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Planar germanium photodiodes

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Abstract

Planar passivated germanium photodiodes have been developed whose useful response at 22°C extends from 0.6 μm to 1.85 μm at a nominal operating voltage of 20 V. Typical characteristics at 22°C are diode capacitance, 100 pF/cm2; rise and fall times, 10 nsec; leakage current, 2.5 mA/cm2; D*(1.54 μm) ∼2.5 × 1010 cm/W/√Hz with a 3-dB frequency of ∼45 MHz. Single and multiple element detectors ranging in size from 2 × 0.25-mm2 elements with 50-μm spacing between elements to 3-cm2 quadrant detectors have been made successfully for operation at temperatures from 77 K to room temperature.

© 1975 Optical Society of America

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