Near-Infrared Coloring Agent Resin Coating for Film Uniformity
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Solution Overview
Problem
Near-infrared absorption compositions with low dispersibility and high thixotropy pose challenges in achieving even film thickness during spin coating, leading to in-plane unevenness in solid-state imaging devices.
Innovation Solution
A near-infrared absorption composition is developed by coating near-infrared absorption coloring agents with a resin containing a coloring agent structure, heterocyclic structure, or acyclic hetero atom-containing groups, enhancing dispersibility and reducing thixotropy by improving the surface treatment of the coloring agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If near-infrared absorption coloring agents are used without surface treatment, then the composition simplicity is maintained, but the dispersibility of the coloring agent in the composition decreases
Solution Approach 1:
The coloring agent particles are subjected to surface treatment with silane coupling agents or surfactants before being incorporated into the resin composition. This preliminary action modifies the particle surface properties, enabling better dispersion in the resin matrix without complicating the overall composition formulation process
Solution Approach 2:
Silane coupling agents and surfactants are introduced as intermediary substances between the coloring agent particles and the resin matrix. These intermediaries reduce interfacial tension and improve wetting, thereby enhancing dispersibility while maintaining composition simplicity
2Ease of manufacture
If near-infrared absorption coloring agents are used without surface treatment, then the manufacturing process is simplified, but the dispersibility of the coloring agent easily decreases
Solution Approach 1:
Surface treatment of coloring agent particles is performed as a preliminary step before final composition assembly. This allows the treatment to be conducted under optimized conditions separately, maintaining overall manufacturing simplicity while ensuring good dispersibility
Solution Approach 2:
Silane coupling agents serve as intermediaries that can be applied through simple dip-coating or mixing processes, adding minimal steps to the manufacturing workflow while dramatically improving dispersibility outcomes
3Stability of the object's composition
If the thixotropy of the composition is high, then the composition stability is improved, but the in-plane evenness of the coated film decreases during spin coating
Solution Approach 1:
The thixotropy of the composition is controlled by adjusting parameters such as resin viscosity, coloring agent particle size distribution, and solvent composition. By optimizing these parameters, the composition maintains adequate stability while reducing excessive thixotropic behavior that causes film thickness variation during spin coating
Solution Approach 2:
Rather than completely eliminating thixotropy, the invention allows for partial thixotropic behavior that provides sufficient composition stability, while controlling the degree to prevent excessive thickening that would cause in-plane evenness problems during coating
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 coated composition achieves high dispersibility and low thixotropy, resulting in improved in-plane evenness and pattern forming properties in solid-state imaging devices.
Implementation Method 1
a processed pigment obtained by coating a pigment having a maximum absorption wavelength in a visible range with a block copolymer having a pigment adsorptive block and a pigment non-adsorptive block
Implementation Method 2
a composition including a near-infrared absorption coloring agent tends to have high thixotropy. If the thixotropy is high, when spin coating is performed, a thickness of a coated film in the center and the circumference of spin coating varies
Data Source
AI summary
The near-infrared absorption composition includes a processed coloring agent obtained by coating a near-infrared absorption coloring agent with a resin having one or more selected from a coloring agent structure, a heterocyclic structure, and an acyclic hetero atom-containing group. The near-infrared absorption coloring agent is preferably one or more selected from a phthalocyanine coloring agent, a perylene coloring agent, a pyrrolopyrrole coloring agent, a cyanine coloring agent, a dithiol metal complex coloring agent, a naphthoquinone coloring agent, a diimmonium coloring agent, an azo coloring agent, and a squarylium coloring agent and more preferably a pyrrolopyrrole coloring agent.