Infrared ground-based astronomy with the Hughes 256 X 256 PtSi array

Astronomy and Astrophysics – Astronomy

Scientific paper

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Imaging Techniques, Infrared Astronomy, Infrared Radiation, Photovoltaic Cells, Quantum Efficiency, Schottky Diodes, Solar Arrays, Alternatives, Costs, Low Currents, Noise Measurement, Operating Temperature, Platinum, Silicon, Solid Nitrogen

Scientific paper

It is shown that large format PtSi Schottky diode infrared arrays, the Hughes 256 X 256 hybrid Schottky array in particular, are competitive alternatives to the smaller format 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 use of hybrid technology yields effective fill factors of nearly 100 percent, and the low dark current, noise, excellent 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, researchers present laboratory test data and astronomical results achieved at Kitt Peak.

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