Enhanced photo-collection in single BiFeO3 nanowire due to carrier separation from radial surface field

Surface State‐Induced Anomalous Negative Thermal Quenching of Multiferroic BiFeO3 Nanowires

“…These oxygen vacancies exist in three charged states: singly charged (V O+ ), doubly charged (V O++ ), and neutral (V O ). It should be noted that the emission wavelength closely matches with our previously reported results . However, the variation in relative intensity and slight shift of the defect emission is probably due to sample‐to‐sample variations in the depth of defect states (energy of defect sites) due to small size and shape variation of BFO nanostructures.…”

“…The fact that which of these defects are dominant depends on the method of material synthesis. Since our synthesis is based on Bi rich conditions oxygen vacancies are the most favorable defects to form as also reported in our previous work . This conclusion has been already confirmed by XPS measurement in which the Fe 2p and O 1s spectra showed the presence of oxygen vacancies (please refer to Figure S2, Supporting Information).…”

“…Since our synthesis is based on Bi rich conditions oxygen vacancies are the most favorable defects to form as also reported in our previous work. [8,10] This conclusion has been already confirmed by XPS measurement in which the Fe 2p and O 1s spectra showed the presence of oxygen vacancies (please refer to Figure S2, Supporting Information). These oxygen vacancies exist in three charged states: singly charged (V Oþ ), doubly charged (V Oþþ ), and neutral (V O ).…”

“…Multiferroic wide‐bandgap semiconductors, such as BiFeO 3 (BFO) have attracted intense research interests due to their broad range of potential applications in optoelectronic devices such as ferroelectric diodes, photovoltaic cells, photodetectors and photothermal sensing . In one dimensional (1‐D) BFO nanostructures, because of their high surface‐to‐volume ratio, surface states play a crucial role in their optical and electrical properties . The surface states may serve as traps for carriers and hence affect the recombination and transport of charge carriers .…”

“…[7] In one dimensional (1-D) BFO nanostructures, because of their high surface-to-volume ratio, surface states play a crucial role in their optical and electrical properties. [7][8][9][10] The surface states may serve as traps for carriers and hence affect the recombination and transport of charge carriers. [11][12][13] At the nanoscale, surface defect states are more dominant and are very sensitive to external stimuli such as photons, electric fields and temperature.…”