2 research outputs found
Electrospray-Processed Soluble Acenes toward the Realization of High-Performance Field-Effect Transistors
Functionalized acenes have proven
to be promising compounds in the field of molecular electronics because
of their unique features in terms of the stability, performance, and
ease of processing. The emerging concept of large-area-compatible
techniques for flexible electronics has brought about a wide variety
of well-established techniques for the deposition of soluble acenes,
with spray-coating representing an especially fruitful approach. In
the present study, electrostatic spray deposition is proposed as an
alternative to the conventional spray-coating processes, toward the
realization of high-performance organic field-effect transistors (OFETs),
on both rigid and flexible substrates. Particularly, a thorough study
on the effect of the solvent and spraying regime on the resulting
crystalline film’s morphology is performed. By optimization
of the process conditions in terms of control over the size as well
as the crystallization scheme of the droplets, desirable morphological
features along with high-quality crystal domains are obtained. The
fabricated OFETs exhibit excellent electrical characteristics, with
high field-effect mobility up to 0.78 cm<sup>2</sup>/(V s), <i>I</i><sub>on</sub>/<i>I</i><sub>off</sub> >10<sup>4</sup>, and near-zero threshold voltages. Additionally, the good
performance of the OFETs realized on plastic substrates gives great
potentiality to the proposed method for applications in the challenging
field of large-area electronics
Polyelectrolyte Layer-by-Layer Assembly on Organic Electrochemical Transistors
Oppositely
charged polyelectrolyte multilayers (PEMs) were built up in a layer-by-layer
(LbL) assembly on top of the conducting polymer channel of an organic
electrochemical transistor (OECT), aiming to combine the advantages
of well-established PEMs with a high performance electronic transducer.
The multilayered film is a model system to investigate the impact
of biofunctionalization on the operation of OECTs comprising a poly(3,4-ethylenedioxythiophene)
polystyrenesulfonate (PEDOT:PSS) film as the electrically active
layer. Understanding the mechanism of ion injection into the channel
that is in direct contact with charged polymer films provides useful
insights for novel biosensing applications such as nucleic acid sensing.
Moreover, LbL is demonstrated to be a versatile electrode modification
tool enabling tailored surface features in terms of thickness, softness,
roughness, and charge. LbL assemblies built up on top of conducting
polymers will aid the design of new bioelectronic platforms for drug
delivery, tissue engineering, and medical diagnostics