On the Nature of Charge Injecting Contacts in Organic Field-Effect Transistors.
2020
Organic
field-effect transistors (OFETs) are key enabling devices for plastic
electronics technology, which has a potentially disruptive impact
on a variety of application fields, such as health, safety, and communication.
Despite the tremendous advancements in understanding the OFET working
mechanisms and device performance, further insights into the complex
correlation between the nature of the charge-injecting contacts and
the electrical characteristics of devices are still necessary. Here,
an in-depth study of the metal–organic interfaces that provides
a direct correlation to the performance of OFET devices is reported.
The combination of synchrotron X-ray spectroscopy, atomic force microscopy,
electron microscopy, and theoretical simulations on two selected electron
transport organic semiconductors with tailored chemical structures
allows us to gain insights into the nature of the injecting contacts.
This multiple analysis repeated at the different stages of contact
formation provides a clear picture on the synergy between organic/metal
interactions, interfacial morphology, and structural organization
of the electrode. The simultaneous synchrotron X-ray experiments and
electrical measurements of OFETs in operando uncovers
how the nature of the charge-injecting contacts has a direct impact
on the injection potential of OFETs.
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