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{{refimprove|date=February 2011}}{{Short description|type of transistor}}
A '''diffused junction transistor''' is a transistor formed by diffusing [[dopant]]s into a [[semiconductor]] [[Wafer (electronics)|substrate]]. The diffusion process was developed later than the [[Alloy-junction transistor|alloy junction]] and [[Grown-junction transistor|grown junction]] processes for making bipolar junction transistors (BJTs).
[[Bell Labs]] developed the first prototype diffused junction bipolar transistors in 1954.<ref>[http://semiconductormuseum.com/PhotoGallery/PhotoGallery_Prototype_DiffusedBase.htm Bell Labs Prototype Diffused Base Triode], Transistor Museum, Historic Transistor Photo Gallery.</ref>
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