GaN/AlN quantum disc single‐nanowire photodetectors

We demonstrate single-nanowire photodetectors based on nanowires containing GaN/AlN quantum disc heterostructures. The structural and electronic properties are investigated by photocurrent and microphotoluminescence spectroscopy, as well as scanning transmission electron microscopy. Single-nanowire photodetectors are visible-blind with photoresponse in the ultraviolet spectral range arising from interband absorption in the multi-quantum disc GaN/AlN heterostructure. The photoconductive gain as high as 10 4 is measured.