Evaluation of a 256 × 256 PtSi array for infrared ground-based astronomy

This paper will show that large format PtSi Schottky diode infrared arrays are competitive alternatives to the smaller format photovoltaic arrays for ground-based astronomy. The modest quantum efficiency of the PtSi compared to the photo-voltaic devices is more than compensated for by the larger format. The particular array discussed here is the Hughes 256 X 256 hybrid Schottky array. The use of hybrid technology yields effective fill factors of nearly 100%, which further offset the modest quantum efficiency limitations. The very low dark current, low noise, imaging characteristics, cost, and solid nitrogen operating temperature add to the effectiveness of this array for ground-based imaging. In addition to discussing the characteristics of this array, we will present laboratory test data and astronomical results achieved at Kitt Peak.