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Infrared charge-injection-device array performance at low background.

C R McCreight, J H Goebel

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    |March 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Low-background tests show that silicon bismuth (Si:Bi) charge-injection-device (CID) infrared detector arrays are highly sensitive for space astronomy. These arrays offer performance comparable to discrete photoconductors, indicating strong potential for astronomical applications.

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    Area of Science:

    • Astronomy and Astrophysics
    • Infrared Detector Technology
    • Semiconductor Physics

    Background:

    • Space-based astronomical observations require highly sensitive infrared (IR) detectors.
    • Charge-Injection-Device (CID) arrays offer potential advantages over traditional discrete detectors.
    • Silicon:Bismuth (Si:Bi) is a material investigated for its IR detection properties.

    Purpose of the Study:

    • To evaluate the feasibility of a 1x32 Si:Bi CID IR detector array for space-based astronomical observations.
    • To characterize the performance of the Si:Bi CID array under low-background conditions.
    • To compare the sensitivity of Si:Bi CID arrays with existing technologies.

    Main Methods:

    • Low-background testing of a 1x32 Si:Bi CID IR detector array.
    • Optimization of detector performance by controlling temperature.
    • Measurement of key performance metrics including responsivity, noise level, and noise equivalent power.

    Main Results:

    • Optimal performance was achieved at 11 K.
    • The Si:Bi CID array exhibited a peak responsivity of 4.4 A/W.
    • An average noise level of ~670 electrons and a minimum noise equivalent power of 3 x 10(-17) W/[equation] were recorded for a 1-second integration time.

    Conclusions:

    • The measured sensitivity of the Si:Bi CID array is comparable to discrete extrinsic silicon photoconductors.
    • The absence of anomalous effects suggests reliability for astronomical use.
    • Extrinsic silicon CID arrays show significant promise for future astronomical applications.