Effects of Grain Size and Doping on Photovoltaic Current in (Pb1-xLax)TiO3 Ferroelectric Ceramics

Authors: S. KIM1; S. CHOI1

Source: Ferroelectrics Letters Section, Volume 31, Numbers 3-4, Numbers 3-4/2004 , pp. 63-72(10)

Publisher: Taylor and Francis Ltd

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Abstract:

The effects of grain size and doping on the photovoltaic current in (Pb1-xLax)TiO3 ceramics were investigated under uniform illumination. The effects are discussed on the basis of an electro-potential barrier associated with the grain boundary. Photo-excited electrons were trapped at the grain boundary and then built an electro-potential barrier, which impeded the movement of electrons. The maximum photovoltaic current was obtained at the critical grain size; the electro-potential barrier played a minimum role. By increasing the concentration of lanthanum, the critical grain size decreased.

Keywords: photovoltaic; ferroelectric; PLT; grain size

Document Type: Research article

DOI: 10.1080/07315170490480902

Affiliations: 1: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology 373-1, Kusung-dong Yusung-gu TaeJon 305-701 Korea

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