Synthesis of tetrahedral quasi-type-II CdSe-CdS core-shell quantum dots |
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Authors: | Sugunan Abhilash Zhao Yichen Mitra Somak Dong Lin Li Shanghua Popov Sergei Marcinkevicius Saulius Toprak Muhammet S Muhammed Mamoun |
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Affiliation: | Division of Functional Materials, Royal Institute of Technology (KTH), Stockholm, 16440, Sweden. |
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Abstract: | Synthesis of colloidal nanocrystals of II-VI semiconductor materials has been refined in recent decades and their size dependent optoelectronic properties have been well established. Here we report a facile synthesis of CdSe-CdS core-shell heterostructures using a two-step hot injection process. Red-shifts in absorption and photoluminescence spectra show that the obtained quantum dots have quasi-type-II alignment of energy levels. The obtained nanocrystals have a heterostructure with a large and highly faceted tetrahedral CdS shell grown epitaxially over a spherical CdSe core. The obtained morphology as well as high resolution electron microscopy confirms that the tetrahedral shell have a zinc blende crystal structure. A phenomenological mechanism for the growth and morphology of the nanocrystals is discussed. |
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