Large-area SnTe nanofilm: preparation and its broadband photodetector with ultra-low dark current

  • Song L
  • Tang L
  • Hao Q
  • et al.
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Abstract

Photodetectors are receiving increasing attention because of their widely important applications. Therefore, developing broadband high-performance photodetectors using new materials that can function at room temperature has become increasingly important. As a functional material, tin telluride (SnTe), has been widely studied as a thermoelectric material. Furthermore, because of its narrow bandgap, it can be used as a novel infrared photodetector material. In this study, a large-area SnTe nanofilm with controllable thickness was deposited onto a quartz substrate using magnetron sputtering and was used to fabricate a photodetector. The device exhibited a photoelectric response over a broad spectral range of 400-1050 nm. In the near-infrared band of 940 nm, the detectivity ( D *) and responsivity ( R ) of the photodetector were 3.46×10 11 cmHz 1/2 w -1 and 1.71 A/W, respectively, at an optical power density of 0.2 mWcm -2 . As the thickness of the SnTe nanofilm increased, a transition from semiconducting to metallic properties was experimentally observed for the first time. The large-area (2.5cm × 2.5cm) high-performance nanofilms show important potential for application in infrared focal plane array (FPA) detectors.

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Song, L., Tang, L., Hao, Q., Yang, C., Teng, K. S., Wang, H., … Wei, H. (2022). Large-area SnTe nanofilm: preparation and its broadband photodetector with ultra-low dark current. Optics Express, 30(9), 14828. https://doi.org/10.1364/oe.454587

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