Halide Complex Surface Modification for Solar Cell Backsheet Adhesion
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Solution Overview
Problem
Fluorine resin films used as solar cell backsheets have poor adhesive properties due to low surface energy, leading to water- and oil-repellent properties, and existing surface modification methods like plasma processing are costly and result in short-term adhesive improvements.
Innovation Solution
Contacting a halide complex of an element in Group 13 with the resin film surfaces to enhance adhesive properties, which maintains high adhesion over time without requiring large-scale apparatuses and reduces production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional surface modification methods (plasma discharge, corona discharge, flame processing) are used to improve adhesive properties of fluorine resin films, then adhesive properties are improved by introducing hydrophilic functional groups, but production costs increase due to large-scale apparatus requirements and aging occurs leading to loss of adhesive properties over time
Solution Approach 1:
The invention changes the chemical parameters of the fluorine resin surface by controlling the concentration and type of halide complexes (BF3, BCl3, BBr3, AlCl3, InCl3) and processing conditions (temperature, time) to introduce hydrophilic functional groups. This chemical parameter change achieves improved adhesive properties without requiring large-scale plasma or corona discharge apparatus, thereby reducing production costs while maintaining long-term adhesive performance
Solution Approach 2:
The invention uses halide complexes as intermediary substances that mediate between the fluorine resin surface and the desired adhesive properties. These halide complexes react with the fluorine resin surface to form hydrophilic functional groups, serving as a chemical bridge that improves adhesion without requiring expensive large-scale physical treatment apparatus
2Strength
If conventional surface modification methods are used to improve adhesive properties, then adhesive properties are improved, but aging occurs leading to significant loss of adhesive properties after a long period
Solution Approach 1:
The invention optimizes chemical parameters including the type of halide complex (BF3, BCl3, BBr3, AlCl3, InCl3), concentration (0.1-10 mmol/mL), temperature (20-100°C), and treatment time (1 minute to 24 hours) to create stable hydrophilic functional groups on the fluorine resin surface. These controlled chemical changes produce durable adhesive properties that resist aging, maintaining reliability over long periods without significant degradation
3Strength
If conventional surface modification methods are used, then adhesive properties are improved, but large-scale apparatus is required leading to increased production costs
Solution Approach 1:
The invention employs halide complexes as simple chemical intermediaries that can be applied using basic laboratory equipment (flasks, beakers, heating devices) rather than complex large-scale plasma or corona discharge apparatus. This intermediary approach dramatically simplifies the device requirements while achieving the same adhesive improvement goal
Solution Approach 2:
The invention uses small amounts of halide complex solutions (cheap chemical reagents) that can be easily prepared and disposed of, replacing expensive large-scale apparatus. The halide complexes are applied in small concentrations (0.1-10 mmol/mL) and can be handled with simple equipment, making the process economically viable without complex infrastructure
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 method improves adhesive properties and suppresses aging, enabling the production of reliable laminated films suitable for solar cell backsheets with reduced production costs and long-term adhesive performance.
Implementation Method 1
bringing a halide complex of an element in Group 13 of the periodic table into contact with at least a part of a region in the surfaces of a resin film so as to improve adhesive properties
Data Source
Figure 1(a)~2
AI summary
It is an object of the present invention to provide a surface-modified film which has adhesive properties improved by surface modification and a process for producing the same. It is also an object of the present invention to provide a laminated film in which at least the surface-modified film has been laminated and a process for producing the laminated film. The surface-modified film according to the present invention is characterized by being obtained by bringing a halide complex of an element in Group 13 of the periodic table into contact with at least a part of a region in the surfaces of a resin film.