In the short wavelength infrared (SWIR) region, InGaAs/GaAsSb type-II quantum well absorption structures are proposed as an attractive material for realizing low dark current. Recently QVGA format (array size 320×256) focal plane array (FPA) with cutoff-wavelength of 2.35 μm was demonstrated for commercial use by our group. We succeeded in extending cut-off wavelength of FPA consisting of InGaAs/GaAsSb type-II quantum well up to 2.5 μm. The 250-pairs InGaAs/GaAsSb quantum well structure lattice matched to InP substrate was grown by metal organic vapor phase epitaxy (MOVPE). The p-n junction of each pixel was formed by selective zinc diffusion method. Dark current of pixel showed the diffusion current limited mode and slightly better than that of HgCdTe with a same cutoff-wavelength. We present the electrical and optical characteristics of InGaAs/GaAsSb type-II quantum well FPA with cutoff-wavelength of 2.5 μm.
T. Kawahara, K. Machinaga, B. Sundararajan, K. Miura, M. Migita, H. Obi, T. Fuyuki, K. Fujii, T. Ishizuka, H. Inada, and Y. Iguchi, "InGaAs/GaAsSb type-II quantum-well focal plane array with cutoff-wavelength of 2.5 μm," Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 1011115 (Presented at SPIE OPTO: January 31, 2017; Published: 27 January 2017); https://doi.org/10.1117/12.2254566.
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