MIM Capacitor Structure With Work Function Metal Barrier Layers
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Solution Overview
Problem
High-k dielectric materials in capacitor structures for semiconductor devices offer increased capacitive capacity but are limited by lower breakdown voltage and higher current leakage compared to low-k dielectric materials.
Innovation Solution
Incorporating work function metal layers between the insulator layer and the conductive electrode layers in a metal-insulator-metal (MIM) capacitor structure to enhance the electron barrier height, allowing for the use of high-k dielectric materials while minimizing breakdown voltage impact and current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-k dielectric materials are used in capacitor structures, then capacitive capacity is increased, but breakdown voltage decreases and current leakage increases
Solution Approach 1:
The patent uses a composite material structure consisting of a high-k dielectric layer combined with work function metal layers (such as titanium nitride or tungsten). This composite structure allows the capacitor to achieve high capacitive capacity from the high-k dielectric while the work function metal layers provide protective barriers that maintain breakdown voltage and reduce current leakage, thus resolving the contradiction between capacitive capacity and reliability
Solution Approach 2:
The work function metal layers serve as intermediary layers between the high-k dielectric material and the conductive electrode layers. These intermediary layers prevent direct contact between the high-k dielectric and the electrodes, thereby blocking the harmful effects of high current leakage and low breakdown voltage inherent in high-k materials, while still allowing the high-k dielectric to provide its capacitive benefits
2Quantity of substance
If high-k dielectric materials are used in capacitor structures, then capacitive capacity is increased, but current leakage increases
Solution Approach 1:
The work function metal layers act as intermediary barrier layers between the high-k dielectric and the conductive electrodes. These layers prevent direct electrical contact that would cause high current leakage, while allowing the high-k dielectric to maintain its high capacitive capacity. The work function metal layers effectively mediate the interaction between the high-k dielectric and electrodes, blocking the harmful current leakage
Solution Approach 2:
The capacitor structure employs a composite material system where high-k dielectric material is combined with work function metal layers. This composite structure leverages the high capacitive capacity of the high-k dielectric while the work function metal layers provide low leakage pathways, thus achieving both high capacitive capacity and low current leakage simultaneously
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 approach increases capacitive capacity while maintaining or improving breakdown voltage and reducing current leakage, effectively leveraging the benefits of high-k dielectric materials in semiconductor devices.
Implementation Method 1
The work function metal layers may provide an increased electron barrier height between the insulator layer and the conductive electrode layers, which may increase the breakdown voltage and may reduce the current leakage for the capacitor structure
Implementation Method 2
High dielectric constant (high-k) dielectric materials may offer desirable improvements in a capacitor structure for the insulator layer. Capacitive capacity of the capacitor structure may be directly proportional to the dielectric constant of the insulator layer
Data Source
AI summary
In some implementations described herein, a capacitor structure may include a metal-insulator-metal structure in which work function metal layers are included between the insulator layer of the capacitor structure and the conductive electrode layers of the capacitor structure. The work function metal layers may enable high-k dielectric materials to be used for the insulator layer in that the work function metal layers may provide an increased electron barrier height between the insulator layer and the conductive electrode layers, which may increase the breakdown voltage and may reduce the current leakage for the capacitor structure.