The article points out that it's 1000x as efficient as a standard barium titanate PV panel. So this isn't comparing it to regular silicon panels.
Still, a real breakthrough.
Article has a link to the Science paper: https://www.science.org/doi/10.1126/sciadv.abe4206 "Strongly enhanced and tunable photovoltaic effect in ferroelectric-paraelectric superlattices | Science Advances"