Visible-extended mid-infrared wide spectrum detector based on InAs/GaSb type-Ⅱ superlattices (T2SL)

摘要: Abstract The authors report an innovative design of wide spectrum detector that can detect visible and mid-infrared spectrum, from 0.4 to 5 μm, simultaneously. is designed with microstructure various types photon traps fabricated on InAs/GaSb type-II superlattice materials. Quantum efficiency has been significantly improved due the action which decrease reflectivity surface type-Ⅱ down less than 5%. Under condition 77 K 200 mV bias voltage, responsivity about 0.025–0.45 A/W in wavelength regime 400–790 nm, more 0.3 A/W 800–2000 nm, respectively. Through optimized trap structure, 1.25 A/W predominantly improve quantum up 52.5% at 3 μm.