Add time:08/16/2019 Source:sciencedirect.com
We report on fabrication of 320 × 256 dual-band (mid-/long-wave infrared) type-II InAs/GaSb strained layer superlattice (T2LS) focal plane array (FPA) with PBP (cas 103-16-2) architecture. The simplified fabrication procedure has been utilized to reveal the fundamental electro-optical performance of both absorbers in pBp dual-band detector structure. Dark current density of 2.7 × 10−6 A/cm2 (VBias = −0.1 V) and 1.1 × 10−6 A/cm2 (VBias = +0.1 V) was measured for LWIR and MWIR absorbers, respectively (85 μm × 85 μm device). The peak responsivities measured at 77 K were 1.6 A/W (at λ = 5 μm and Vb = +0.4 V) and 1.8 A/W (at λ = 9 μm and Vb = −0.7 V) for MWIR and LWIR absorbers with corresponding values of specific detectivity 5 × 1011 Jones and 2.6 × 1010 Jones, respectively (410 μm × 410 μm device).
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