Black Phosphorus Mid-Infrared Photodetectors with High Gain

Recently, black phosphorus (BP) has joined the two-dimensional material family as a promising candidate for photonic applications due to its moderate bandgap, high carrier mobility, and compatibility with a diverse range of substrates. Photodetectors are probably the most explored BP photonic devices, however, their unique potential compared with other layered materials in the mid-infrared wavelength range has not been revealed. Here, we demonstrate BP mid-infrared detectors at 3.39 μm with high internal gain, resulting in an external responsivity of 82 A/W. Noise measurements show that such BP photodetectors are capable of sensing mid-infrared light in the picowatt range. Moreover, the high photoresponse…

• NS
  National Science Foundation

  Award: EFMA-1542815
• AS
  Austrian Science Fund

  Award: 539-N16
• SF
  Seventh Framework Programme

  Award: 604391
• AF
  Air Force Office of Scientific Research

  Award: FA9550-14-1-0277