Computer Science
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4454..212g&link_type=abstract
Proc. SPIE Vol. 4454, p. 212-217, Materials for Infrared Detectors, Randolph E. Longshore; Ed.
Computer Science
1
Scientific paper
We model the effects of the electronic band structure on hole- and electron-initiated impact ionization coefficients. Calculations for bulk alloy AlGaSb avalanche photodiodes with alloy compositions near the resonance between the energy gap and the spin-orbit splitting reveal that the hole- to electron-impact ionization coefficient ratio shows no enhancement at high electric fields. This is due to carrier heating spreading the hole distribution in the split-off band. However, an enhancement due to the resonance in the band structure is predicted for weak fields. A strategy to extend this type of an enhancement to high fields in a superlattice involves band engineering the superlattice to place flat bands approximately one energy gap below the top of the valence band. This prevents hot holes from spreading in energy and hence gives rise to strong hole-initiated impact ionization and a large hole- to electron-impact ionization coefficient ratio. Quantitative results are presented for a mid-infrared InAs/GaInSb/AlSb superlattice.
Ehrenreich Henry
Flatte' Michael E.
Grein Christoph H.
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