%0 Generic %1 korbel2019photovoltage %A Körbel, Sabine %A Sanvito, Stefano %D 2019 %K BiFeO3 domain_walls excitons ferroelectric_photovoltaics myown theory %T Photovoltage from ferroelectric domain walls in BiFeO$_3$ %U http://arxiv.org/abs/1905.10321 %X It has been debated for a decade whether the photovoltage in BiFeO$_3$ originates in a bulk photovoltaic effect, a ferroelectric domain-wall effect, or a combination of both. In order to elucidate the role of ferroelectric domain walls for the photovoltaic effect in BiFeO$_3$, we calculated the photovoltage of a single ferroelectric domain wall stemming from photo-generated electron-hole pairs residing at the ferroelectric domain wall, using first-principles calculations based on density-functional theory. We find that at the ferroelectric domain walls the electron-hole pairs form an electric dipole layer resulting in a saw-tooth shaped electronic potential, hence creating a domain-wall driven voltage upon illumination. This domain-wall driven photovoltage in BiFeO$_3$ is smaller than the experimentally measured photovoltage for light intensities up to several tens of mW/cm$^2$, indicating that bulk effects, not domain-wall effects, dominate the photovoltaic effect in BiFeO$_3$ in this intensity range.

@misc{korbel2019photovoltage, abstract = {It has been debated for a decade whether the photovoltage in BiFeO$_3$ originates in a bulk photovoltaic effect, a ferroelectric domain-wall effect, or a combination of both. In order to elucidate the role of ferroelectric domain walls for the photovoltaic effect in BiFeO$_3$, we calculated the photovoltage of a single ferroelectric domain wall stemming from photo-generated electron-hole pairs residing at the ferroelectric domain wall, using first-principles calculations based on density-functional theory. We find that at the ferroelectric domain walls the electron-hole pairs form an electric dipole layer resulting in a saw-tooth shaped electronic potential, hence creating a domain-wall driven voltage upon illumination. This domain-wall driven photovoltage in BiFeO$_3$ is smaller than the experimentally measured photovoltage for light intensities up to several tens of mW/cm$^2$, indicating that bulk effects, not domain-wall effects, dominate the photovoltaic effect in BiFeO$_3$ in this intensity range.}, added-at = {2019-05-27T11:35:55.000+0200}, author = {Körbel, Sabine and Sanvito, Stefano}, biburl = {https://www.bibsonomy.org/bibtex/21ba74658baf5ff6848df92a43eb090b1/skoerbel}, description = {Photovoltage from ferroelectric domain walls in BiFeO$_3$}, interhash = {21f9c9983c369216aa2fc63e515e671e}, intrahash = {1ba74658baf5ff6848df92a43eb090b1}, keywords = {BiFeO3 domain_walls excitons ferroelectric_photovoltaics myown theory}, note = {cite arxiv:1905.10321}, timestamp = {2019-05-27T11:35:55.000+0200}, title = {Photovoltage from ferroelectric domain walls in BiFeO$_3$}, url = {http://arxiv.org/abs/1905.10321}, year = 2019 }