Conductive Polymer Ink for Organic Solar Cells
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Solution Overview
Problem
Conductive polymer inks face challenges with high surface tension and low spreadability, making them unsuitable for inkjet printing in organic solar cell production, which affects the formation of transparent electrodes and photoactive layers.
Innovation Solution
A conductive polymer ink composition is developed, incorporating a water-based dispersion, a conductivity enhancer, a solvent mixture of water and organic solvents, and a combination of a fluorine-based surfactant and a surfactant with a hydrophile-lipophile balance (HLB) of 12 or above, enhancing spreadability and surface tension for improved jetting and coating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive polymer is used as-is for inkjet printing, then the material maintains its inherent high surface tension and low spreadability, but this makes it unsuitable for inkjet printing processes
Solution Approach 1:
The patent introduces surfactants as intermediary substances that mediate between the conductive polymer and the inkjet printing process. The surfactant reduces surface tension and improves spreadability, enabling the conductive polymer to be compatible with inkjet printing while maintaining its inherent stability and conductivity properties.
Solution Approach 2:
The patent modifies the surface tension parameter of the conductive polymer by adding surfactants. This parameter change transforms the material from unsuitable for inkjet printing (high surface tension) to suitable (reduced surface tension), while maintaining other critical properties like conductivity and stability.
2Ease of operation
If a surfactant is added to reduce surface tension, then jetting becomes possible, but the spreadability of the ink remains insufficient causing line disconnection
Solution Approach 1:
The patent creates a composite ink composition by combining conductive polymer with specifically selected surfactants. This composite material achieves both jetting capability and adequate spreadability, resolving the contradiction between operability and manufacturing precision in line pattern formation.
3Ease of operation
If an organic solvent with low surface tension is added to improve spreadability, then jetting properties deteriorate and conductivity decreases
Solution Approach 1:
The patent carefully controls the parameters of the conductive polymer concentration and surfactant type to achieve optimal spreadability without compromising conductivity. By adjusting these parameters within specific ranges, the ink maintains both good spreadability and electrical conductivity.
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 ink composition achieves excellent spreadability and conductivity, facilitating the formation of high-transparency, high-conductivity transparent electrodes suitable for replacing traditional ITO layers in organic solar cells, particularly through improved jetting and coating properties during inkjet printing.
Implementation Method 1
a fluorine-based surfactant and a surfactant having a hydrophile-lipophile balance (HLB) of 12 or above
Data Source
AI summary
Provided are a conductive polymer ink composition including a) a water-based dispersion including a conductive polymer, b) a conductivity enhancer, c) a solvent, and d) a fluorine-based surfactant and a surfactant having a hydrophile-lipophile balance (HLB) of 12 or above, and an organic solar cell including the same.