Year: 2020
Type: article
Abstract: III-V semiconductor nanowires (NWs), such as those based on GaAs, are attractive for advanced optoelectronic and nanophotonic applications. The addition of Bi into GaAs offers a new avenue to enhance the near-infrared device performance and to add new functionalities, by utilizing the remarkable valence band structure and the giant bowing in the bandgap energy. Here, we report that alloying with Bi also induces the formation of optically-active self-assembled nanodisks caused by Bi segregation. They are located in the vicinity to the 112 corners of the GaAsBi shell and are restricted to twin planes. Furthermore, the Bi composition in the disks is found to correlate with their lateral thickness. The higher Bi composition in the disks with respect to the surrounding matrix provides a strong confinement for excitons along the NW axis, giving rise to narrow emission lines (<450 μeV) with the predominant emission polarization orthogonal to the NW axis. Our findings, therefore, open a new possibility to fabricate self-assembled quantum structures by combining advantages of dilute bismide alloys and lattice engineering in nanowires.
Source: Nanoscale
DOI: 10.1039/d0nr05488g
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Awards: Establishment of semiconductor-oxide composite nanowires and its application to photocatalyst, G193668846, G2156986825, G3312411, G4566879027, Optical, electronic, and spin engineering by semiconductor/oxide composite nanowires, G5559239973, Nanowires based on highly mismatched semiconductor alloys for nanophotonics, G821004061, G8674694503
OpenAlex ID: W3091783346