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Optically detected magnetic resonance of thiol‐capped CdTe nanocrystals
Author(s) -
Glozman Alexander,
Lifshitz Efrat,
Hoppe Kathrin,
Rogach Ahdrey L.,
Weller Horst,
Echymüller Alexander
Publication year - 2001
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/gvft-60dt-8y0e-7dr9
Subject(s) - photoluminescence , chemistry , cadmium telluride photovoltaics , nanocrystal , vacancy defect , resonance (particle physics) , spectroscopy , shell (structure) , conduction band , chalcogen , optoelectronics , molecular physics , electron , nanotechnology , crystallography , atomic physics , materials science , physics , quantum mechanics , composite material
The optical properties of thiol‐stabilized CdTe nanocrystals have been examined. The thiol groups ‐SR generate a CdS shell at the interface, leading to a CdTe/CdS core—shell structure. The present paper describes our efforts to identify the influence of the CdTe–SR interface on the optical properties of the nanocrystals, utilizing photoluminescence and optically detected magnetic resonance (ODMR) spectroscopy. The photoluminescence spectrum consists of an excitonic peak, overlapped by a broad band at lower energies. The ODMR spectrum, in the spectral regime of the broad band, showed two resonance signals. They are associated with a trapped hole at an anisotropic site of a cadmium vacancy at the Cd–SR interface and an electron in the conduction band.