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A high-performance self-powered UV photodetector based on SnO2 mesoporous spheres @ TiO2

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Abstract

A novel self-powered UV photodetector (UVPD) based on the photoelectrochemical cell (PECC) has been constructed using the TiO2 coated SnO2 mesoporous spheres (SnO2-MS@TiO2). This self-powered UVPD displays a higher photocurrent density compared to the UVPD with the pure SnO2-MS. By means of external quantum efficiency (EQE), UV-vis absorption, and electrochemical impedance measurements, we scrutinize the intrinsic role of the TiO2 coating layer on the photocurrent enhancement. Under UV irradiation, this UVPD exhibits a high on/off ratio of 11519, a fast rise time of 0.007 s and decay time of 0.006 s, together with the excellent visible-blind characteristic and linear optical signal response. The self-powered photodetector is a promising candidate for application in high-sensitivity and high-speed UVPDs.

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Correspondence to Qingjiang Yu, Jinzhong Wang or Cuiling Yu.

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Huang, Y., Yu, Q., Wang, J. et al. A high-performance self-powered UV photodetector based on SnO2 mesoporous spheres @ TiO2 . Electron. Mater. Lett. 11, 1059–1065 (2015). https://doi.org/10.1007/s13391-015-5111-0

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  • DOI: https://doi.org/10.1007/s13391-015-5111-0

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