Platinum Electrode Dielectric Film Capacitor Adhesion
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Solution Overview
Problem
Dielectric film capacitors face challenges in achieving strong adhesion between the lower electrode and the silicon-based insulating layer, leading to separation issues during manufacturing, especially when using platinum electrodes, which affects the device's performance and yield.
Innovation Solution
A dielectric film capacitor design featuring a platinum lower electrode with a thickness of 10 to 100 nm and an oxide dielectric film with an ABOx crystal structure, where the lower electrode's planar area is 50% or more of the dielectric film's formation region, enhancing adhesion and thermal stability, and a method involving direct formation of the dielectric film using a liquid phase method with a specific composition and patterning to ensure reliable adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a platinum lower electrode is used, then oxidation resistance and thermal stability are improved, but adhesion to the silicon-based insulating layer deteriorates
Solution Approach 1:
A ruthenium oxide layer is introduced as an intermediary between the platinum lower electrode and the silicon-based insulating layer. This intermediate layer serves as a bridge that provides both oxidation resistance (inheriting from the platinum) and improved adhesion to the insulating layer, thereby resolving the contradiction between oxidation resistance and adhesion strength.
2Strength
If a titanium adhesive layer is formed, then adhesion between the lower electrode and insulating layer is improved, but substrate warping and oxide diffusion occur
Solution Approach 1:
The patent changes the material parameter of the adhesive layer from titanium to ruthenium oxide. This material substitution maintains the adhesion function while eliminating the harmful effects of substrate warping and oxide diffusion, as ruthenium oxide does not exhibit these problematic behaviors during the heating and oxidation processes.
3Strength
If a gold adhesive layer is formed, then adhesion is improved, but manufacturing cost increases and adhesion may still be insufficient
Solution Approach 1:
The patent replaces expensive noble metal adhesives (gold) with a more cost-effective ruthenium oxide adhesive layer. This substitution maintains the necessary adhesion function while significantly reducing manufacturing costs, making the process more economically viable without sacrificing performance.
4Strength
If the lower electrode planar area is increased, then adhesion is improved, but device size increases
Solution Approach 1:
The patent changes the material composition parameter of the lower electrode by introducing a ruthenium oxide layer, which inherently provides better adhesion properties. This material parameter change allows for reduced electrode area while maintaining sufficient adhesion strength, thereby reducing device size without compromising bonding strength.
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 provides improved adhesion and thermal stability, preventing electrode separation during patterning and ensuring high yield and excellent electrical characteristics of the dielectric film capacitor.
Implementation Method 1
forming a dielectric film directly on the lower electrode
Implementation Method 2
enhancing adhesion and thermal stability
Data Source
AI summary
A dielectric film capacitor includes a lower electrode having an opening and formed of a material including platinum, a dielectric film provided over the lower electrode and including an oxide having an ABOx crystal structure, and an upper electrode provided over the dielectric film. The planar area of the lower electrode is 50% or more of the area of a formation region of the dielectric film. A dielectric film capacitor includes a lower electrode formed of a material including platinum and having a thickness of 10 to 100 nm, a dielectric film provided over the lower electrode and including an oxide having an ABOx crystal structure, and an upper electrode provided over the dielectric film.