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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

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