title: Thermally Induced Tensile Strain of Epitaxial Ge Layers Grown by a Two-Step e-Beam Evaporation Process on Si Substrates.
abstract: We have investigated the thermally induced tensile strain in Ge-on-Si for use in optical sources of interconnection systems. Epitaxial Ge layers were grown using a two-step hetero-epitaxy at low and high temperatures. The as-grown Ge-on-Si was then annealed for direct bandgap conversion. A tensile strain of 0.06% in the as-grown Ge increased to 0.31% after annealing at 850 degrees C. As the thermal budget of this post-growth anneal was increased, the tensile strain of relaxed Ge-on-Si also increases and a Si-Ge alloy forms. Physical characterization indicates a tunable tensile stain in Ge-on-Si can be realized using post-growth annealing, which will allow for a wide range of frequencies in optical interconnections.
authors.forename: Bugeun
authors.initials: B
authors.lastname: Ki
authors.forename: Kyung Ho
authors.initials: KH
authors.lastname: Kim
authors.forename: Hyungjun
authors.initials: H
authors.lastname: Kim
authors.forename: Chulwon
authors.initials: C
authors.lastname: Lee
authors.forename: Yong-Hoon
authors.initials: YH
authors.lastname: Cho
authors.forename: Jungwoo
authors.initials: J
authors.lastname: Oh