Ferroelectric-Dielectric Capacitor for Thin-Film Capacitance Boosting
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Solution Overview
Problem
The challenge is to enhance the capacitance of scaled-down devices such as transistors and capacitors, which require materials with high dielectric constants to effectively boost capacitance when a voltage is applied, as existing technologies struggle to achieve significant capacitance boosting effects.
Innovation Solution
A method and structure involving a capacitor with a ferroelectric film and a dielectric film, where the impedance of both films is controlled to achieve a capacitance boosting operating voltage, determined by specific equations, ensuring a sharp increase in capacitance by adjusting the impedance ratio and angular frequency of the control voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the size of devices such as transistors and capacitors is scaled down, then device density and integration are improved, but the thickness of devices is limited and capacitance boosting becomes difficult to achieve
Solution Approach 1:
The patent employs a composite structure consisting of a ferroelectric film and a dielectric film stacked together. The ferroelectric film provides negative capacitance effect while the dielectric film provides positive capacitance, creating a composite capacitor that achieves capacitance boosting in thin-film configurations suitable for scaled-down devices
Solution Approach 2:
The patent changes the electrical parameters of the capacitor by controlling the impedance ratio between the ferroelectric film and dielectric film. By adjusting the thickness and material properties of each film layer, the system achieves optimal capacitance boosting effect at specific operating voltages while maintaining thin overall structure
2Quantity of substance
If materials with high dielectric constant are used to boost capacitance, then capacitance is improved, but the capacitance boosting effect is not sharp enough and device complexity increases
Solution Approach 1:
The patent utilizes the phase transition characteristics of ferroelectric materials, which exhibit spontaneous polarization and can switch between different polarization states. This phase transition behavior enables sharp capacitance boosting effect when a threshold voltage is applied, providing superior performance compared to conventional high-k dielectric materials
Solution Approach 2:
The dielectric film acts as an intermediary element that stabilizes the ferroelectric film and enables practical implementation of negative capacitance. The dielectric film with appropriate impedance ratio allows the system to achieve sharp capacitance boosting while maintaining device reliability and controllability
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 significantly increases the capacitance of the capacitor, achieving a capacitance boosting effect with controlled impedance and current density, suitable for applications in transistors and memory devices.
Implementation Method 1
research is being conducted on the effect of boosting capacitance using negative capacitance. The capacitance boosting effect may sharply increase the dielectric constant of a capacitor when a voltage is applied to the capacitor
Implementation Method 2
a ferroelectric film provided between the first electrode and the second electrode
Data Source
AI summary
A capacitor comprises a first electrode, a second electrode provided on the first electrode, a ferroelectric film provided between the first electrode and the second electrode, and a dielectric film provided between the ferroelectric film and the second electrode, impedance of the ferroelectric film and impedance of the dielectric film are determined such that a control voltage applied between the first electrode and the second electrode is equal to a capacitance boosting operating voltage, and the capacitance boosting operating voltage is determined by the following equation:VMAX=(1+<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"</annotation></semantics>Z2<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"</annotation></semantics><semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"</annotation></semantics>Z1<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"</annotation></semantics>)tFEFMwhere VMAX is a capacitance boosting operating voltage, Z1 is impedance of the ferroelectric film, Z2 is impedance of the dielectric film, tF is a thickness of the ferroelectric film, and EFM is an electric field applied to the ferroelectric film having a maximum polarization.