Organic semiconductors, a class of carbon-based materials with optical and electronic properties, are now commonly used to fabricate a variety of devices, including solar cells, light-emitting diodes and field-effect transistors. These semiconducting materials can exhibit a characteristic known as highly unipolar charge transport, which essentially means that they predominantly conduct either electrons or holes. This can be somewhat problematic, as it hinders their efficiency and performance.
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Source: Phys.org