The stability of CsGeX3 (X=I, Br, Cl) selectively tuned by the crystal structures and halide ion inferred from the calculated phonon spectrum

In spite of the considerable advancements achieved in enhancing the power conversion efficiency (PCE) of lead-based all-inorganic perovskite solar cells, there persists a need for materials that are both more stable and environmentally friendly. This investigation systematically explores the structural and thermodynamic stability, and electronic properties of Ge-based all-inorganic perovskite CsGeX