Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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A Study on the Pyroelectric Effects of $LiTaO_3$ Single Crystal by Using the Dynamic Method

Dynamic 방법을 이용한$ LiTaO_3$ 단결정의 초전특성에 대한 연구

  • 강성준 (여수대학교 반도체ㆍ응용물리학과) ;
  • 정양희 (여수대학교 전기공학과)
  • Published : 2003.06.01
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Abstract

The modulated frequency dependence on the pyroelectric properties of LiTaO$_3$ single crystal was investigated by the dynamic method. The pyroelectric coefficient of LiTaO$_3$ single crystal was 2.1${\times}$$10^{-8}$/$\textrm{cm}^2$ㆍK. and figure of merits for the responsivity and the detectivity were 1.31${\times}$$10^{-10}$Cㆍcm/J and 1.47${\times}$$10^{-8}$C\ulcornercm/J. respectively. The voltage responsivity corresponded with the pyroelectric voltage exhibited the highest value as about 165V /W at 4Hz and then was in inverse proportion to the frequency over 20Hz. The noise equivalent power and the detectivity at 4Hz were 8.4${\times}$$10^{-9}$ W/Hz$^{1}$2/ and 2.2${\times}$$10^{7}$ cmㆍHz$^{1}$2//W, respectively. Therefore, we could found that LiTaO$_3$ single crystal shows a excellent pyroelectric properties in low frequency region for the human body detection.tection.

Keywords

References

  1. S. Saito, Fine Ceramics, Ohmsha, pp. 34 (1987)
  2. S. T. Liu and D. Long, 'Pyroelectric Detectors and Materials', Proceedings of IEEE, vol. 66, pp.14-26 (1978) https://doi.org/10.1109/PROC.1978.10835
  3. R W. Astheimer, and F. Schwarz, 'Thermal Imaging Using Pyroelectric Detectors', Applied Optics, vol. 7, pp. 1687-1695 (1968) https://doi.org/10.1364/AO.7.001687
  4. C. B. Roundy, R. L. Byer, 'Subnanosecond Pyroelectric Detector', Applied Physics Letters, vol.21, pp. 512-515 (1972) https://doi.org/10.1063/1.1654239
  5. C. B. Roundy, R. L. Byer, 'Sensitive $LiTaO_3$ Pyroelectric Detector', Jounal of Applied Physics, vol. 44, pp. 929-931 (1973) https://doi.org/10.1063/1.1662294
  6. A. G. Chynoweth, 'Dynamic Method for Measuring the Pyroelectric Effect with Special Reference to Barium Titanate', J. Appl. Phys., vol.27, pp. 78 -84 (1956) https://doi.org/10.1063/1.1722201
  7. R C. Buchanan and J. Huang, 'Pyroelectric and Sensor Properties of Ferroelectric Thin Films for Energy Conversion', J. E. Ceram. Soc., vol 19, pp.1467-1471 (1999) https://doi.org/10.1016/S0955-2219(98)00454-3
  8. C. M. Wang, U. C. Chen and M. S. Lee, 'Pyroelectric Properties of La-modified Lead Titanate Thin Film Detectors', Jpn. J. Appl. Phsy., vol. 38, pp. 2831-2834 (1999) https://doi.org/10.1143/JJAP.38.2831
  9. Dong Hoon Chang, Seong Jun Kang and Yung Sup Yoon, 'Pyroelectric Properties of Pb0.9La0.1$TiO_3$ (PLT(10)) Thin Film on P-Doped Poly Silicon', Ferroelectrics, vol. 247, pp. 241-251 (2000) https://doi.org/10.1080/00150190008225008
  10. S. A. Hamid, 'Tourmalline as a Pyroelectric Infrared Radiation Detector', Zeitschrift für kristaIlographie, vol. 151, pp. 67-75 (1980) https://doi.org/10.1524/zkri.1980.151.1-2.67
  11. A. J. Moulson and J. M. Herbert, Electroceramics, Chapman & Hall, pp. 327 (1995)
  12. M. Kohli, C. Wuethrich, K Brooks, B. Wliing, M. Forster, P. Muralt, N. Setter and P. Ryser : Sens. & Actuat. A, vol. 60, pp. 147, (1997) https://doi.org/10.1016/S0924-4247(97)01484-2
  13. Dae Eun Cha, Dong Hoon Chang, Yung Sup Yoon and Seong Jun Kang, 'Frequency Dependence of the Dynamic Pyroelectric Properties of $Pb_{1-x}La_{x}Ti_{1-x/4}O_{3}$ (PLT) Ferroelectric Thin Films with Various La Concentrations', Journal of the Korean Physical Society, vol. 42, pp.288 - 293 (2003)
  14. R Takayama, Y. Tomita, K Lijima and I. Ueda, 'Preparation Characteristics of Pyroelectric Infrared Sensor Made of c-axis Oriented La-Modified Pb$TiO_3$ Thin Films', J. Appl. Phys., vol. 60, pp. 411-415 (1987)
  15. A. Rogalski, Infrared Detectors, Gordon and Breach Science Publishers, pp. 16 (2000)