The recently discovered anomalous photovoltaic effect in ferroelectrics is attracting considerable attention of specialists in ferroelectricity and solid-state physics. The anomalous nature of the effect is manifested by the fact that the photo-emf developed in ferroelectrics and pyroelectrics is many orders of magnitude greater than the band gap and can reach 10$^3$--10$^5$V. The anomalous photovoltaic effect in ferroelectrics has found extensive applications in volume phase holography. A review is given of the experimental investigations of the anomalous photovoltaic effect in ferroelectrics and also of the models proposed to explain this effect.

@article{Fridkin:1978,
	author = {V. M. Fridkin and B. N. Popov},
	title = {Anomalous photovoltaic effect in ferroelectrics},
	publisher = {Physics-Uspekhi},
	year = {1978},
	journal = {Phys. Usp.},
	volume = {21},
	number = {12},
	pages = {981-991},
	url = {https://ufn.ru/en/articles/1978/12/a/},
	doi = {10.1070/PU1978v021n12ABEH005722}
}