BiVO4 Calcium PMNPT University_of_Regensburg TipBiasMode Photovoltaics Tungsten HanyangUniv block_copolymer Hexacontane Formamidinium_lead_iodide Nanofiber Jason LFM Piezoresponse Optoelectronic Nanotechnology mono_layer Conducting DeflectionOptics TCS margarine Croatia MultiferroicMaterials ShenYang ScanningIon-ConductanceMicroscopy Film Wang DIWafer Organic Calcite BCZT NUS MechanicalProperty bias_mode