Solution-processed organic/inorganic hybrid photodetector with selective deep UV sensitivity

• Devices with structure of ITO/PEDOT:PSS/TmPyPB/Py-NaTaO3/Al were fabricated.
• Device presented selective sensitivity to wavelength shorter than 317 nm UV light.
• The device showed ultraviolet signal-to-noise ratio of about 3 orders of magnitude.

Wide bandgap NaTaO3 nanocrystals (NaTaO3 NCs) were synthesized by a two-step hydrothermal method. The hybrid film based on the pyridine modified NaTaO3 NCs and 1, 3, 5-tri(m-pyrid-3-yl-phenyl) benzene (TmPyPB) was prepared by solution processing at room temperature. Photodetector based on the hybrid film presented selective sensitivity to UV signals with wavelength shorter than 317 nm because the bandgap wider than 4.0 eV. Under 5 mW/cm2 280 nm illumination through the semi-transparent Al cathode, a high ultraviolet signal-to-noise ratio of 3 orders of magnitude with response time about 200–300 ms can be achieved for the device in the case of −3 V bias.

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