In the last number of the Journal of the European Ceramic Society you will find our recent work on the stabilization of Cr-modified BiFeO3 to reduce its bandgap for photovoltaic applications. As it is usually required high pressure to synthesize them, the key was the use of a novel strategy: introduce stress while crystallizating the film. And the results were good as you can read in the paper:

Stress-mediated solution deposition method to stabilize ferroelectric BiFe1-xCrxO3 perovskite thin films with narrow bandgaps
R. Jiménez, J. Ricote, I. Bretos, R.J. Jiménez Rioboó, F. Mompeán, A. Ruiz, H. Xie, M. Lira-Cantú, M.L. Calzada
Journal of the European Cerámic Society 41, 3404–3415 (2021)