Optically controlled polarization, photovoltaic and switchable diode behavior in multifunctional KBiFe2O5 composite film

A Type‐II Heterostructure with a KBiFe2O5 Brownmillerite Core and a ZnO Nanoparticle Shell for Enhanced Optoelectronic Performance

“…[23,24] Recently, BiFeO 3 perovskite derivatives of KBiFe 2 O 5 (KBFO) brownmillerite structure (A 2 B 2 O 5 ) show great potential for the application of optoelectronic devices due to their low bandgap (∼ 1.6 eV) and high conductivity, theoretically reaching an efficiency of 30 %, compared to 7 % of BiFeO 3 . [23,[25][26][27][28] The reduced oxygen coordination and MO4 tetrahedral network structures offer smaller band gaps than conventional ferroelectrics, thus higher light absorption and carrier concentrations facilitating solar energy conversion. [23,29] KBFO shows a great response to sunlight as a photocatalyst to reduce industrial dyes compared to BiFeO 3 .…”