Neutron Transmutation Doping

Neutron Transmutation Doping

Neutron Transmutation Doping (NTD, ins deutsche übersetzt etwa: Neutroneninduzierte Umwandlungsdotierung) ist ein Verfahren, um in Silizium höchst homogene Phosphordotierungen zu erreichen. Dazu wird das Silizium mit thermischen Neutronen beschossen. Es ergibt sich folgende Kernreaktion:

{}^{30}\mathrm{Si}+\mathrm{n}\rightarrow{}^{31}\mathrm{Si}\xrightarrow{\beta^--\mathrm{Zerfall}}{}^{31}\mathrm{P} + \beta^- + \bar{\nu}

Das stabile Isotop 30Si tritt in der Natur mit einem Anteil von 3,1 % auf. Daher kann mit der NTD-Methode eine hohe Phosphordotierung von bis zu 1020cm − 3 erreicht werden.

Literatur

  • Rolf Sauer: Halbleiterphysik: Lehrbuch für Physiker und Ingenieure. Oldenbourg, 2009, ISBN 348658863X.

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