TY - GEN
T1 - Development of material quality and structural design for high performance Type II InAs/GaSb superlattice photodiodes and focal plane arrays
AU - Razeghi, Manijeh
AU - Nguyen, Binh Minh
AU - Hoffman, Darin
AU - Delaunay, Pierre Yves
AU - Huang, Edward Kwei Wei
AU - Tidrow, Meimei
AU - Nathan, Vaidya
PY - 2008
Y1 - 2008
N2 - Recent progress made in the structure design, growth and processing of Type-II InAs/GaSb superlattice photo-detectors lifted both the quantum efficiency and the R0A product of the detectors. Type-II superlattice demonstrated its ability to perform imaging in the Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR) ranges, becoming a potential competitor for technologies such as Quantum Well Infrared Photo-detectors (QWIP) and Mercury Cadmium Telluride (MCT). Using an empirical tight-binding model, we developed superlattices designs that were nearly lattice-matched to the GaSb substrates and presented cutoff wavelengths of 5 and 11 μm. We demonstrated high quality material growth with X-ray FWHM below 30 arcsec and an AFM rms roughness of 1.5 Å over an area of 20×20 μm2. The detectors with a 5 μm cutoff, capable of operating at room temperature, showed a R0A of 1.25 106 Ω.cm2 at 77K, and a quantum efficiency of 32%. In the long wavelength infrared, we demonstrated high quantum efficiencies above 50% with high R0A products of 12 Ω.cm 2 by increasing the thickness of the active region. Using the novel M-structure superlattice design, more than one order of magnitude improvement has been observed for electrical performance of the devices. Focal plane arrays in the middle and long infrared range, hybridized to an Indigo read out integrated circuit, exhibited high quality imaging.
AB - Recent progress made in the structure design, growth and processing of Type-II InAs/GaSb superlattice photo-detectors lifted both the quantum efficiency and the R0A product of the detectors. Type-II superlattice demonstrated its ability to perform imaging in the Mid-Wave Infrared (MWIR) and Long-Wave Infrared (LWIR) ranges, becoming a potential competitor for technologies such as Quantum Well Infrared Photo-detectors (QWIP) and Mercury Cadmium Telluride (MCT). Using an empirical tight-binding model, we developed superlattices designs that were nearly lattice-matched to the GaSb substrates and presented cutoff wavelengths of 5 and 11 μm. We demonstrated high quality material growth with X-ray FWHM below 30 arcsec and an AFM rms roughness of 1.5 Å over an area of 20×20 μm2. The detectors with a 5 μm cutoff, capable of operating at room temperature, showed a R0A of 1.25 106 Ω.cm2 at 77K, and a quantum efficiency of 32%. In the long wavelength infrared, we demonstrated high quantum efficiencies above 50% with high R0A products of 12 Ω.cm 2 by increasing the thickness of the active region. Using the novel M-structure superlattice design, more than one order of magnitude improvement has been observed for electrical performance of the devices. Focal plane arrays in the middle and long infrared range, hybridized to an Indigo read out integrated circuit, exhibited high quality imaging.
KW - Focal plane arrays
KW - InAs/GaSb
KW - LWIR
KW - M-structure
KW - MWIR
KW - Photodetectors
KW - Type II superlattice
UR - http://www.scopus.com/inward/record.url?scp=52349116645&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=52349116645&partnerID=8YFLogxK
U2 - 10.1117/12.794218
DO - 10.1117/12.794218
M3 - Conference contribution
AN - SCOPUS:52349116645
SN - 9780819473028
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Infrared Spaceborne Remote Sensing and Instrumentation XVI
T2 - Infrared Spaceborne Remote Sensing and Instrumentation XVI
Y2 - 11 August 2008 through 13 August 2008
ER -