title: Structural and optical characterization of GaAs nano-crystals selectively grown on Si nano-tips by MOVPE.
abstract: We present the nanoheteroepitaxial growth of gallium arsenide (GaAs) on nano-patterned silicon (Si) (001) substrates fabricated using a CMOS technology compatible process. The selective growth of GaAs nano-crystals (NCs) was achieved at 570 °C by MOVPE. A detailed structure and defect characterization study of the grown nano-heterostructures was performed using scanning transmission electron microscopy, x-ray diffraction, micro-Raman, and micro-photoluminescence (μ-PL) spectroscopy. The results show single-crystalline, nearly relaxed GaAs NCs on top of slightly, by the SiO2-mask compressively strained Si nano-tips (NTs). Given the limited contact area, GaAs/Si nanostructures benefit from limited intermixing in contrast to planar GaAs films on Si. Even though a few growth defects (e.g. stacking faults, micro/nano-twins, etc) especially located at the GaAs/Si interface region were detected, the nanoheterostructures show intensive light emission, as investigated by μ-PL spectroscopy. Achieving well-ordered high quality GaAs NCs on Si NTs may provide opportunities for superior electronic, photonic, or photovoltaic device performances integrated on the silicon technology platform.
authors.affiliation: IHP, Im Technologiepark 25, D-15236 Frankfurt (Oder), Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Skibitzki
authors.forename: Ivan
authors.initials: I
authors.lastname: Prieto
authors.forename: Roksolana
authors.initials: R
authors.lastname: Kozak
authors.forename: Giovanni
authors.initials: G
authors.lastname: Capellini
authors.forename: Peter
authors.initials: P
authors.lastname: Zaumseil
authors.forename: Yadira
authors.initials: Y
authors.lastname: Arroyo Rojas Dasilva
authors.forename: Marta D
authors.initials: MD
authors.lastname: Rossell
authors.forename: Rolf
authors.initials: R
authors.lastname: Erni
authors.forename: Hans
authors.initials: H
authors.lastname: von Känel
authors.forename: Thomas
authors.initials: T
authors.lastname: Schroeder