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ABSTRACT
LiTaO3 thin films were deposited by RF magnetron sputtering with a Li enriched target composed of Li2O2/Ta2O5 (55: 45 at %). LiTaO3 pyroelectric characteristics were studied with various gas compositions and with different bottom electrodes (RuO2 or Ru/RuO2). It can be seen that the LiTaO3 pyroelectric coefficient increases when the oxygen percentage decreases. Similar tests versus the back electrodes show the effect on pyroelectric properties of interface between LiTaO3 film and the bottom electrode. Ageing of pyroelectric coefficient are also presented and discussed. Finally, these results are compared with the pyroelectric coefficient values obtained with a stoichiometric target of Li2O2/Ta2O5 (50:50).
ACKNOWLEDGMENTS
The authors would like to thank V. Coronato, F. Cano, P. Pichot and J. Lionnet for their technical assistance.