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Robust Unipolar Electron Conduction Using an Ambipolar Polymer Semiconductor with Solution-Processable Blends
journal contribution
posted on 2020-08-07, 11:34 authored by Michael J. Ford, Mitsuharu Suzuki, Colin R. Bridges, Karen C. Bustillo, Martin Seifrid, Ming Wang, Hiroko Yamada, Thuc-Quyen Nguyen, Guillermo C. BazanAmbipolar polymer
semiconductors are among the most ubiquitous
semiconductors used for high-mobility organic field-effect transistors.
However, since ambipolar polymer semiconductors are capable of conducting
both holes and electrons in typical organic-field effect transistor
architectures, these devices never reach a well-defined off-state,
limiting wide use in low-power complementary devices. By using solution-processable
tetrabenzoporphyrin derivatives that block hole conduction, we show
that it is possible to improve on/off ratios by 3–4 orders
of magnitude for an ambipolar polymer semiconductor. The ability to
block hole conduction is dependent on processing conditions, namely,
thermal annealing. An in-depth study of device architectures and morphology
using grazing incidence wide-angle X-ray scattering, atomic force
microscopy, and electron microscopy suggests that morphology plays
a key role in the ability of the additional component to block hole
conduction, and tetrabenzoporphyin derivatives can be sensitive to
thermal annealing conditions. By using alkylated tetrabenzoporphyrins,
high on/off ratios that are resilient to thermal annealing are possible.
This study presents a widely applicable route to high mobility n-channel
organic field-effect transistors, which are required for efficient
logic circuits.
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organic-field effect transistor arc...ambipolar polymer semiconductorsmorphologyabilityratioblock hole conductionfield-effect transistorsRobust Unipolar Electron Conductionambipolar polymer semiconductorSolution-Processable Blends Ambipol...incidence wide-angle X-rayelectronAmbipolar Polymer Semiconductordevicesolution-processable tetrabenzoporp...microscopyannealing
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