title: High bandwidth, high responsivity waveguide-coupled germanium p-i-n photodiode.
abstract: A novel waveguide-coupled germanium p-i-n photodiode is demonstrated which combines high responsivity with very high -3 dB bandwidth at a medium dark current. Bandwidth values are 40 GHz at zero bias and more than 70 GHz at -1 V. Responsivity at 1.55 µm wavelength ranges from 0.84 A/W at zero bias to 1 A/W at -1 V. Room temperature dark current density at -1 V is about 1 A/cm2. The high responsivity mainly results from the use of a new, low-loss contact scheme, which moreover also reduces the negative effect of photo carrier diffusion on bandwidth.
authors.forename: Stefan
authors.initials: S
authors.lastname: Lischke
authors.forename: Dieter
authors.initials: D
authors.lastname: Knoll
authors.forename: Christian
authors.initials: C
authors.lastname: Mai
authors.forename: Lars
authors.initials: L
authors.lastname: Zimmermann
authors.forename: Anna
authors.initials: A
authors.lastname: Peczek
authors.forename: Marcel
authors.initials: M
authors.lastname: Kroh
authors.forename: Andreas
authors.initials: A
authors.lastname: Trusch
authors.forename: Edgar
authors.initials: E
authors.lastname: Krune
authors.forename: Karsten
authors.initials: K
authors.lastname: Voigt
authors.forename: A
authors.initials: A
authors.lastname: Mai