Journal Article organic semiconductors 2D materials organic field-effect transistors 2D Review active matrix array devices crystalline films high-k dielectric optical images optical memory transistors organic crystalline films organic crystals organic electronics organic field-effect transistor organic field‐effect transistor organic optoelectronics organic single crystals organic transistors patterning phototransistors screen printing single crystals solution process steep switching structural inhomogeneity temperature-sensor arrays ultralow voltage visual adaption