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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3495

Title: Non-linear resistance behavior in the early stages and after electromigration in Al-Si lines.
Authors: Scorzoni, A
De Munari, I
Stulens, Herwig
D'Haeger, V
Issue Date: 1996
Publisher: AMER INST PHYSICS
Citation: JOURNAL OF APPLIED PHYSICS, 80(1). p. 143-150
Abstract: A common result obtained in electromigration experiments carried out on Al-Si lines using different high resolution resistometric methods, is a monotonous non-linear resistance increase at the very beginning of the high current electromigration test, and a decrease after the high stressing current is switched off. These effects have often been attributed to the attainment of a steady state of vacancy concentration during and after electromigration. This paper shows how even small abrupt temperature steps, always present at the beginning and after electromigration tests, are the triggering events for different, often reversible, physical phenomena contributing to non-linear resistance changes. Precipitation-dissolution of alloyed elements appears to be the most significant one. Abrupt temperature changes also induce a change of the hydrostatic stress of passivated lines. The relaxation of the hydrostatic stress could be coupled with a void volume change, and the total resistance is a function of both the hydrostatic stress (through resistivity) and of void volume. However, we demonstrate that in our experiments the effect of hydrostatic stress relaxation on resistance variations is negligible with respect to the action of precipitation-dissolution. These non-linear, thermally induced effects, however, do not exclude possible simultaneous resistance changes due to the accumulation/relaxation of the electromigration damage. Experimental results are collected by means of different, complementary techniques. (C) 1996 American Institute of Physics.
Notes: LIMBURGS UNIV CENTRUM,DIV MAT PHYS,MAT RES INST,B-3590 DIEPENBEEK,BELGIUM.Scorzoni, A, CNR,IST LAMEL,VIA P GOBETTI 101,I-40129 BOLOGNA,ITALY.
URI: http://hdl.handle.net/1942/3495
DOI: 10.1063/1.363552
ISI #: A1996UU53200021
ISSN: 0021-8979
Type: Journal Contribution
Appears in Collections: Research publications

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