Giant photovoltaic effect of ferroelectric domain walls in perovskite single crystals

Ryotaro Inoue, Shotaro Ishikawa, Ryota Imura, Yuuki Kitanaka, Takeshi Oguchi, Yuji Noguchi, Masaru Miyayama
  • Scientific Reports, October 2015, Springer Science + Business Media
  • DOI: 10.1038/srep14741

Large photovoltaic response at the domain walls in ferroelectrics

What is it about?

In this article, we provide the first direct evidence of an unusually large PV response induced by ferroelastic DWs—termed ‘DW’-PV effect. The precise estimation of the bulk PV tensor in single crystals of barium titanate enables us to quantify the giant PV effect driven by 90° DWs. We show that the DW-PV effect arises from an effective electric field consisting of a potential step and a local PV component in the 90° DW region.

Why is it important?

The photovoltaic (PV) effect in polar materials offers great potential for light-energy conversion that generates a voltage beyond the bandgap limit of present semiconductor-based solar cells. Ferroelectrics have received renewed attention because of the ability to deliver a high voltage in the presence of ferroelastic domain walls (DWs). In recent years, there has been considerable debate over the impact of the DWs on the PV effects, owing to lack of information on the bulk PV tensor of host ferroelectrics.

Perspectives

Dr Ryotaro Inoue
Nihon University

This work offers a starting point for further investigation into the DW-PV effect of alternative systems and opens a reliable route for enhancing the PV properties in ferroelectrics based on the engineering of domain structures in either bulk or thin-film form.

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http://dx.doi.org/10.1038/srep14741

The following have contributed to this page: Dr Ryotaro Inoue

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