This paper will show that large format PtSi Schottky diode infrared arrays are competitive alternatives to the smaller formát photovoltaic arrays for ground -based astronomy. The modest quantum efficiency of the PtSi compared to the photovoltaic 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.
The NASA Jupiter Europa Orbiter (JEO) conceptual payload contains a thermal instrument with six different spectral bands ranging from 8µm to 100μm. The thermal instrument is based on multiple linear arrays of thermopile detectors that are intrinsically radiation hard; however, the thermopile CMOS readout needs to be hardened to tolerate the radiation sources of the JEO mission. Black Forest Engineering is developing a thermopile readout to tolerate the JEO mission radiation sources. The thermal instrument and ROIC process/design techniques are described to meet the JEO mission requirements.
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