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We describe a combined 6 × 6 k · p and one-band effective mass modelling tool to calculate absorption spectra in Ge-SiGe multiple quantum well (MQW) heterostructures. We find good agreement with experimentally measured absorption spectra of Ge-SiGe MQW structures described previously in the literature, proving its predictive capability, and the simulation tool is used for the analysis and design of...
We report the first demonstration of a waveguide-integrated avalanche photodetector using Group-IV heterostructure materials. Such device achieved a responsivity of ~0.8 A/W at unity gain and an impressive gain-bandwidth product of ~105 GHz at 1550 nm photon wavelength.
Monolithic germanium photodetectors integrated on Si with external efficiency up to 68% at 1550 nm and low dark current density 3.2 mA/cm2 are demonstrated. The absorption edge red shifted by 47 nm corresponding to bandgap energy reduced by 24 meV.
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