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diffusion transistor
A diffusion transistor is any transistor formed by diffusing dopants into a semiconductor substrate. Diffusion transistors include some types of both bipolar junction transistors and field-effect transistors. The diffusion process was developed later than the alloy junction and grown junction processes.
Bell Labs developed the first prototype diffusion transistors in 1954.〔(Transistor Museum, Historic Transistor Photo Gallery, Bell Labs Prototype Diffused Base Triode )〕
==Diffused-base transistor==
The earliest diffusion transistors were diffused-base transistors. These transistors still had alloy emitters and sometimes alloy collectors like the earlier alloy-junction transistors. Only the base was diffused into the substrate. Sometimes the substrate formed the collector, but in transistors like Philco's micro-alloy diffused transistors the substrate was the bulk of the base.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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