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 AlAs_0.09Sb_0.91/GaSb is selected as the DBR mirror. The target wavelength of DBR mirror is 3.3 μm, which is used as methane detector. The supercell is 7 ML InAs/4 ML GaSb, which has a 50% cutoff wavelength of 4 μm. The quantum efficiency (QE) of the detector with DBR mirror can reach ~ 90% at the target wavelength of 3.3 μm, and is significantly higher than that of the device without DBR mirror. The peak detectivity of pBp RCE PD is about ~1 × 10¹³ Jones.

研究了基于单极势垒结构的具有分布式布拉格反射器（DBR）的II型超晶格（T2SL）红外探测器。器件采用传统的二元材料InAs/GaSb，并采用nBn和pBp两种单极势垒结构来降低器件的生成-复合（GR）暗电流。6 周期 AlAs _0.09 Sb _0.91/GaSb 被选为 DBR 镜像。DBR 镜的目标波长为 3.3 μm，用作甲烷检测器。超级电池是 7 ML InAs/4 ML GaSb，其 50% 截止波长为 4 μm。带有 DBR 镜的探测器在 3.3 μm 目标波长处的量子效率 (QE) 可达到~90%，明显高于不带 DBR 镜的装置。pBp RCE PD 的峰值检测率约为 ~1 × 10 ¹³ Jones。