BaTiO3 doped Na0.5K0.5NbO3 thin films deposited by using eclipse shutter enhanced pulsed laser deposition method.
We have investigated structural, electrical, and electro-mechanical properties of lead-free piezoelectric BaTiO3 doped Na0.5K0.5NbO3 (BTO-NKN) thin films deposited by pulsed laser deposition (PLD) methods. BTO-NKN thin films have been deposited on La0.5Sr0.5CoO3 (LSCO) bottom electrodes with LaAlO3 (LAO) substrates. X-ray diffraction data have shown that all the BTO-NKN and bottom electrodes are highly oriented with their c-axes normal to the substrates. In order to improve the morphology of BTO-NKN thin films, we have located an eclipse shutter between a target and a substrate. Root-mean-square roughness was changed from 91 nm to 21 nm with eclipse shutter enhanced PLD (E-PLD) method. Furthermore, the enhanced surface morphology leads to the improvement in electrical or electro-mechanical properties mainly due to increased density. Typical capacitance and d33 values of a BTO-NKN film deposited by E-PLD method are 1000 pF and 30 pmN, respectively.
Choi
J S
JS
Department of Physics, Konkuk University, Seoul 143-701, Korea.
Hwang
I R
IR
Hong
S H
SH
Oh
G T
GT
Choi
J A
JA
Jeon
S H
SH
Kang
S O
SO
Yalishev
Vadim Sh
VSh
Park
B H
BH
Choi
Chang-Hak
CH
Ahn
Cheol-Woo
CW
Nahm
Sahn
S
Ahn
Sang Jun
SJ