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- W2051010310 abstract "Results are reported of an investigation of the electrical properties of Ge films evaporated on Duran glass at different substrate temperatures TS. The resistivity measurements allow to distinguish between amorphous and polycrystalline films on account of a steep resistivity step of four or seven orders of magnitude at 294 or 80 K lattice temperature, respectively as found at TST = 135°C. This step is due to the fact that with the relatively high evaporation rate used, grains of only equal size are performed, and that with decreasing TS at TST all grains fall below a critical grain size. By the analysis of the lattice temperature dependence of the resistivity of the polycrystalline films, making use of the mean free path of carriers between two collisions at grain boundaries, the critical grain size was found to be about an elementary cell. Es wird über ergebnisse einer Untersuchung der elektrischen Eigenschaften von Ge-Filmen berichtet, die bei verschiedenen Substrattemperaturen TS auf Duranglas aufgedampft wurden. Mit den Widerstandsmessungen kann zwischen amorphen und polykristallinen Schichten unterschieden werden, weil bei TST = 135°C ein steiler Sprung des spezifischen Widerstandes um vier bzw. sieben Zehnerpotenzen bei 294 bzw. 80 K Gittertemperatur auftritt. Dieser Sprung ist dadurch bedingt, daß bei der verwendeten relativ hohen Aufdampfrate nur Körner gleicher Größe entstehen und mit abnehmendem TS bei TST alle Körner eine kritische Korngröße unterschreiten. Durch die Analyse der Gittertemperaturabhängigkeit des spezifischen Widerstandes der polykristallinen Schichten wird anhand der mittleren freien Weglänge der Ladungsträger zwischen zwei Stößen an Korngrenzen gefunden, daß diese kritische Korngröße etwa die der Elementarzelle ist." @default.
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- W2051010310 date "1973-03-16" @default.
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- W2051010310 title "Structure change and resistivity step of evaporated Ge films in dependence on the substrate temperature" @default.
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