On the influence of annealing on the compositional and crystallographic properties of sputtered Li-Al-O thin films
arxiv(2024)
摘要
A Li-Al-O thin film materials library, deposited by inert magnetron
sputtering and post-deposition annealing in O2 atmosphere, was used to study
the effects of different annealing temperatures (300 to 850C) and
durations (1 min to 7 h) on crystallinity and composition of the films. XPS
depth profiling revealed inhomogeneous compositional depth profiles with Li
contents increased toward the film surface and Al contents toward the
film-substrate interface. These depth profiles were confirmed by a combination
of RBS and D-NRA. At annealing temperatures of 550C and higher, Li
reacted with the Si substrate. At the same time, temperatures of 550C and
higher enabled the formation of crystalline LiAlO2, whereas at lower
temperatures, no crystalline Li-Al-O phases were detected with XRD. In contrast
to conventional annealing in a tube furnace (3 to 7 h durations), rapid thermal
annealing with fast heating/cooling rates of 10C/min and durations of 1
to 10 min resulted in homogeneous depth profiles, while also leading to
crystalline LiAlO2.
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