A transistor whose active semiconductor channel is a thin film on a supporting substrate. Semiconductor purity, channel continuity, gate dielectric and contacts jointly determine switching; a high intrinsic charge carrier mobility alone does not guarantee a uniform transistor array.
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A thin-film transistor (TFT) is a type of field-effect transistor that is characterized by its thin film of semiconductor material. TFTs are used primarily in display technologies, notably in liquid crystal displays (LCDs) and organic light-emitting diode (OLED) displays.