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Photovoltaic effect of Sn2P2S6 ferroelectric crystal and ceramics

Published online by Cambridge University Press:  31 January 2011

Y. W. Cho ,
S. K. Choi  and
Yu. M. Vysochanskii
Y. W. Cho
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusung-dong Yusung-gu, Taejon 305-701, South Korea
S. K. Choi
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusung-dong Yusung-gu, Taejon 305-701, South Korea
Yu. M. Vysochanskii
Affiliation:
Institute of Solid State Physics & Chemistry of Uzhgorod State University, 294000 Uzhgorod, Ukraine
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Abstract

To investigate the photovoltaic effect in Sn2P2S6 ferroelectrics, Sn2P2S6 crystal and ceramic sample that had a high relative density of 95% and a grain size of below 1 μm were fabricated. The steady-state photovoltaic currents under infrared light illumination on both Sn2P2S6 crystal and ceramic sample were observed for the first time. The photovoltaic currents ipv on Sn2P2S6 ceramic sample and crystal were 5 and 25 nA/cm, respectively. The difference in the magnitude of the photovoltaic current resulted from the difference in the remanent polarization Pr between the crystal and the ceramic sample. The values of the photovoltaic field Epv determined from I–V curve for Sn2P2S6 ceramic sample and crystal were 0.2 and 6 V/cm, respectively; these values were several orders lower than that observed on the perovskite-type ferroelectric ceramics. The photovoltaic fields observed in this study were discussed with the conductivity of the crystal and the ceramic sample, in consideration of the figure of merit for the photostriction.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 11 , November 2001 , pp. 3317 - 3322
Copyright
Copyright © Materials Research Society 2001

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