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A study on the Frequency Dependence of Dynamic Pyroelectric Properties for $Pb_{l-x}La_{x}Ti_{l-x/4}O_3$ (x=0.1) (PLT(10)) Ferroelectric Thin Film  

차대은 (인하대학교 전자재료공학과)
장동훈 (인하대학교 전자재료공학과)
강성준 (여수대학교 반도체ㆍ응용물리학과)
윤영섭 (인하대학교 전자재료공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.39, no.12, 2002 , pp. 1008-1015 More about this Journal
Abstract
The fabricated La-modified lead titanate (PLT) thin film without poling treatment was investigated for modulation frequency dependence of pyroelectric properties by the dynamic method. $Pb_{l-x}La_{x}Ti_{l-x/4}O_3$(x=0.1) (PLT(10)) thin film haying 10 mol% La content was deposited on a Pt/$TiO_{x}$/$SiO_2$/Si substrate by sol-gel method. The PLT(10) thin film exhibits a relatively excellent dielectric property. The pyroelectric coefficient (p) of the PLT(10) thin film is 6.6 x $10^{-9}C$$textrm{cm}^2$$.$K without frequency dependence. The figure of merits for the voltage responsivity and specific detectivity are 1.03 x $10^{-11}C$.cm/J and 1.46 x $10^{-10}C$.cm/J, respectively The PLT(10) thin film has voltage responsivity (RV) of 5.IS V/W at 8 Hz. Noise equivalent power (NEP) and specific detectivity ($D^{*}$) of the PLT(10) thin film are 9.93 x $10^{-8}$W/$Hz^{1/2}$ and 1.81 x $10^{6}$cm.$Hz^{1/2}$/W at the same frequency of 100 Hz,, respectively The results means that PLT thin film having 10 mol% La content is suitable for the sensing materials of pyroelectric IR sensors.
Keywords
PLT; pyroeletric; NEP; detectivity;
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