The first Transistor
The first Transistor
The first Transistor
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NPN Bipolar <strong>Transistor</strong><br />
Planar junction (Bipolar) transistor<br />
Emitter<br />
Base<br />
Collector<br />
Al•Cu•Si<br />
SiO 2<br />
n p n<br />
p +<br />
+<br />
+ n-epi<br />
Electron flow<br />
n + buried layer<br />
P-substrate<br />
p +<br />
7<br />
Cross sections of BJTs<br />
[R. F. Robert, Semiconductor Device Fundamentals, Addison Wesely, 1996]<br />
A typical discrete,<br />
double-diffused pnp BJT<br />
An IC npn BJT<br />
8<br />
4