The effect of electric current and surface oxidization on the growth of Sn whiskers

Title
The effect of electric current and surface oxidization on the growth of Sn whiskers
Authors
김경섭양준모안재평
Keywords
soldering; TEM; surface oxidation; Sn whisker; Tin whisker; Current; Tin oxide; Intermetallic compounds; Transmission electron microscopy
Issue Date
2010-09
Publisher
Applied surface science
Citation
VOL 256, NO 23, 7166-7174
Abstract
Electric current was applied on pure Sn-plated leadframes to evaluate the effects of current-induced stress on the growth of Sn whiskers. The samples were stored at room temperate and 55 ℃/85% relative humidity (RH) conditions with an induced current range of 0.1 A to 0.5 A. The samples stored at the room temperature did not grow the whiskers at any of the current conditions until 3000 hrs. As the current flow increased, irregular intermetallic compounds (IMCs) grew at the interface between the Sn finish and Cu substrate. However, various lengths of columnar and bent whiskers were observed under all current conditions, after exposure to 55 ℃/85% RH conditions for 1000 hours. At the same temperature, the higher current levels showed longer whiskers than lower current levels. The Sn oxide had the α-SnO2 structure of the rutile phase which was non-uniformly formed on the surface of the Sn finish. The grain size of the SnO2 was estimated to be several nanometers. The SnO2 film was up to a thickness of ∼23 nm on the Sn whisker surface stored at 55 ℃/85% RH conditions for 3000 hours.
URI
http://pubs.kist.re.kr/handle/201004/37649
ISSN
0169-4332
Appears in Collections:
KIST Publication > Article
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