Characteristics of a superlattice infrared detector and comparison with QWIP

Mao-Chieh Hsu; Y.F. Hsu; Kuan H. Chen

doi:10.1117/12.344550

7 April 1999 Characteristics of a superlattice infrared detector and comparison with QWIP

Mao-Chieh Hsu, Y.F. Hsu, Kuan H. Chen

Proceedings Volume 3629, Photodetectors: Materials and Devices IV; (1999) https://doi.org/10.1117/12.344550
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

A 15-period GaAs/Al_0.3Ga_0.7As superlattice infrared photodetector (SLIP) is presented. A 1500 Angstrom wide Al_0.22Ga_0.78As 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_n² equals 2qI_d rather than the generation-recombination noise. The spectral response is between 8 - 10 micrometer with (lambda) _p equals 9.3 micrometer. Background limited performance can be achieved up to 65 K. Assuming the noise of background photocurrent to be 2qI_pc, we estimate D*_BLIP equals 1.5 X 10¹⁰ cm(root)Hz/W. At 77 K, the detectivity is D* equals 3.5 X 10⁹cm(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.

Citation Download Citation

Mao-Chieh Hsu, Y.F. Hsu, and Kuan H. Chen "Characteristics of a superlattice infrared detector and comparison with QWIP", Proc. SPIE 3629, Photodetectors: Materials and Devices IV, (7 April 1999); https://doi.org/10.1117/12.344550

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