Factors that effects the usage life of flexible films
Flexible electronics can be summarized as
new technology to prepare organic/inorganic electronic devices on extensible
plastics or thin metal plates, and flexible memory has become a major
development direction of information storage in the future. Among many
memories, resistive memory has been widely studied and applied due to its
advantages of high integration, long life, high storage density, and simple
preparation.
Because of its small size and precise size,
a thin-film substrate structure has become an indispensable part of mechanical
systems such as sensors, memories, and transistors. The flexibility of the film
substrate structure is mainly affected by the substrate, the adhesion force
between the films, and the young's modulus. The microcracks generated in the
process of stretching and bending also affect the grain boundary, the interface
between the film and the substrate, and then affect the electrical parameters
such as resistance.
1、 What are the
advantages of organic flexible substrate materials?
Pet is the most common flexible substrate
material with good dimensional stability, high-temperature resistance, and good
electrical insulation.
PI has good resistance to low temperature
and high temperature, and tensile resistance. It is commonly used in flexible
printed circuit board substrate and insulating materials.
Silk fibroin is a natural protein with good
biodegradability, human affinity, and good photoelectric properties.
Polyvinyl alcohol has good light resistance
and can be used in optoelectronic devices. It is non-toxic and non-irritating.
It can also be used in skin sensors.
2、 What are the
advantages of flexible electrode materials?
The flexible electrode includes metal film,
metal oxide film, metal oxide composite film, and polymer film. The metal film
has good conductivity. Metal oxide thin films have good heat and corrosion
resistance, and photoelectric properties are also outstanding. Among them, ITO
is the most widely used oxide with excellent conductivity and transmittance.
Metal oxide composite films have the advantages of low resistance and high
light transmittance. Polymer films are considered to be one of the most
valuable conductive films because of their good flexibility, high strength, and
good ductility.
3、 Study on
mechanical fatigue failure and mechanism
With the rapid development of the optical
microscope and electron microscope, researchers applied cyclic load on the film
structure by tensile, bending, and torsion test methods to observe the change
and mechanism of the film microstructure.
The commonly used detection methods mainly
include tensile test and bending test
4、 Effect of
fatigue failure on electrical characteristics
It is found that under the action of cyclic
stress, the film will break in different degrees, which will affect the carrier
transport. At present, the research on fatigue failure of thin films is still
limited to the post damage analysis, and it is difficult to analyze the effect
of loading on the fatigue of thin films before testing. Using mathematical
modeling methods to simulate the fatigue failure process of thin films and
improve the accuracy of mathematical simulation results consistent with the
fatigue failure process of thin films is the key direction of future research
work.