Computer Science – Performance
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3629..129h&link_type=abstract
Proc. SPIE Vol. 3629, p. 129-136, Photodetectors: Materials and Devices IV, Gail J. Brown; Manijeh Razeghi; Eds.
Computer Science
Performance
Scientific paper
A 15-period GaAs/Al(subscript 0.3)Ga(subscript 0.7)As superlattice infrared photodetector (SLIP) is presented. A 1500 Angstrom wide Al(subscript 0.22)Ga(subscript 0.78)As blocking barrier is introduced to reduce the dark current. The measured noise power spectral density of dark current at 77 K shows characteristics of i(subscript n)(superscript 2) equals 2qI(subscript d) rather than the generation-recombination noise. The spectral response is between 8 - 10 micrometer with (lambda) (subscript p) equals 9.3 micrometer. Background limited performance can be achieved up to 65 K. Assuming the noise of background photocurrent to be 2qI(subscript pc), we estimate D*(subscript BLIP) equals 1.5 X 10(superscript 10) cm(root)Hz/W. At 77 K, the detectivity is D* equals 3.5 X 10(superscript 9)cm(root)Hz/W with the bias voltage of 0.1 V. In comparison with conventional QWIPS, our SLIP has the advantage of higher performance at low bias voltage and lower power consumption.
Hsu Mao-Chieh
Hsu Ya-Fen
Kuan C. H.
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