Low-frequency noise behavior at Reverse Bias Region in InAs/GaSb Superlattice Photodiodes on Mid-Wave Infrared

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Tansel T., Kutluer K., Muti A., Salihoglu O., Aydinli A., TURAN R.

Conference on Infrared Technology and Applications XXXIX, Maryland, Amerika Birleşik Devletleri, 29 Nisan - 03 Mayıs 2013, cilt.8704 identifier identifier

  • Cilt numarası: 8704
  • Doi Numarası: 10.1117/12.2016388
  • Basıldığı Şehir: Maryland
  • Basıldığı Ülke: Amerika Birleşik Devletleri


We describe a relationship between the noise characterization and activation energy of InAs/GaSb superlattice Mid-Wavelength-Infrared photodiodes for different passivation materials applied to the device. The noise measurements exhibited a frequency dependent plateau (i.e. 1/f-noise characteristic) for unpassivated as well as Si3N4 passivated samples whereas 1/f-type low noise suppression (i.e. frequency independent plateau) with a noise current reduction of more than one order of magnitude was observed for SiO2 passivation. For reverse bias values below -0.15V, the classical Schottky-noise calculation alone did not appear to describe the noise mechanism in a SL noise behavior, which shows a divergence between theoretically and experimentally determined noise values. We identify that, the additional noise appears, with and without passivation, at the surface activation energy of < 60 meV and is inversely proportional to the reverse bias. This is believed to be caused by the surface dangling-bonds (as well as surface states) whose response is controlled by the applied reverse bias. The calculated noise characteristics showed a good agreement with the experimental data.