title: High-performance visible blind ultraviolet photodetector based on KTaO3single crystal.
abstract: We report a visible-blind ultraviolet photoconductive detector with interdigitated electrodes based on KTaO3(KTO) single crystals. Both the steady spectral responses and the transient photovoltaic measurements clearly exhibit a cutoff wavelength at 344 nm (∼3.6  eV), in accordance with the bandgap of KTO. The KTO photodetectors show a low dark current ∼1.5  pA at 20 V, and a high UV-to-visible rejection ratio with 3 orders of magnitude at room temperature. The quantum efficiency is 37.49% under 20 V bias, and the detectivity D*of 3.85×1012cm·Hz0.5/W, which is comparable to that of silicon photodetectors in the UV region. The rise time of photoelectric response is ∼260  ps, indicating an ultrafast photoelectric response characteristic. The present work offers appealing prospects for the application of KTO materials in high-performance visible blind ultraviolet photodetectors.
authors.forename: Jing-Ting
authors.initials: JT
authors.lastname: Yang
authors.forename: Chen
authors.initials: C
authors.lastname: Ge
authors.forename: Kui-Juan
authors.initials: KJ
authors.lastname: Jin
authors.forename: Hui-Bin
authors.initials: HB
authors.lastname: Lu
authors.forename: Guo-Zhen
authors.initials: GZ
authors.lastname: Yang