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Organic semiconductors (OSCs) are the key components of organic electronic devices. In conventional organic field-effect transistors (OFETs), thick organic semiconductor films (tens of nanomter) are adopted. It is known that the conductive channel (one to several molecular layers, several nanometers thick) in OFETs is located at the interface between OSCs and dielectrics, and is generally buried in the thick OSCs film, which renders some difficulties for the characterization of conductive channel and realization of high performance sensors.