Lain McCulloch, Alberto Salieo, Michael L. Chabinyc
The ability to make flexible electronics enables us to envision new types of devices such as durable displays, implantable bioelectronics, and sensors seamlessly integrated in everyday items (1). Furthermore, the power and flexibility of organic chemistry to design new semiconductors has been a strong driver for an unprecedented effort in materials development worldwide (2). A key materials parameter is the mobility of charge carriers, which is often determined by building a field-effect transistor (FET) with the material. We outline why such measurements, which are indirect and depend on the appropriate use of device models, only provide apparent mobilities that can, in some cases, overstate the real values by more than an order of magnitude.
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