High-performance type-II InAs/GaSb superlattice photodiodes

Hooman Mohseni; Yajun Wei; Manijeh Razeghi

doi:10.1117/12.429406

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12 June 2001 High-performance type-II InAs/GaSb superlattice photodiodes

Hooman Mohseni, Yajun Wei, Manijeh Razeghi

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Proceedings Volume 4288, Photodetectors: Materials and Devices VI; (2001) https://doi.org/10.1117/12.429406
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

We report on the demonstration of high performance p-i-n photodiodes based on type-II InAs/GaSb superlattices operating in the very long wavelength infrared (VLWIR) range at 80 K. Material is grown by molecular beam epitaxy on GaSb substrates with excellent crystal quality as evidenced by x- ray diffraction and atomic force microscopy. The processed devices with a 50% cutoff wavelength of (lambda) _c equals 22 micrometers show a peak current responsivity about 5.5 A/W at 80 K. The use of binary layers in the superlattice has significantly enhanced the uniformity and reproducibility of the energy gap. The 90% to 10% cut-off energy width of these devices is on the order of 2 kT which is about four times smaller compared to the devices based on InAs/Ga_1-xIn_xSb superlattices. Similar photovoltaic devices with cut-off wavelengths up to 25 micrometers have been measured at 80 K. Our experimental results shows excellent uniformity over a three inch wafer area, indicating the possibility of VLWIR focal plane arrays based on type-II superlattices.

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Hooman Mohseni, Yajun Wei, and Manijeh Razeghi "High-performance type-II InAs/GaSb superlattice photodiodes", Proc. SPIE 4288, Photodetectors: Materials and Devices VI, (12 June 2001); https://doi.org/10.1117/12.429406

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