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Characterization of Sputtered Ge Film

Published online by Cambridge University Press:  15 February 2011

Jaeshin Cho
Affiliation:
Compound Semiconductor-1, Motorola Inc., Tempe, Arizona 85284
N. David Theodore
Affiliation:
Materials Research and Strategic Technologies, Motorola Inc., Mesa, Arizona 85202
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Abstract

The electrical resistivity and microstructure of sputtered germanium film were characterized as a function of anneal temperature from 400 to 700°C. The as-deposited sputtered Ge film had an amorphous structure with resistivity of 165 Ω-cm which was maintained after annealing up to 540°C. After annealing above 550°C, the resistivity dropped by almost four orders of magnitude to ∼0.027 Ω-cm. The sharp transition of resistivity at 550°C is believed to be due to the recrystallization of Ge film from the as-deposited amorphous structure. The ohmic contact property on Ge films was also evaluated using sputtered tungsten. Low resistance ohmic contacts were obtained both on as-deposited and annealed Ge films, with typical ohmic contact resistance of 0.05 ± 0.008 Ω-mm on annealed Ge films. The W contacts were thermally stable after annealing up to 650°C.

Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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References

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