Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The perovskites ABO3, with A and B cations of different valences, are multifunctional materials. Depending on their chemical composition they can behave very differently, showing properties specific to metals, dielectrics, ferroelectrics, ferro(ferri)magnetics or super- and semiconductors. Most of these materials are inorganic, such as well-known ferroelectrics BiFeO3 or Bi2FeCrO6 (BFCO). Since the discovery of the bulk photovoltaic (PV) effect in ferroelectrics, there has been a growing interest in perovskite materials for energy related applications, including PV and water splitting. In such materials, the spontaneous polarization-induced electric field promotes the required separation of photo-excited carriers and allows photovoltages higher than their bandgap, which lead to efficiencies that can exceed the maximum possible in a semiconductor p–n junction solar cells. Among these materials, Bi2FeCrO6 (BFCO) is highly promising because it exhibits a conversion efficiency of about 8.1% under 1 Sun illumination in thin film form. Other perovskites can be hybrid, if the cation A is replaced with an organic radical. This is the case for halide perovskite compounds (CH3NH3PbX), with X=Br, Cl, I, found recently to possess excellent light absorbing properties in the visible-near infrared spectrum. The use of these materials in solar cells had led to a rapid increased of the photovoltaic conversion efficiency (PCE) in the last year up to about 20 %. The combination of the relatively high PCE with the low cost technologies makes perovskite photovoltaic solar cells very attractive for future development. Here we review recent progress of our group in the exploration of perovskite materials – both thin film and nanostructures – in pursuit of two major research thrusts: Semiconducting perovskite and their energy-related applications. We will present, the controlled growth and characterization of BFCO thin films and nanostructures via pulsed laser deposition and physical vapor transport technique. The optimization of PV properties of such systems and the performance of their related devices will be also discussed.
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