10 research outputs found
Chemical Investigation on Various Aromatic Compounds Polymerization in Low Pressure Helium Plasma
International audienc
Universal Scaling of DC Conductivity with Dielectric Interfacial Polarization in Conjugated Polymers
Understanding the intricate relationship between conductivity
and
polymer film microstructure is paramount to designing and developing
high-performance conjugated-polymer-based electronic devices. Conjugated
polymers are typically semicrystalline, and their films comprise both
highly crystalline and amorphous regions with significant disparity
between the conductivity of these regions. However, traditional conductivity
measurements under steady-state conditions overlook the presence of
the amorphous phase, offering an incomplete perspective on charge
transport. Here, by employing isothermal dielectric measurements,
we reveal that the amorphous phase plays a pivotal role and dominates
the electrical conductivity at temperatures more pertinent to practical
applications, while the crystalline fraction takes precedence at temperatures
below room temperature. The conductivity mismatch between the amorphous
and crystalline phases yields the Maxwell-Wagner-Sillars interfacial
polarization (MWS-IP) effect. Here we demonstrated that the existence
of MWS-IP ensues a universal scaling between the electrical conductivity,
the relaxation time and the dielectric relaxation strength, for various
conjugated polymers and their blends. Shedding light on the contribution
of the amorphous phase in the conductivity of conjugated polymers
can lead to the development of new polymers for applications in electronic
devices with improved performance at operationally relevant temperatures