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Laser Beam Lithography of Metal Oxide Electrodes for PZT Memory Applications

Published online by Cambridge University Press:  15 February 2011

Jarrod L. Norton
Affiliation:
Purdue University, School of Materials Engineering, West Lafayette, IN 47907-1289.
Said A. Mansour
Affiliation:
Purdue University, School of Materials Engineering, West Lafayette, IN 47907-1289.
G. L. Liedl
Affiliation:
Purdue University, School of Materials Engineering, West Lafayette, IN 47907-1289.
Arden L. Bement Jr.
Affiliation:
Purdue University, School of Materials Engineering, West Lafayette, IN 47907-1289.
Elliott B. Slamovich
Affiliation:
Purdue University, School of Materials Engineering, West Lafayette, IN 47907-1289.
C. Venkatraman
Affiliation:
Purdue University, School of Materials Engineering, West Lafayette, IN 47907-1289.
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Abstract

Current metal/metal oxide patterning techniques typically involve photolithography, an expensive, time-consuming process, and/or a vacuum system, which also adds significantly to the cost. In this study, fabrication of metal oxide upper electrodes for Pb(ZrxTi1-x)O3 (PZT) memories by metallorganic decomposition (MOD) was coupled with laser beam patterning. Metal oxide organic precursors were treated with an absorption-enhancing dye and were spun on to ferroelectric PZT films followed by selective area laser beam exposure. This technique was employed to pattern RuO2 and (La,Sr)CoO3 electrodes. A variety of patterns (dot, line, and circular) were prepared which demonstrates the suitability of laser patterning for a variety of applications. The minimum power density required to generate a continuous conductive oxide pattern was found to be approximately 2.5 kW/cm2 at a scan speed of 25 mm/min. Resistivity values for the patterned lines were 660 Ω-cm for RuO2 and 59 mΩ-cm for LSCO.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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