Langmuir-Blogett monolayer transistors of copper phthalocyanine

Bottom-contact monolayer thin-film transistors (MTFTs) were fabricated using copper phthalocyanine (CuPc) Langmuir-Blodgett monolayer as the active channel. The devices with tens of micrometers long channels showed typical p-type field-effect properties and obvious saturation regimes. Mobilities of these CuPc MTFTs were channel length dependent. The best performance obtained from the molecule-scaled CuPc MTFT with a channel length of 5 mu m showed mobility even higher than that of the 50 nm thick vacuum-deposited films. These MTFTs may find potential applications in sensors and organic integrated circuits.