Extended performance GeSn/Si(100) p-i-n photodetectors for full spectral range telecommunication applications

Mathews, Jay; Roucka, Radek; Junqi Xie; Shui-Qing Yu; Menéndez, José; Kouvetakis, John
September 2009
Applied Physics Letters;9/28/2009, Vol. 95 Issue 13, p133506
Academic Journal
First-generation n-i-GeSn/p-Si(100) photodiode detectors with Ge0.98Sn0.02 active layers were fabricated under complementary metal oxide semiconductor compatible conditions. It is found that, even at this low Sn concentration, the detector quantum efficiencies are higher than those in comparable pure-Ge device designs processed at low temperature. Most significantly, the spectral range of the GeSn device responsivity is dramatically increased—to at least 1750 nm—well beyond the direct band gap of Ge (1550 nm). This allows coverage of all telecommunication bands using entirely group IV materials.


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