gallium, or indium, in the interlayer between the electrode and dielectric layers to enhance structural stability and reduce leakage current, while maintaining high capacitance, by using materials like gallium oxide or indium oxide with specific work functions and thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the size of capacitor is decreased for higher integration, then the capacitance decreases and leakage current increases
Solution Approach 1:
The patent changes the material parameter of the interlayer from conventional materials (such as titanium oxide or nickel oxide) to a material containing a Group 13 element other than aluminum (such as gallium oxide or indium oxide). This material parameter change modifies the work function and electronic structure of the interlayer, thereby reducing electron injection into the dielectric layer and suppressing leakage current, while maintaining structural stability at reduced capacitor dimensions.
Solution Approach 2:
The patent employs a composite structure where the interlayer is formed by combining a base material with a Group 13 element (other than aluminum) such as gallium or indium. This composite material approach creates an interlayer with optimized properties: the Group 13 element contributes specific electronic characteristics that reduce leakage, while the overall composite structure maintains mechanical and structural stability in the miniaturized capacitor geometry.
2Ease of manufacture
If conventional interlayer materials are used, then manufacturing is simpler, but structural deterioration and crystalline changes occur at the electrode-dielectric interface
Solution Approach 1:
The patent modifies the chemical composition parameter of the interlayer by incorporating a Group 13 element (other than aluminum) such as gallium or indium. This compositional change results in an interlayer with enhanced structural stability and appropriate work function, preventing crystalline changes and structural deterioration at the electrode-dielectric interface while remaining compatible with existing manufacturing processes.
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 results in capacitors with improved structural stability, higher capacitance, and lower leakage current characteristics, effectively addressing the limitations of smaller semiconductor elements.
Implementation Method 1
the capacity of a capacitor is maintained by changing a capacitor structure, for example, by enlarging an electrode area or reducing the thickness of a dielectric layer
Implementation Method 2
the interlayer includes a first interface material, and the first interface material includes at least one Group 13 element other than aluminum (Al)
Data Source
AI summary
Provided are a capacitor and an electronic device including the same. The capacitor includes a first electrode layer, a second electrode layer, a dielectric layer disposed between the first electrode layer and the second electrode layer, and an interlayer disposed between the first electrode layer and the dielectric layer. The interlayer includes a first interface material, the first interface material includes at least one Group 13 element, and the at least one Group 13 element is not aluminum (Al).