Novel photo-voltaic device based on Bi_{1−x}La_xFeO_3 perovskite films with higher efficiency
Journal article, 2019

Photovoltaic cells using polycrystalline La substituted bismuth iron oxide, Bi1−xLaxFeO3, (0.1 ≤ x ≤ 0.4), 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 x ≥ 0.2 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 = 0.2 at 1 sun irradiation. The short circuit current density for this La composition was 0.35 mA cm−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 x ≥ 0.2 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.


T M W J Bandara

Chalmers, Physics

University of Peradeniya

Christopher Knee

Chalmers, Chemistry and Chemical Engineering, Energy and Material


Maurizio Furlani

University of Gothenburg

Ingvar Albinsson

University of Gothenburg

Bengt-Erik Mellander

Chalmers, Physics, Subatomic and Plasma Physics

Journal of Materials Science: Materials in Electronics

0957-4522 (ISSN) 1573-482X (eISSN)

Vol. 30 2 1654-1662

Subject Categories

Inorganic Chemistry

Materials Chemistry

Condensed Matter Physics



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