Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Inorganic thin film photovoltaics (PV) are mainly based on CdTe, amorphous Si or CIGS. In the most recent times, hybrid organo-metal halide perovskites have emerged with the highest conversion efficiencies reported of 20.1 %. However, these materials present stability, reliability, scalability and toxicity problems. Of course, research in this area is focusing hard on these challenges, but success is not guaranteed. Alternative inorganic oxides could offer significant advantages.
Ferroelectric oxides are currently providing the highest efficiency among all all-oxide solar cells [1]. Yet the mechanisms are still not well understood and there are several materials and engineering issues to be tackled. For instance, cheap and scalable methods need to be proposed for possible industrial applications. The ideal bandgap of an active photovoltaic layer for the solar spectrum is around 1.3 eV. However oxides with low bandgaps are scarce.
In this work we investigate several ferroelectric systems such as BiMnxOy, Bi2FeCrO6, and doped TbMnO3, grown by pulsed laser deposition and sol-gel techniques. We will show how they can be optimized for solar cell applications and which characterizations techniques can be used to tune their photovoltaic properties.
[1] R. Nechache et al., Nature Phot. 9, 61 (2015).
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