Author(s): Du, YN (Du, Yanan); Wang, L (Wang, Lei); Xu, Y (Xu, Yun); Song, GF (Song, Guofeng)

Source: PHYSICA B-CONDENSED MATTER Volume: 619 Article Number: 413201 DOI: 10.1016/j.physb.2021.413201 Published: OCT 15 2021

Abstract: The type-II superlattice (T2SLs) infrared detector with distributed Bragg reflector (DBR) on the basis of unipolar barrier structure is investigated. The traditional binary material InAs/GaSb is used in the device, and two kinds of unipolar barrier structures, nBn and pBp, are used to reduce the generation-recombination (GR) dark current of the device. 6 periods of AlAs0.09Sb0.91/GaSb is selected as the DBR mirror. The target wavelength of DBR mirror is 3.3 mu m, which is used as methane detector. The supercell is 7 ML InAs/4 ML GaSb, which has a 50% cutoff wavelength of 4 mu m. The quantum efficiency (QE) of the detector with DBR mirror can reach similar to 90% at the target wavelength of 3.3 mu m, and is significantly higher than that of the device without DBR mirror. The peak detectivity of pBp RCE PD is about similar to 1 x 10(13) Jones.

Accession Number: WOS:000713715700004

ISSN: 0921-4526

eISSN: 1873-2135

Full Text: https://www.sciencedirect.com/science/article/pii/S0921452621003835?via%3Dihub