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Effect of substrate temperature on the microstructure of thin niobium films

Sürgers, Christoph; Strunk, Christoph; Löhneysen, Hilbert von

Abstract:
Niobium films with constant thickness have been deposited on sapphire (1120) by electron-beam evaporation at different substrate temperatures (150 °C ⩽TS ⩽ 750 °C). The samples were characterized by X-ray diffraction and resistivity measurements. X-ray reflectivity shows that all films are covered with an oxide layer of about 20 Å in ambient atmosphere. The (110) texture at high \{TS\} decreases towards lower TS, accompanied by an increasing surface roughness. Below \{TS\} = 350 °C the grain size in the growth direction becomes smaller than the film thickness and a relaxation of intrinsic stress is observed. A transition from a columnar growth structure to a fine grained microstructure is inferred. The change of the microstructure with \{TS\} is probably due to the temperature dependent grain boundary mobility during the deposition process.


Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 1994
Sprache Englisch
Identifikator DOI: 10.1016/0040-6090(94)90107-4
ISSN: 0040-6090
KITopen ID: 259994
Erschienen in Thin solid films
Band 239
Heft 1
Seiten 51-56
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