Abstract
Potassium niobate KNbO3 powder was synthesized via a solid-state reaction method. X-ray diffraction analysis confirmed that the compound is orthorhombic structure with space group Cm2 m. The cuboid-shape morphology with average grain size about 100–300 nm was observed by scanning electron microscope. A strong absorption from the onset at 350 nm was observed, and the energy bandgap is estimated to be 3.23 eV. KNbO3 also exhibits an obvious photovoltaic response from 320 to 380 nm with a peak at 352 nm, which is due to the electronic transfer from O 2p to Nb 4d. It was suggested that the build-in electric field mainly contribute to the photovoltaic response for orthorhombic KNbO3.
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