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Pyroelectric Properties of the $\beta$-PVDF (Poly(vilnylidene fluoride)) Thin Film Prepared by Vacuum Deposition with Applying Electric Field  

Chang, Dong-Hoon (Shool of Electronic and Electrical Engineering, Inha Univ)
Kang, Seong-Jun (Dept. of Semiconductor and Applied Physics, Yosu National Univ.)
Yoon, Yung-Sup (Shool of Electronic and Electrical Engineering, Inha Univ)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.39, no.5, 2002 , pp. 23-30 More about this Journal
Abstract
The PVDF (Polyvinylidene Fluoride) thin film having P phase is prepared by the vacuum deposition with applying the electric field and its pyroelectric properties are studied by using a dynamic method to examine the possibility of the application to the pyroelectric IR sensor. The pyroelectric responses of the PVDF thin film are characterized as the frequency dispersion in both low and high modulation frequency regions, and their frequency dependences are observed. In the low frequency region (2~10Hzz), the polarization can easily rotate with the increase of modulation frequency and show the maximum since the reorientation rate of domains is higher than the modulation frequency. On the other hand, in the high frequency region (100~1000Hz), the pyroelectric response decreases as the frequency increases, because the reorienatation rate of domains is suppressed and thus, the change of polarization decreases. Pyroelectric coefficient, figure of merits for noise equivalent power and detectivity of the PVDF thin film are measured as 3.2$\times$10$^{-10}$ C/$\textrm{cm}^2$.K, 2.34$\times$10$^{-10}$ C.cm/J and 1.32$\times$10$^{-9}$ C.cm/J, respectively. Also, the noise equivalent and the detectivity are 1.66$\times$10$^{-7}$ W/H $z^{$\sfrac{1}{2}$}$, 6.03$\times$10$^{5}$ cm.H $z^{$\sfrac{1}{2}$}$W, respectively.
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