Epitaxial Pb(Zr,Ti)O 3 capacitors on Si by liquid delivery metalorganic chemical vapor deposition
Yang, S., B. Liu, J. Ouyang, V. Nagarajan, V.N. Kulkarni, Ramamoorthy Ramesh, J. Kidder, R. Droopad, K. Eisenbeiser
La 0.5Sr 0.5CoO 3/Pb(Zr x Ti 1-x )O 3/La 0.5Sr 0.5CoO 3 capacitors have been successfully fabricated by liquid delivery metalorganic chemical vapor deposition on Si wafers using SrTiO 3 thin layer (20 nm) as a template. Zr(dmhd) 4 in tetrahydrofuran was used as Zr precursor for compatible thermal behavior with Pb(thd) 2 and Ti(OiPr) 2(thd) 2 precursors. The dependence of the ferroelectric film composition on the precursor mixing ratio and growth temperature has been systematically studied by Rutherford Backscattering (RBS). Ferroelectric and piezoelectric properties at the composition close to morphotropic phase boundary region (Pb(Zr 0.5Ti 0.5)O 3) have been investigated for application in nonvolatile ferroelectric random access memories and microelectromechanical system (MEMS). These capacitors show desirable ferroelectric properties which proves that this approach is very promising for both fundamental study and potential applications. The changes of spontaneous polarization (P s ) and piezoelectric coefficient (d 33) with Ti/(Zr + Ti) ratio are also presented and compared with theoretical values. © 2005 Springer Science + Business Media Inc.
Journal of Electroceramics
Year of Publication