Cover Image, Volume 5, Number 6, June 2023

Front cover image: Perovskite oxide ferroelectric materials are promising candidates for self-powered photodetectors. However, these materials are bulky and suffer from slow rise and fall times together with low responsivity. In article number 10.1002/cey2.297, J. P. B. Silva et al. design a very promising ultrafast photodetector for violet light based on a stable thin film inorganic perovskite oxide ferroelectric material, which exploits photovoltaic and pyroelectric effects. The proposed heterostructure have strong responsivities and rise and fall times of only a few microseconds, which are more than thirty thousand times faster than a device based on the same material in bulk ceramic form. The results are understood based on the ferro-pyro-phototronic effect where the polarization-dependent interfacial coupling can greatly influence the photodetector performance.