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Avalanche breakdown characteristics are essential for designing avalanche photodiodes. In this letter, we investigated the effects of adding Ga to Al1–xGaxAs0.56Sb0.44 quaternary alloys. Using p-i-n diodes with a 100-nm i—region and alloy composition ranging from $x=0$ to 0.15, we found that the bandgap energy of Al1–xGaxAs0.56Sb0.44 reduces from 1.64 to 1.56 eV. The corresponding avalanche breakdown...
We investigated the temperature dependence of dark current, avalanche gain and breakdown voltage in Al0.85Ga0.15As0.56Sb0.44 (hereafter AlGaAsSb) avalanche photodiodes (APDs) with avalanche region widths, w = 90 and 178 nm. There is negligible band to band tunnelling currents and a very weak temperature dependence of gain observed in both didoes. The temperature coefficient of breakdown voltage, C...
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