| Brattain
tried to achieve a metal-insulator-semiconductor that would allow the
amplification of a signal effectively. The idea was simple: applying a
positive voltage to electrode metal should have been able to attract
electrons in the semiconductor, taking the external circuit. The
strength of the semiconductor would fall due and therefore increase
electricity: it would be able to obtain amplification of the signal
applied to electrode metal. The device non Did not work. The device did
not work. Bardeen said the explanation of failure: the electrons were
actually drawn in germanium and Thickened the surface where they
remained trapped but because of the poor quality of the surface itself,
ruined by cutting and processing. The idea, however, was
completely valid and today is the basis of a whole family of devices:
'effect transistor field.
Experimentation continued, an experimental error
led to the discovery
of amplification tried, though not by the structure required. During
the cleaning of germanium crystal was removed the thin layer of
insulation and contact metal was then carried out directly on the
semiconductor, and this gave rise to a new result that was carefully
considered and not just dismissed, as the result of an error.
Were applied to the two metal contacts germanium pointed very close:
the intensity of the current circulating between the two points and
third mass contact increased to the point where a voltage was applied.
Also, a modulated signal sent to one of two points appeared to
amplified: thus obtained had the effect of amplification of electrical
signals modulated long sought.
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