MIOMD-XI Speakers    
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1.  Dr. David Ting, Jet Propulsion Lab, USA
Invited Talk: Mid- and Long-Wavelength Barrier Infrared Detectors
Speaker Biography: David Z. Ting received his B.S. degree with honors in physics from the California Institute of Technology, Pasadena, in 1980, and M.S. and Ph.D. degrees in physics from the University of Illinois at Urbana-Champaign in 1981 and 1986, respectively. He is currently the Deputy Director of the Center for Infrared Sensors and a Principal Member of Engineering Staff at the NASA Jet Propulsion Laboratory. His research interests include semiconductor physics and devices. Results of his work have been reported in over 180 research publications and in over 120 conference presentations and technical seminars. He holds 6 patents.

Summary: The effective use of unipolar barriers in heterostructure III-V mid-wavelength infrared (MWIR) and longwavelength infrared (LWIR) detectors have resulted in substantial reduction in generation-recombination dark currents and enhanced detector performance. One example is the InAs/GaSb type-II superlattice based complementary barrier infrared detector (CBIRD), which has already demonstrated very good performance in LWIR detection. In this work we describe a modified CBIRD device that incorporates a double tunnel junction contact designed to enable more robust device and focal plane array processing. By fine-tuning the device structure, we also reduced CBIRD turn-on bias from 200 mV to zero. Another example of the effective use of unipolar barrier is the MWIR nBn detector. The standard nBn detector is based on the InAsSb absorber lattice-matched to the GaSb substrate. We show that by incorporating self-assembled InSb quantum dots into the active detection area, we can extend the detector cutoff wavelength from ~4.2 μm to ~6 μm, allowing the coverage of the full MWIR transmission window. The quantum dot barrier infrared detector (QD-BIRD) show infrared response at up to 225 K.
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