Mid-wavelength infrared unipolar nBp superlattice photodetector

作者：Kazemi Alireza; Myers Stephen; Taghipour Zahra; Mathews Sen; Schuler Sandy Ted; Lee Seunghyun; Cowan Vincent M; Garduno Eli; Steenbergen Elizabeth; Morath Christian; Ariyawansa Gamini; Scheihing John; Krishna Sanjay^*

来源：Infrared Physics & Technology, 2018, 88: 114-118.

DOI：10.1016/j.infrared.2017.11.008

• MWIR detectors
• Type-II strained layer superlattice
• Barrier engineering
• Dark current
• Quantum efficiency

We report a Mid-Wavelength Infrared (MWIR) barrier photodetector based on the InAs/GaSb/AlSb type-II superlattice (T2SL) material system. The nBp design consists of a single unipolar barrier (InAs/AlSb SL) placed between a 4 mu m thick p-doped absorber (InAs/GaSb SL) and an n-type contact layer (InAs/GaSb SL). At 80 K, the device exhibited a 50% cut-off wavelength of 5 mu m, was fully turned-ON at zero bias and the measured QE was 50% (front side illumination with no AR coating) at 4.5 gm with a dark current density of 4.7 x 10(-6) A/cm(2) at V-b = 50 mV. At 150 K and V-b = 50 my, the 50% cut-off wavelength increased to 5.3 mu m, and the QE was 54% at 4.5 mu m with a dark current of 5.0 x 10(-4) A/cm(2).

• 出版日期2018-1