Measurement of high piezoelectric response of strontium-doped lead zirconate titanate thin films using a nanoindenter

被引:22
|
作者
Sriram, S.
Bhaskaran, M.
Holland, A. S.
Short, K. T.
Latella, B. A.
机构
[1] RMIT Univ, Microelect & Mat Technol Ctr, Sch Elect & Comp Engn, Melbourne, Vic 3001, Australia
[2] Australian Nucl Sci & Technol Org, Inst Mat & Engn Sci, Menai, NSW 2234, Australia
关键词
D O I
10.1063/1.2735407
中图分类号
O59 [应用物理学];
学科分类号
摘要
Strontium-doped lead zirconate titanate (PSZT) is reported to have a high piezoelectric coefficient (d(33)) in the range of 200-600 pm/V, when in the form of ceramic disks or pellets. This article reports piezoelectric response results for PSZT thin films deposited by rf magnetron sputtering on gold-coated silicon substrates. The compositions of the deposited thin films have been found to be uniform with depth, using secondary ion mass spectroscopy. The surfaces of the deposited thin films have been studied using an atomic force microscope and observed to be regular and nanostructured in nature. The piezoelectric response of the thin films, using the inverse piezoelectric effect, has been measured using a nanoindenter. Values of thin film d(33) up to 608 pm/V were obtained, which is much higher than previously reported values of d(33) for any thin film. The high values can be attributed to optimized deposition conditions and the low stress measured for the thin film arrangement on the substrate. The technique has been verified by obtaining a null response for silicon dioxide and by measuring d(33) values of similar magnitude for PSZT thin films using an atomic force microscope in the same testing arrangement. The piezoelectric response has been mapped to study variations across the thin film and with distance from the top electrode. (c) 2007 American Institute of Physics.
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页数:5
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