She, C.
, Bryant, G.
, Demorti?, A.
, Shevchenko, E.
and Pelton, M.
(2013),
Controlling the spatial location of photoexcited electrons in semiconductor CdSe/CdS core/shell nanorods, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.87.155427, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910771
(Accessed March 4, 2025)
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Controlling the spatial location of photoexcited electrons in semiconductor CdSe/CdS core/shell nanorods
Published
Author(s)
Chunxing She, , Arnaud Demorti?, Elena V. Shevchenko, Matthew Pelton
Abstract
It is commonly assumed that, after an electron-hole pair is created in a semiconductor by absorption of a photon, the electron and hole rapidly relax to their respective lowest-energy states before recombining with one another. In semiconductor heterostructure nanocrystals, however, intraband relaxation can be inhibited to the point where recombination occurs primarily from an excited state. We demonstrate this using time-resolved optical measurements for CdSe/CdS core/shell nanorods. For nanorods with large CdSe cores, an electron photoexcited into the lowest-energy state in the core remains in the core, and an electron photoexcited into an excited state in the CdS shell remains in the shell, until the electron recombines with the hole.Citation
Physical Review B
Volume
87
Issue
15
Pub Type
Journals
Download Paper
Keywords
core-shell nanorods, quantum dots, tight-binding theory, transient absorption, emission
Citation
Issues
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Created April 21, 2013, Updated October 12, 2021