title: GeSn/Ge multiquantum well photodetectors on Si substrates.
abstract: Vertical incidence GeSn/Ge multiquantum well (MQW) pin photodetectors on Si substrates were fabricated with a Sn concentration of 7%. The epitaxial structure was grown with a special low temperature molecular beam epitaxy process. The Ge barrier in the GeSn/Ge MQW was kept constant at 10 nm. The well width was varied between 6 and 12 nm. The GeSn/Ge MQW structures were grown pseudomorphically with the in-plane lattice constant of the Ge virtual substrate. The absorption edge shifts to longer wavelengths with thicker QWs in agreement with expectations from smaller quantization energies for the thicker QWs.
authors.forename: M
authors.initials: M
authors.lastname: Oehme
authors.forename: D
authors.initials: D
authors.lastname: Widmann
authors.forename: K
authors.initials: K
authors.lastname: Kostecki
authors.forename: P
authors.initials: P
authors.lastname: Zaumseil
authors.forename: B
authors.initials: B
authors.lastname: Schwartz
authors.forename: M
authors.initials: M
authors.lastname: Gollhofer
authors.forename: R
authors.initials: R
authors.lastname: Koerner
authors.forename: S
authors.initials: S
authors.lastname: Bechler
authors.forename: M
authors.initials: M
authors.lastname: Kittler
authors.forename: E
authors.initials: E
authors.lastname: Kasper
authors.forename: J
authors.initials: J
authors.lastname: Schulze