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.

Author

T M W J Bandara

Chalmers, Physics

University of Peradeniya

Christopher Knee

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

ESAB

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

DOI

10.1007/s10854-018-0436-8

More information

Latest update

6/11/2019