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Germanium was successfully hyperdoped with sulfur by means of nanosecond pulse laser and SF6 gas. A photodiode was fabricated based on sulfur-hyperdoped germanium. Rectifying current-voltage characteristics were observed for the device. The sulfur-hyperdoped germanium photodiode showed an internal quantum efficiency close to 150 $\%$ from visible to near infrared and increased to 275$\%$ for the ultraviolet...
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