GaInAs/GaAsSb type-II multiple quantum wells (MQWs) grown on InP substrates by molecular beam epitaxy (MBE)
were investigated for potential use in p-i-n photodiodes operating in the mid-infrared spectral region. In these quantum
well structures, electrons and holes are spatially separated. The resulting spatially indirect type-II detection occurs at
longer wavelength than the spatially direct intraband recombination in either GaInAs or GaAsSb. A 4-band k · p
Hamiltonian model was employed to calculate the detection wavelengths and wavefunction overlaps. A p-i-n structure
with 100 pairs of Ga0.66In034As (~7.0 nm)/GaAs0.25Sb0.75 (~5.0 nm) MQWs structure with operation wavelength of above
3.0 μm was designed and grown by MBE. The compressively strained GaAsSb layers are strain-compensated by tensile
strained GaInAs. Photo response of above 3 μm was observed by room temperature responsivity measurements.
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