Ferroelectricity and Rashba Effect in a Two-Dimensional Dion-Jacobson Hybrid Organic–Inorganic Perovskite

Hybrid
organic–inorganic perovskites (HOIPs) are a new generation
of high-performance materials for solar cells and light emitting diodes.
Beyond these applications, ferroelectricity and spin-related properties
of HOIPs are increasingly attracting interests. The presence of strong
spin–orbit coupling, allied with symmetry breaking ensured
by remanent polarization, should give rise to Rashba-type splitting
of electronic bands in HOIP. However, the report of both ferroelectricity
and Rashba effect in HOIP is rare. Here we report the observation
of robust ferroelectricity and Rashba effect in two-dimensional Dion-Jacobson
perovskites.