Reliability and stability testing of flexible electronics
Reliability is one of the key factors when new structures are developed. Without adequate service life and reliability, a product cannot be commercially utilized.
In electronics stretchable and flexible structures are getting more and more popular. Such structures are utilized for example in medical and wearable electronics, smart cards, and flexible displays and batteries.
Several new structures and materials have been developed for flexible and stretchable electronics. However, the reliability and long-term behavior of these structures is still widely unknown and new test methods for their reliability analysis is needed.
Interconnections for flexible and stretchable structures
To create a product of printed flexible or stretchable structures they must be attached either to each other or to other structures such as energy sources.
Often the materials used in printed electronics are materials which cannot withstand soldering. With inks and substrate materials such as PET or paper, electrically conductive adhesives (ECA) are often used to form electrical connectivity between different parts.
Anisotropically conductive adhesives (ACA, ACF, ACP) and isotropically conductive adhesive (ICA, silver epoxies) can be used with flexible electronics.
Especially with ACAs very reliable interconnections for flexible attachments can be achieved. ACAs enable thin interconnections and small pitches and they can be used with many substrate, component and metallization materials.