•Discovered compositionally complex perovskite oxides (CCPOs) as solid electrolytes•Compositionally designs can outperform conventional doping•Demonstrated grain-boundary-enabled conductivity improvements The recent emergence of high-entropy ceramics and a broader class (CCCs) unlocks vast compositional spaces for materials discovery. This study proposes demonstrates strategies tailoring CCCs v...

This work reports the growth of crystalline SrHfxTi1−xO3 (SHTO) films on Ge (001) substrates by atomic layer deposition. Samples were prepared with different Hf content x to explore if strain, from tensile (x = 0) to compressive (x = 1), affected film crystallization temperature and how composition affected properties. Amorphous films grew at 225 °C and crystallized into epitaxial layers at ann...