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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.12: Poster

Monday, March 12, 2018, 17:30–19:30, Poster B

ultrafast Auger-mediated hole trapping and coherent phonon dynamics in CdSe/CdS core/shell colloidal semiconductor nanoplatelets — •shuo dong1,2, jie lian3, yinthai chan3,4, and zhiheng loh11Division of Chemistry and Biological Chemistry, and Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore — 2Fritz Haber Institut of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany — 3Institute of Materials Research & Engineering A*STAR, 3 Research Link, Singapore 117602, Singapore — 4Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore

The narrow absorption and photoluminescence emission spectra of atomically flat, quasi-two-dimensional, colloidal semiconductor nanoplatelets (NPLs), which originate from the atomically precise thickness, have motivated increasing research interest. Here, we report the use of ultrafast transient absorption spectroscopy to study the early-time carrier dynamics of CdSe/CdS core/shell NPLs. By selective monitoring the excitonic transitions, fluence-dependent measurements reveal a sub-picosecond Auger-mediated hole trapping process. The low-frequency oscillatory features observed in the first-moment time traces can be assigned to the hitherto undetected coherent acoustic phonons (5 and 20 cm-1). The elementary carrier and phonon dynamics of colloidal semiconductor NPLs observed herein could potentially influence their optoelectronic properties.

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