Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 42, Pages 24165-24173Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b08040
Keywords
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Funding
- DST, India
- DAE-BRNS, India
- Council of Scientific and Industrial Research (CSIR), India
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Aside of size and shape, the strain induced by the mismatch of lattice parameters between core and shell in the nanocrystalline regime is an additional degree of freedom to engineer the electron energy levels. Herein, CdS/ZnS core/shell nanocrystals (NCs) with shell thickness up to four monolayers are studied. As a manifestation of strain, the low temperature radiative lifetime measurements indicate a reduction in Stokes shift from 36 meV for CdS to 5 meV for CdS/ZnS with four monolayers of overcoating. Concomitant crossover of S- and P-symmetric hole levels is observed which can be understood in the framework of theoretical calculations predicting flipping the hierarchy of ground hole state by the strain in CdS NCs. Furthermore, a nonmonotonic variation of higher energy levels in strained CdS NCs is discussed.
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