Details

Autor(en) / Beteiligte

• Schuler-Sandy, T.
• Myers, S.
• Klein, B.
• Gautam, N.
• Ahirwar, P.
• Tian, Z.-B.
• Rotter, T.
• Balakrishnan, G.
• Plis, E.
• Krishna, S.

Titel

Gallium free type II InAs/InAsxSb1-x superlattice photodetectors

Ist Teil von

• Applied physics letters, 2012-08, Vol.101 (7), p.71111

Erscheinungsjahr

2012

Link zum Volltext

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• We report on a mid-wave infrared ( lambda 50% cut-off similar to 5.4 mu m at 77 K) Ga-free Type II InAs/InAsxSb1-x (x = 0.65) superlattice detector Radiometric measurements reveal a quantum efficiency of 20% ( lambda = 4 mu m, 77 K) with a dark current density of 2.1 10-4 A/cm2 (-10 mV) with spectral response observable up to 210 K. Although the Shockley-Read-Hall lifetime is expected to be longer for Ga-free superlattices, the dark current density is larger than that of conventional InAs/GaSb superlattice detectors. This is attributed to increased probability of carrier tunneling due to reduced valence and conduction band-offsets in InAs/InAsSb SL system.