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Novel photo-voltaic device based on Bi1-xLaxFeO3 perovskite films with higher efficiency

Journal article
Authors Tmwj Bandara
Christopher Knee
Maurizio Furlani
Ingvar Albinsson
B. E. Mellander
Published in Journal of Materials Science-Materials in Electronics
Volume 30
Issue 2
Pages 1654-1662
ISSN 0957-4522
Publication year 2019
Published at Department of Chemistry and Molecular Biology
Department of Physics (GU)
Pages 1654-1662
Language en
Keywords sensitized solar-cells, low-cost, performance, deposition, nanoparticles, electrolyte, emergence, oxide, WJ (reprint author), Univ Peradeniya, Dept Phys, Peradeniya, Sri Lanka., Bandara, TMWJ (reprint, Engineering, Materials Science, Physics, egan b, 1991, nature, v353, p737
Subject categories Physical Sciences


Photovoltaic cells using polycrystalline La substituted bismuth iron oxide, Bi1-xLaxFeO3, (0.1x0.4), films as the light harvesting component were investigated in this work. A novel cell set-up utilizing a double layered TiO2 film as top contact and a thin layer of quasi-solid polymer electrolyte as back contact was used and a significant enhancement in cell efficiency was observed for assemblies based on x0.2 samples, coincident with a structural transition of Bi1-xLaxFeO3 from ferroelectric to non-ferroelectric. The power conversion efficiency of the PV device was 0.13% for the cell with x=0.2at 1 sun irradiation. The short circuit current density for this La composition was 0.35mAcm(-2). A hysteretic behaviour was observed for higher La compositions when the scanning is from open-circuit (OP) to short-circuit (SC) which may be attributed to polarization effects. The results at x0.2 show an improved performance with respect to BiFeO3 based systems, suggesting the stabilization of the non-ferroelectric crystal structure leads either to a more efficient separation of photo-generated electron-hole pairs and/or enhanced charge transport. The findings represent a step towards the realisation of facile to fabricate, inorganic solid state photovoltaic devices.

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