Sb‐Mediated Tuning of Growth‐ and Exciton Dynamics in Entirely Catalyst‐Free GaAsSb Nanowires

Author:

Jeong Hyowon W.1ORCID,Ajay Akhil1ORCID,Yu Haiting1,Döblinger Markus2,Mukhundhan Nitin1,Finley Jonathan J.1ORCID,Koblmüller Gregor1ORCID

Affiliation:

1. Walter Schottky Institute TUM School of Natural Sciences Technical University of Munich 85748 Garching bei München Germany

2. Department of Chemistry Ludwig‐Maximilians‐Universität München 81377 Munich Germany

Abstract

AbstractVapor‐liquid‐solid (VLS) growth is the mainstream method in realizing advanced semiconductor nanowires (NWs), as widely applied to many III‐V compounds. It is exclusively explored also for antimony (Sb) compounds, such as the relevant GaAsSb‐based NW materials, although morphological inhomogeneities, phase segregation, and limitations in the supersaturation due to Sb strongly inhibit their growth dynamics. Fundamental advances are now reported here via entirely catalyst‐free GaAsSb NWs, where particularly the Sb‐mediated effects on the NW growth dynamics and physical properties are investigated in this novel growth regime. Remarkably, depending on GaAsSb composition and nature of the growth surface, both surfactant and anti‐surfactant action is found, as seen by transitions between growth acceleration and deceleration characteristics. For threshold Sb‐contents up to 3–4%, adatom diffusion lengths are increased ≈sevenfold compared to Sb‐free GaAs NWs, evidencing the significant surfactant effect. Furthermore, microstructural analysis reveals unique Sb‐mediated transitions in compositional structure, as well as substantial reduction in twin defect density, ≈tenfold over only small compositional range (1.5–6% Sb), exhibiting much larger dynamics as found in VLS‐type GaAsSb NWs. The effect of such extended twin‐free domains is corroborated by ≈threefold increases in exciton lifetime (≈4.5 ns) due to enlarged electron‐hole pair separation in these phase‐pure NWs.

Funder

H2020 European Research Council

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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