Ultra-fast photodetectors based on high-mobility indium gallium antimonide nanowires

摘要

Because of tunable bandgap and high carrier mobility, ternary III-V nanowires (NWs) have demonstrated enormous potential for advanced applications. However, the synthesis of large-scale and highly-crystalline InxGa1?xSb NWs is still a challenge. Here, we achieve high-density and crystalline stoichiometric InxGa1?xSb (0.09 -orientation via chemical vapor deposition. The as-prepared NWs show excellent electrical and optoelectronic characteristics, including the high hole mobility (i.e. 463?cm2?V?1?s?1 for In0.09Ga0.91Sb NWs) as well as broadband and ultrafast photoresponse over the visible and infrared optical communication region (1550?nm). Specifically, the In0.28Ga0.72Sb NW device yields efficient rise and decay times down to 38 and 53?μs, respectively, along with the responsivity of 6000?A?W?1 and external quantum efficiency of 4.8?×?106 % towards 1550?nm regime. High-performance NW parallel-arrayed devices can also be fabricated to illustrate their large-scale device integrability for next-generation, ultrafast, high-responsivity and broadband photodetectors.