Optomechanical Mapping of Ferroelectric Domains and the Piezo?Photovoltaic Effect in Ba? and Ni?Doped (K _0.5 Na _0.5 )NbO ₃

The piezo-photovoltaic effect has been recently proposed as an analogy of the flexo-photovoltaic in noncentrosymmetric ferroelectrics that are also piezoelectric nature. It demonstrated to boost photovoltaic performance under applied uniaxial mechanical loads. impact on ferroelectric domains, however, not yet studied. In this context, a nanoscale insight into well optomechanical control domains novel bandgap-engineered ferroelectric, namely—KNBNNO ((K0.5Na0.5)NbO3–2 mol% Ba(Ni0.5Nb0.5)O3??), is provided. found force 1 ?N (pressure: 0.25 GPa) using scanning probe tip evinces 67% amplification piezoresponse material, and removing load, material retains 33% higher than pristine state. Mechanically induced property changes be strongly influenced by light illumination. Applied stress due atomic microscopy (AFM) highly nonuniform can induce additional polarization via flexoelectric which further enhances charge screening.