For TFTs with solution-processable organic semiconductors (OSCs), in particular, heterointerface engineering can be more deleterious because it should be compatible with printing technology 8, 9. TFT manufacturing processes require sequential deposition of these components, which is likely to hamper the reliable production of integrated devices. Thin-film transistors (TFTs) are one of the most important building blocks of electronic circuits 1, 2, 3, where heterointerfaces between various components such as metals, semiconductors, and insulators play predominant roles in their performance 4, 5, 6, 7. These results constitute a key step forward in the further development of printed metal-free integrated circuits. We also demonstrate two significant milestones from the viewpoint of material science: a complementary circuit, an inverter consisting of p- and n-type OTFTs, and an operatable metal-free OTFT composed of fully carbon-based materials. The present OTFTs exhibited reasonably high field-effect mobilities of up to 11 cm 2 V −1 s −1 for p-type and 1.4 cm 2 V −1 s −1 for n-type with no significant deterioration during electrostatic spray processes. In this study, we demonstrate that graphite-based carbon electrodes can be deposited and patterned directly onto an organic single-crystalline thin film via electrostatic spray coating.
However, OTFTs use noble metals, such as gold, as electrodes, which has been a bottleneck in terms of cost reduction and low environmental loading. Similar to inorganic FETs, OTFTs are heterostructures consisting of metals, insulators, and semiconductors, in which nanoscale interfaces between different components should be precisely engineered. Organic thin-film transistors (OTFTs) are promising building blocks of flexible printable electronic devices.
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