Open AccessSpectroscopy and Femtosecond Dynamics of Type-II CdSe/ZnTe Core−Shell Semiconductor Synthesized via the CdO Precursor
Author(s) -
Chun-Yen Chen,
Chiu-Ting Cheng,
Jen-Kan Yu,
Shih-Chieh Pu,
Yi Cheng,
PiTai Chou,
Yi-Hsuan Chou,
HsinTien Chiu
Publication year - 2004
Publication title -
the journal of physical chemistry b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 392
eISSN - 1520-6106
pISSN - 1520-5207
DOI - 10.1021/jp049177w
Subject(s) - femtosecond , quantum dot , materials science , semiconductor , photoinduced electron transfer , electron transfer , spectroscopy , photoinduced charge separation , core (optical fiber) , optoelectronics , analytical chemistry (journal) , photochemistry , chemistry , photocatalysis , optics , physics , laser , artificial photosynthesis , biochemistry , quantum mechanics , composite material , catalysis , chromatography
CdSe/ZnTe type-II quantum dots (QDs) synthesized via the CdO precursor are reported. Spectroscopic and femtosecond dynamic measurements reveal that the rate of photoinduced electron/hole spatial separation decreases with increases in the size of the core, and it is independent of the thickness of the shell in the CdSe/ZnTe QDs. The results are consistent with the binding strength of the electron and hole confined at the center of CdSe. The correlation between the core/shell size and the electron/hole spatial separation rate resolved in this study may provide valuable information for applications where rapid photoinduced carrier separation followed by charge transfer into a matrix or electrode is crucial, such as in photovoltaic devices.
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