Dielectric loss and related noise of pyroelectric modified lead titanate arrays

Electrical characteristics of pyroelectric modified lead titanate arrays we re measured at different temperatures. The modified lead titanate films wer e deposited by metal-organic decomposition. Dielectric loss tangent (tans) as low as 0.045 at 30 Hz was obtained at room temperature with lanthanum ni ckel oxide electrodes. For the purpose of this study, micromachined 40 x 40 mum(2) pixels made of 200-nm-thick pyroelectric films were connected in pa rallel into 10- or 100-pixel arrays. Noise measurements showed the temperat ure and frequency dependence of tan delta noise to coincide with the calcul ated results, At room temperature, the best 10-pixel array showed a tan del ta noise current as low as 2 x 10(-15) A/Hz(1/2) at the operating frame rat e of 30 Hz, As expected, 1/f noise was observed proportional to applied cur rent when the pixels were dc biased. (C) 2001 Published by Elsevier Science Ltd.