Photoresponsive ferroelectrics are recently under intense study due to their potential application to photovoltaic devices. Antimony sulfoiodide (SbSI) is a prototypical compound that possesses both ferroelectricity and a strong visible-light-response. However, most of the SbSI films reported so far have a polycrystalline structure with a randomly oriented polarization axis. In this study, we have fabricated c-axis textured SbSI thin films through annealing of amorphous films deposited in a molecular beam epitaxy system, employing Sb2S3 and SbI3 sources. The fabricated films are highly uniform and have the polarization axis ordered vertical to the film plane. We have confirmed that the films show a strong visible-light-response and ferroelectricity in accord with bulk samples. These results will stimulate the development of photovoltaics employing narrow bandgap ferroelectric compounds.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)