3.3 - Type-II Superlattice Radiation Thermometer
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings IRS² 2015
- I3 - IR Components and Systems
- M. Hobbs, J. Willmott, P. Droegmoeller - Land Instruments International, Dronfield (UK), J. David, C. Tan - The University of Sheffield (UK)
- 929 - 933
We report an evaluation of an InGaAs/GaAsSb type-II superlattice (T2SL) as a potential short-wave infrared (SWIR) detector for radiation thermometry. The multiple quantum well structure of the T2SL, as well as being lattice-matched to InP substrates, offers potentially low dark current compared with the current commercially available alternatives. The T2SL structure also offers tunability in the detection wavelength, therefore making it a versatile detector material. A T2SL structure was grown on an InP substrate using molecular beam epitaxy. It was fabricated and analyzed, with electrical and optical characterization taking place before the T2SL detector was evaluated for radiation thermometry. Temperature dependent radiation thermometry measurements were performed between blackbody furnace temperatures of 250 and 630 °C. The T2SL-thermometer showed good linearity over the temperature range measured with an effective wavelength of 2.56 μm. Analysis of the results suggests areas of improvement required in both the dark current and responsivity of the T2SL. With further development work on the T2SL material, it should be possible to optimize a T2SL detector for radiation thermometry capable of measuring down to room temperature.