Organic Semiconductor Additive Neutralizes Water Trapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic semiconductor devices exhibit poor performance stability due to charge carrier trapping effects caused by water species, leading to instability over time when exposed to various atmospheres and extended operation.
Innovation Solution
Incorporating a molecular additive with specific properties, such as F4-TCNQ or TCNQ, into the semiconductor layer at a concentration of at least 0.1% by weight, which occupies voids within the organic material and has a smaller charge carrier trapping effect than water, thereby reducing threshold voltage shifts and maintaining device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water species are present in the organic semiconductor layer, then the device can be manufactured with standard processes, but charge carrier trapping effects occur leading to poor performance stability
Solution Approach 1:
The patent introduces an intermediary substance (additive molecule) that mediates between water species and charge carriers. The additive occupies voids in the organic semiconductor and interacts with water molecules to prevent charge carrier trapping, thereby maintaining device reliability without requiring complete water removal or complex manufacturing changes
Solution Approach 2:
The patent converts the harmful effect of water species into a beneficial outcome by using the additive to occupy voids and prevent water-induced trapping. The presence of water, which would normally degrade performance, is tolerated because the additive neutralizes its harmful effects, effectively converting the harmful presence into an acceptable condition
2Reliability
If additive concentration is increased to improve stability, then threshold voltage changes are reduced, but device complexity increases
Solution Approach 1:
The patent optimizes the concentration parameter of the additive, establishing that a minimum threshold (at least 0.1% by weight) is sufficient to achieve the desired stability improvement. This parameter optimization allows achieving reliability goals without unnecessarily increasing device complexity or requiring complex multi-component formulations
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 additive significantly improves the environmental and operational stability of organic semiconductor devices by reducing threshold voltage changes and maintaining device performance without increasing OFF-current, even under stress conditions, and can be used in various electronic and optoelectronic devices.
Implementation Method 1
the additive occupies at least some voids within the semiconductive organic material occupiable by water molecules
Implementation Method 2
which additive at least partly negates a charge carrier trapping effect caused by the water species on the semiconductive organic material
Data Source
AI summary
An electronic or optoelectronic device including a semiconductor layer, wherein the semiconductor layer comprises at least a semiconductive organic material, water species, and at least one additive in an amount of at least 0.1% by weight relative to the semiconductive organic material, which additive at least partly negates a charge carrier trapping effect caused by the water species on the semiconductive organic material.