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Thin-film transistor
A
thin-film transistor
(
TFT
) is a special kind of
field-effect transistor
made by depositing
thin films
of an active
semiconductor
layer as well as the
dielectric
layer and
metallic
contacts over a supporting (but non-conducting)
substrate
. A common substrate is
glass
, because the primary application of TFTs is in
liquid-crystal displays
. This differs from the conventional
transistor
, where the semiconductor material typically
is
the substrate, such as a
silicon wafer
.
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