Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
A ferroelectric perovskite oxide (FEPO) based-solar cell design has recently emerged as a potential alternative to conventional PV technologies. Unlike traditional PV cells, they provide unique routes to spontaneously separate charge carriers achieving extremely large, above band gap open-circuit voltages by a single phase material, abnormal photovoltaic effect (APV). Most ferroelectric oxides have band gaps in the range of 2.7-5 eV, which allow the use of less than 8-20% of the solar spectrum, and show PV currents orders of magnitude lower than traditional PV cells, which have thus far prevented a wider impact (efficiencies < 1%). Enhancing the APV effect in FE perovskite oxide materials by judicious engineering of the bandgap offers unprecedented opportunities for this class of materials to build PV devices with increased power conversion efficiency. BiFeO3-BiCoO3 (BFCO) solid solutions are very appealing compositions using abundant and non toxic elements. In addition, they offer large variations in crystal symmetry, polarity, magnetic, and ferroelectric properties. Also, it is predicted that band gaps close to 1 eV could be achieved for the pure BiCoO3 phase. However, most of these compositions can only be prepared at high-pressure high-temperature conditions and with low Co content. Advances in thin-film growth techniques provide routes to structures and phases that are inaccessible by traditional deposition methods and allow the properties of existing materials to be modified.Here we demonstrate the feasibility of chemical methodologies to prepare epitaxial BFCO thin films with Co concentrations up to 70%. The influence of Co incorporation on the film structure has been evaluated by x-ray diffraction and scanning transmission electron microscopy. Also, by means of spectroscopic ellipsometry it has been identified variations in the band gap towards visible-light range, from 2.7 to 1.4 eV by increasing the Co concentration.
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