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We demonstrate, for the first time, the application of dopant-segregation (DS) technique in metal-germanium- metal photodetectors for dark-current suppression and high-speed performance. Low defect density and surface smooth epi-Ge (~300 nm) layer was selectively grown on patterned Si substrate using two-step epi-growth at 400degC/600degC combined with a thin (~10 nm) low-temperature Si/Si0.8 Ge0.2...
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