We have fabricated 0.5*0.5*0.5-mm3 Ge:Ga photoconductors for the (OI) 63- mu m line channel of the Far-Infrared Line Mapper (FILM) on the Infrared Telescope in Space (IRTS). These photoconductors have a high responsivity of 10-20 A/W ( eta G Of 0.13-0.25) and a good noise equivalent power (NEP) of about 2*10-17 W/ square root (Hz) for step change in photon influx at a bias field of 1.8 V/cm and operational temperature of 2 K under a low background photon influx of 1.1 to 2.2*106 photons/s. The photoconductors show slow transient response with a time constant of about 10 s at low temperature under low background conditions, but they have almost no hook response. The responsivity to chopped light decreases as the chopping frequency increases from 7.5 to 210 Hz. We infer that this is due to what we call the "moderately fast response". Two time constants, tau a nearly equal 10 s and tau m nearly equal 0.23 s, derived from the two-region model of a Ge:Ga photoconductor, correspond to the slow transient response and the "moderately fast response", respectively.


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    Title :

    Ge:Ga far-infrared photoconductors for space applications


    Additional title:

    Ge:Ga-Ferninfrarot-Photoleiter für Raumfahrt-Anwendungen


    Contributors:
    Hiromoto, N. (author) / Fujiwara, M. (author) / Shibai, K. (author) / Okuda, H. (author)

    Published in:

    Publication date :

    1996


    Size :

    5 Seiten, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Moderate-fast transient response of the Ge:Ga photoconductors

    Fujiwara, M. / Hiromoto, N. / Araki, K. | Tema Archive | 1995


    Performances Of Arrays Of Ge:Ga Far-Infrared Detectors

    Mccreight, C. / Farhoomand, J. | NTRS | 1992


    Far-Infrared Stressed Ge:Ga Array for FIRST

    Wolf, J. / Katterloher, R. / Lemke, D. et al. | British Library Online Contents | 1996


    Convections and crystal growth of Ge:Ga

    Hildmann, B. O. / Moeller, U. / Baehr, G. | British Library Online Contents | 1994


    Untersuchungen zum Bridgman-Verfahren am System Ge:Ga

    Möller, Uwe / Abteilung Korrosion und Kristallzucht, Institut für Werkstoff-Forschung, Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), Köln | TIBKAT | 1991