Observation of biexciton emission from single semiconductor nanoplatelets

Peng, Lintao; Cho, Wooje; Zhang, Xufeng; Talapin, Dmitri; Ma, Xuedan xuedan.ma@anl.gov

doi:10.1103/physrevmaterials.5.l051601

Title: Observation of biexciton emission from single semiconductor nanoplatelets

Journal Article · Tue May 04 00:00:00 EDT 2021 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.5.l051601· OSTI ID:1798303

Peng, Lintao ^[1]; Cho, Wooje ^[2]; Zhang, Xufeng ^[1]; Talapin, Dmitri ^[3];

^[4]

Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Chicago, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States); Northwestern Argonne Institute of Science and Engineering, Evanston, IL (United States)

Quasi-two-dimensional semiconductor nanoplatelets (NPLs) are intriguing systems for studying the influence of Auger recombination processes on the multiexciton emission efficiencies in the weak in-plane confinement regime. We investigate CdSe/CdS core/shell NPLs using cryogenic temperature single particle spectroscopy and observe bright biexciton emission at high excitation powers. The average binding energy of the biexcitons is determined to be 16.5 meV. The observed switching between the biexciton and trion states indicates charging-decharging dynamics of the NPLs mediated by the Auger ionization process. These findings are highly relevant for harvesting efficient biexciton emission for energy, lighting, and quantum applications.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF); Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1798303

Journal Information:: Physical Review Materials, Vol. 5, Issue 5; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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