Abstract
We calculate the component of the photovoltage in bismuth ferrite that is generated by ferroelectric domain walls, using first-principles methods, in order to compare its magnitude to the experimentally measured photovoltage. We find that excitons at the ferroelectric domain walls form an electric dipole layer resulting in a domain-wall driven photovoltage. This is of the same order of magnitude as the experimentally measured one, but only if the carrier lifetimes and diffusion lengths are larger than previously assumed.
- Received 13 June 2019
- Revised 27 June 2020
- Accepted 9 August 2020
DOI:https://doi.org/10.1103/PhysRevB.102.081304
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