Organic Molecular Memory Fused Polycyclic Groups Charge Retention
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Solution Overview
Problem
Organic molecular memories face challenges in maintaining charge retention due to short distances between charges and electrodes, leading to rapid charge clearance and reduced data retention time.
Innovation Solution
Incorporating fused polycyclic groups into charge-storage or variable-resistance molecular chains within the organic molecular layer increases the relative permittivity, enhancing charge retention by weakening the electric field and increasing polarization energy, thus preventing charge tunneling and hopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If organic molecules are used in memory cells to reduce size, then storage density is increased, but charge retention time becomes shorter due to short distances between charges and electrodes
Solution Approach 1:
The patent changes the dielectric constant parameter of the organic molecular layer by introducing fused polycyclic groups. This parameter change increases the dielectric constant, which strengthens the electric field confinement and reduces charge tunneling to electrodes, thereby extending charge retention time while maintaining the small molecular structure for high storage density
Solution Approach 2:
The patent creates a composite molecular structure by incorporating fused polycyclic groups (such as anthracene, phenanthrene, or pyrene units) into the organic molecular layer. This composite structure combines the charge-storage capability of the molecular chain with the high dielectric constant property of fused polycyclic groups, achieving both high storage density and long charge retention time
2Length of moving object
If the distance between charges in molecules and surrounding electrodes is reduced for smaller memory cells, then device size is decreased, but charges are easily cleared from molecules due to charge movement between molecules and electrodes
Solution Approach 1:
The patent modifies the dielectric parameter of the organic molecular layer by incorporating fused polycyclic groups. This parameter change creates a stronger electric field confinement effect that prevents charge movement between molecules and electrodes, thereby improving charge stability while maintaining small device dimensions
Solution Approach 2:
The fused polycyclic groups act as an intermediary layer within the organic molecular structure. These groups with high dielectric constant serve as a buffer that reduces direct charge interaction with electrodes, preventing charge clearance while allowing the overall device to maintain compact size
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 integration of fused polycyclic groups significantly improves charge retention time, allowing for longer data retention and more stable memory performance by reducing charge clearance mechanisms, achieving retention times exceeding one hour with relative permittivity above 6.0.
Implementation Method 1
Incorporating fused polycyclic groups into charge-storage or variable-resistance molecular chains within the organic molecular layer increases the relative permittivity, enhancing charge retention by weakening the electric field and increasing polarization energy
Implementation Method 2
the integration of fused polycyclic groups significantly improves charge retention time, allowing for longer data retention and more stable memory performance by reducing charge clearance mechanisms, achieving retention times exceeding one hour with relative permittivity above 6.0
Data Source
AI summary
An organic molecular memory of an embodiment includes a first conductive layer, a second conductive layer, and an organic molecular layer interposed between the first conductive layer and the second conductive layer, the organic molecular layer including charge-storage molecular chains or variable-resistance molecular chains, the charge-storage molecular chains or the variable-resistance molecular chains including fused polycyclic groups.