Short wavelength HgCdTe staring focal plane for low background astronomy applications

Details Short wavelength HgCdTe staring focal plane for low background astronomy applications Short wavelength HgCdTe staring focal plane for low background astronomy applications

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989tidt.work..295h&link_type=abstract

In NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop p 295-310 (SEE N90-21313 14-35)

Astronomy and Astrophysics

Astronomy

Circuits, Focal Plane Devices, Infrared Astronomy, Infrared Radiation, Mercury Cadmium Tellurides, Multiplexing, Photovoltaic Effect, Preamplifiers, Quantum Efficiency, Radiation Detectors, Electrons, Linearity, Luminescence, Readout, Silicon

Scientific paper

The design of a 128x128 staring short wave infrared (SWIR) HgCdTe focal plane incorporating charge integrating transimpedance input preamplifiers is presented. The preamplifiers improve device linearity and uniformity, and provide signal gain ahead of the miltiplexer and readout circuitry. Detector's with cutoff wavelength of 2.5 microns and operated at 80 K have demonstrated impedances in excess of 1016 ohms with 60 percent quantum efficiency. Focal plane performance using a smaller format device is presented which demonstrates the potential of this approach. Although the design is capable of achieving less than 30 rms electrons with todays technology, initial small format devices demonstrated a read noise of 100 rms electrons and were limited by the atypical high noise performance of the silicon process run. Luminescence from the active silicon circuitry in the multiplexer limits the minimum detector current to a few hundred electrons per second. Approaches to eliminate this excessive source of current is presented which should allow the focal plane to achieve detector background limited performance.

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