標題: Photoluminescence and time-resolved carrier dynamics in thiol-capped CdTe nanocrystals under high pressure
作者: Lin, Yan-Cheng
Chou, Wu-Ching
Susha, Andrei S.
Kershaw, Stephen V.
Rogach, Andrey L.
電子物理學系
Department of Electrophysics
公開日期: 2013
摘要: The application of static high pressure provides a method for precisely controlling and investigating many fundamental and unique properties of semiconductor nanocrystals (NCs). This study systematically investigates the high-pressure photoluminescence (PL) and time-resolved carrier dynamics of thiol-capped CdTe NCs of different sizes, at different concentrations, and in various stress environments. The zincblende-to-rocksalt phase transition in thiol-capped CdTe NCs is observed at a pressure far in excess of the bulk phase transition pressure. Additionally, the process of transformation depends strongly on NC size, and the phase transition pressure increases with NC size. These peculiar phenomena are attributed to the distinctive bonding of thiols to the NC surface. In a nonhydrostatic environment, considerable flattening of the PL energy of CdTe NC powder is observed above 3.0 GPa. Furthermore, asymmetric and double-peak PL emissions are obtained from a concentrated solution of CdTe NCs under hydrostatic pressure, implying the feasibility of pressure-induced interparticle coupling.
URI: http://hdl.handle.net/11536/21785
http://dx.doi.org/10.1039/c3nr33928a
ISSN: 2040-3364
DOI: 10.1039/c3nr33928a
期刊: NANOSCALE
Volume: 5
Issue: 8
起始頁: 3400
結束頁: 3405
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