title: Silicon/organic hybrid heterojunction infrared photodetector operating in the telecom regime.
abstract: The authors report on the fabrication of a silicon/organic heterojunction based IR photodetector. It is demonstrated that an Al/p-Si/perylene-derivative/Al heterostructure exhibits a photovoltaic effect up to 2.7 μm (0.46 eV), a value significantly lower than the bandgap of either material. Although the devices are not optimized, at room temperature a rise time of 300 ns, a responsivity of ≈0.2 mA/W with a specific detectivity ofD∗≈ 7 × 107Jones at 1.55 μm is found. The achieved responsivity is two orders of magnitude higher compared to our previous efforts [1,2]. It will be outlined that the photocurrent originates from an absorption mechanism involving excitation of an electron from the Si valence band into the extended LUMO state in the perylene-derivative, with possible participation of intermediate localized surface state in the organic material. The non-invasive deposition of the organic interlayer onto the Si results in compatibility with the CMOS process, making the presented approach a potential alternative to all inorganic device concepts.
authors.affiliation: Institute for Semiconductor and Solid State Physics, Johannes Kepler University, Altenbergerstraße 69, 4040 Linz, Austria.
authors.forename: Mateusz
authors.initials: M
authors.lastname: Bednorz
authors.affiliation: Lehrstuhl für Werkstoffe der Elektronik- und Energietechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany.
authors.forename: Gebhard J
authors.initials: GJ
authors.lastname: Matt
authors.affiliation: Linz Institute for Organic Solar Cells (LIOS), Johannes Kepler University, Altenbergerstraße 69, 4040 Linz, Austria.
authors.forename: Eric D
authors.initials: ED
authors.lastname: Głowacki
authors.affiliation: Institute for Semiconductor and Solid State Physics, Johannes Kepler University, Altenbergerstraße 69, 4040 Linz, Austria.
authors.forename: Thomas
authors.initials: T
authors.lastname: Fromherz
authors.affiliation: Lehrstuhl für Werkstoffe der Elektronik- und Energietechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany.
authors.forename: Christoph J
authors.initials: CJ
authors.lastname: Brabec
authors.affiliation: Konarka Austria, Altenbergerstraße 69, 4040 Linz, Austria.
authors.forename: Markus C
authors.initials: MC
authors.lastname: Scharber
authors.affiliation: Institute for Semiconductor and Solid State Physics, Johannes Kepler University, Altenbergerstraße 69, 4040 Linz, Austria.
authors.forename: Helmut
authors.initials: H
authors.lastname: Sitter
authors.affiliation: Linz Institute for Organic Solar Cells (LIOS), Johannes Kepler University, Altenbergerstraße 69, 4040 Linz, Austria.
authors.forename: N Serdar
authors.initials: NS
authors.lastname: Sariciftci
keywords: Hybrid system; Infrared spectroscopy; Organic electronics; Photo-detector