Controlled multiple neutral planes by low elastic modulus adhesive for flexible organic photovoltaics

Area of Science:

• Materials Science
• Mechanical Engineering
• Organic Electronics

Background:

• Brittle layers in organic photovoltaic (OPV) devices are susceptible to damage during bending.
• The mechanical neutral plane strategy offers protection by minimizing stress on sensitive materials.
• Previous methods were limited to protecting a single layer at a specific location.

Purpose of the Study:

• To develop a method for protecting multiple brittle layers in OPVs at various locations.
• To enhance the mechanical robustness and durability of flexible organic electronic devices.
• To provide design guidelines for multilayer structures utilizing multiple neutral planes.

Main Methods:

• Generating multiple neutral planes using low elastic modulus adhesives.
• Employing quantitative analyses to control neutral plane locations.
• Demonstrating protection under both concave and convex bending.
• Utilizing finite element method (FEM) analysis for multilayer structures.

Main Results:

• Successfully protected multiple brittle layers at various locations using the proposed method.
• Demonstrated effective protection under both concave and convex bending conditions.
• FEM analysis provided insights into stress distribution in multilayer structures with soft adhesives.

Conclusions:

• The multiple neutral plane strategy effectively enhances the protection of brittle layers in flexible OPVs.
• Low elastic modulus adhesives are crucial for creating and controlling multiple neutral planes.
• The study provides valuable design guidelines for robust flexible organic electronic devices.