Inkjet Diffusing Agent Composition for Solar Battery Electrode
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Solution Overview
Problem
Conventional diffusing agent compositions for ink-jet systems, containing ethanol or isopropyl alcohol, suffer from rapid drying characteristics leading to clogging and blurring of patterns on substrates resistant to infiltration, resulting in non-uniform coatings and pattern bleeding.
Innovation Solution
A diffusing agent composition with a solvent blend of 70-90% solvent having a boiling point ≤100°C and 1-20% solvent with a boiling point of 180-230°C, along with a silicon compound and impurity-diffusing component, is used to prevent bleeding and ensure pattern fidelity on resistant substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solvent having a high boiling point such as glycerin or dimethyl formamide is contained in a large amount to prevent clogging, then discharge stability is improved, but the coating liquid is hard to dry and the pattern may bleed or spread
Solution Approach 1:
The patent changes the physical parameters of the solvent system by selecting solvents with specific boiling point ranges (first solvent: 60-100°C, second solvent: 150-230°C) and controlling their proportions (first solvent: 70-90% by mass, second solvent: 10-30% by mass). This parameter optimization allows the composition to dry at appropriate speeds while maintaining discharge stability, preventing both clogging and pattern bleeding.
Solution Approach 2:
The patent uses a composite solvent system combining two different solvents with complementary properties. The first solvent (lower boiling point) provides rapid initial drying to prevent pattern spreading, while the second solvent (higher boiling point) ensures sufficient drying time and prevents clogging. This composite approach balances the conflicting requirements of discharge stability and pattern fidelity.
2Ease of manufacture
If conventional diffusing agent compositions containing ethanol or isopropyl alcohol are used, then easy pattern formation is enabled, but rapid drying characteristics result in clogging at head portion
Solution Approach 1:
The patent modifies the drying characteristics by replacing conventional single-solvent systems with a dual-solvent system where the first solvent has a boiling point of 60-100°C and the second solvent has a boiling point of 150-230°C. This parameter change extends the effective drying time window, preventing premature clogging while maintaining the ease of pattern formation associated with conventional solvents.
Solution Approach 2:
The second solvent (higher boiling point) acts as an intermediary that extends the liquid state duration of the composition. It mediates between the rapid evaporation of the first solvent and the need to prevent clogging, allowing the composition to remain dischargeable longer while still forming patterns easily.
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 composition enables precise pattern formation without bleeding or blurring, maintaining pattern integrity and preventing non-uniform coating, even on substrates resistant to infiltration, by controlling the solvent blend and silicon compound content.
Implementation Method 1
the coating liquid is hard to dry, so that the pattern after coating may bleed or spread
Implementation Method 2
the solvent (c) contains (c1) a solvent having a boiling point of no higher than 100° C. and (c2) a solvent having a boiling point of 180 to 230° C.
Data Source
AI summary
Provided are: a diffusing agent composition for ink-jet; a method for production of electrode and solar battery using the diffusing agent composition; and a solar battery produced by the method for production. The diffusing agent composition for ink-jet includes (a) a silicon compound, (b) an impurity-diffusing component and (c) a solvent, in which: the solvent (c) contains (c1) a solvent having a boiling point of no higher than 100° C. and (c2) a solvent having a boiling point of 180 to 230° C.; and the solvent (c1) is contained at a ratio of 70 to 90% by mass and the solvent (c2) is contained at a ratio of 1 to 20% by mass both relative to the total mass of the composition.