The processing characteristics of organic semiconductors make them potentially useful for electronic applications where low-cost, large area coverage and structural flexibility are required. This critical review gives a general introduction about the current standing in the area of OFETs focusing on the new processable small molecules that have been recently reported for their use as organic semiconductors. A general description of the OFETs device operation and the transport mechanisms that dominate organic semiconductors is provided, followed by an overview of the strategies and materials employed to fabricate p-type, n-type and ambipolar OFETs. Some new tendencies and applications that are currently being developed employing OFETs are also described, such as the preparation of electronic paper, sensors or light emitting transistors (85 references).

Great interest in organic field-effect transistors (OFETs) has emerged in the last years due to their potential applications. Here we highlight the very recent use of tetrathiafulvalene derivatives for fabricating OFETs either from vacuum deposition or from solution. These materials are extremely promising owing to their facile processability and high device performance.