Type-II superlattice HD detectors at IRnova for eSWIR and MWIR applications

Abstract

In this paper, the first extended SWIR (eSWIR, 1-2.5 µm) focal plane array (FPA) results, based on IRnova's 2.5 µm cutoff T2SL design are presented. High sensitivity is demonstrated with a signal to noise ratio (SNR) of 215 @ 50% well fill and a dynamic range of 1750 for a full well size of 118 ke-of the CTIA ROIC. Good uniformity across the detectors is evidenced by narrow SNR histograms, uniform response maps and low signal non-uniformity (~1 %). This work is part of the development route towards large footprint (2048 × 512 pixels, 15 µm pitch) HD space prototype eSWIR FPAs, currently performed within the EU-project STEP (Silicon and T2SL EuroPean collaboration for a non-dependent supply chain for large eSWIR FPAs). In addition, a first preview of the HD FPA performance enabled by IRnova's midwave infrared (MWIR) T2SL small pitch technology is presented, showing an NETD of 32 mK at 120 K with F/3, 60 Hz and 10 ms integration time.