Sub-Picosecond Carrier Dynamics Explored using Automated High-Throughput Studies of Doping Inhomogeneity within a Bayesian Framework

Summary, in English

Bottom–up production of semiconductor nanomaterials is often accompanied by inhomogeneity resulting in a spread in electronic properties which may be influenced by the nanoparticle geometry, crystal quality, stoichiometry, or doping. Using photoluminescence spectroscopy of a population of more than 11 000 individual zinc-doped gallium arsenide nanowires, inhomogeneity is revealed in, and correlation between doping and nanowire diameter by use of a Bayesian statistical approach. Recombination of hot-carriers is shown to be responsible for the photoluminescence lineshape; by exploiting lifetime variation across the population, hot-carrier dynamics is revealed at the sub-picosecond timescale showing interband electronic dynamics. High-throughput spectroscopy together with a Bayesian approach are shown to provide unique insight in an inhomogeneous nanomaterial population, and can reveal electronic dynamics otherwise requiring complex pump-probe experiments in highly non-equilibrium conditions.

• Author: Ruqaiya Al-Abri; Nawal Al Amairi; Stephen Church; Conor Byrne; Sudhakar Sivakumar; Alex Walton; Martin H. Magnusson; Patrick Parkinson
• Department/s: Solid State Physics; NanoLund: Centre for Nanoscience; LTH Profile Area: Nanoscience and Semiconductor Technology
• Publishing year: 2023
• Language: English
• Publication/Series: Small
• Volume: 19
• Issue: 33
• Links: http://dx.doi.org/10.1002/smll.202300053
• Document type: Journal article
• Publisher: John Wiley & Sons Inc.
• Topic: Condensed Matter Physics
• Keywords: Bayesian; high-throughput; nanowires; photoluminescence; split-off
• Status: Published
• ISBN/ISSN/Other: ISSN: 1613-6810