Exciton dynamics in cation-exchanged CdSe/PbSe nanorods: The role of defects

Cation exchange occurs via defect initiated solid-state diffusion, a process that can lead to defect formations. The effect of such inherent defect formation on carrier dynamics of cation-exchanged heterostructures remains poorly understood. Herein, we report exciton dynamics in type II CdSe/PbSe heterostructure nanorods formed via cation exchange. The majority of electrons in CdSe domains decays in 5 ps due to ultrafast carrier trapping. The defect generated by cation exchange can be healed by annealing the as-synthesized CdSe/PbSe heterostructure nanorods. This study suggests a strategy for improving properties of heteronanostructures prepared by cation exchange for applications in photovoltaics and photocatalysis.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2017-09
Language
English
Keywords

NANOCRYSTAL QUANTUM DOTS; SEMICONDUCTOR NANOCRYSTALS; LOCALIZATION EFFICIENCY; CDSE/CDS NANORODS; SEEDED GROWTH; HETEROSTRUCTURES; ROD; ENERGY; PHOTOCATALYSIS; MORPHOLOGIES

Citation

CHEMICAL PHYSICS LETTERS, v.683, pp.342 - 346

ISSN
0009-2614
DOI
10.1016/j.cplett.2017.04.047
URI
http://hdl.handle.net/10203/225189
Appears in Collection
CBE-Journal Papers(저널논문)
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