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8 April 1998 High-performance GaAs homojunction far-infrared detectors
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A high performance, bias tunable, p-GaAs homojunction interfacial workfunction internal photoemission far-IR detector has been demonstrated. A responsivity of 3.10 +/- 0.05 A/W, a quantum efficiency of 12.5 percent and a detectivity D* of 5.9 X 1010 cm (root) Hz/W, were obtained at 4.2K, for cutoff wavelengths from 80 to 100 micrometers . The bias dependences of quantum efficiency, detectivity, and cutoff wavelength have been measured and are well explained by the theoretical models, where the cutoff wavelength is modeled by a modified high density theory, and the quantum efficiency is predicted by scaling the free carrier absorption coefficient linearly with the doping concentration. The effect of the number of layers on detector performance and the uniformity of the detectors have been discussed. A comparison with Ge:Ga photoconductive detectors suggest that a similar or even better performance may be obtainable.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. G. Unil Perera, W. Z. Shen, Hui Chun Liu, Margaret Buchanan, and William J. Schaff "High-performance GaAs homojunction far-infrared detectors", Proc. SPIE 3287, Photodetectors: Materials and Devices III, (8 April 1998);

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