High-k Dielectric Capacitor Charge Trapping Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-k dielectric materials in capacitors used in memory devices are susceptible to charge trapping and polarization effects, leading to degradation over time and reduced ability to store charge of the opposite state, which affects data integrity and storage capacity.
Innovation Solution
Incorporating circuitry that occasionally inverts the data stored in high-k dielectric capacitors to reduce charge trapping and polarization effects, and tracking the initial state to ensure proper polarity during operations, thereby prolonging the lifetime of the capacitors and maintaining data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-k dielectric materials are used as capacitor dielectric film, then charge storage capacity is improved, but charge trapping and polarization effects worsen
Solution Approach 1:
The patent applies periodic action by implementing refresh operations that periodically read and rewrite data stored in capacitors using high-k dielectric materials. This periodic refresh cycle prevents charge trapping and polarization effects from degrading capacitor performance over time, allowing the system to maintain both high charge storage capacity and reliable operation.
2Duration of action of moving object
If charge is stored on high-k dielectric capacitor for long periods, then data retention is improved, but transient effects and charge trapping increase
Solution Approach 1:
The patent applies preliminary action by performing refresh operations before charge trapping and polarization effects significantly degrade capacitor performance. The system periodically reads and rewrites stored data, preemptively clearing trapped charges and realigning electric dipoles before they cause substantial harm, thus maintaining both long data retention and low transient effects.
3Quantity of substance
If electric field is applied to high-k material for sufficient time, then charge storage capacity is improved, but electron tunneling into trapping states increases
Solution Approach 1:
The patent applies periodic action by implementing refresh operations that periodically read and rewrite data stored in capacitors using high-k dielectric materials. This periodic refresh cycle prevents charge trapping and polarization effects from degrading capacitor performance over time, allowing the system to maintain both high charge storage capacity and reliable operation.
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 effectively reduces adverse transient effects, prolongs the lifespan of high-k dielectric materials, and ensures data integrity by frequently inverting stored charge, thereby delaying dielectric breakdown and maintaining accurate data storage.
Implementation Method 1
High-k dielectric materials such as hafnium and zirconium silicates and oxides (e.g., HfSiON, HfO2, HfSiO, HfSiON, etc.) and other materials or stacks of materials (e.g. ZrO2/SiO2/ZrO2, ZrO2/Al2O3/ZrO2, etc.) having a relatively high dielectric permittivity can be used in place of SiO2 as the capacitor dielectric film.
Implementation Method 2
Electric dipoles tend to align in high-k material when an external electric field is applied to the capacitor electrodes.
Implementation Method 3
When an electric field is applied for a sufficient time electrons tunnel from the capacitor electrodes into trapping states, creating charged states in the high-k dielectric material.
Data Source
AI summary
In one embodiment, an integrated circuit includes a memory array having a plurality of capacitors for storing data of an initial state in the memory array in an initial state. The integrated circuit also includes circuitry for occasionally inverting the data stored by the plurality of capacitors and tracking whether the current state of the data stored by the plurality of capacitors corresponds to the initial state. The circuitry inverts the data read out of the memory array during a read operation when the current state of the data does not correspond to the initial state.